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• How to diagnose Ubuntu CPU spikes / IO wait?

  - by Jeff Welling

  I'm using Ubuntu and every couple minutes it goes unresponsive for a half second to a full second, which isn't normally a problem but makes trying to code extremely frustrating when your trying to hit backspace or navigate the code and nothing is happening. The problem is, the freezes are so brief that top doesn't have time to show me what is spiking the CPU (assuming something is, but I don't know what else could cause this). Does anyone know how to troubleshoot this performance issue? Edit: I've tried login in with Gnome Classic (No Effects) instead of Unity but it still freezes up every once in awhile. Edit: The CPU graph doesn't seem to be showing any actual spikes so it seems you were right and my original diagnosis of CPU spikes being the problem was incorrect, I now suspect IO wait. I don't recall this happening for the brief few weeks I had Windows 7 Starter running on it though, which leads me to believe it isn't (just?) the hardware.. is there anything I can tweak to improve this? I'm using an Acer Aspire One D257, with Ubuntu 11.10. Edit: Output of dmesg is at http://paste.ubuntu.com/1060054/ and kern.log is at http://paste.ubuntu.com/1060055/

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• Battery is drained too quickly

  - by LucaB

  I'm getting really low battery life under ubuntu, not even close to windows. I tried powertop, and I saw that my laptop is consuming in idle nearly 20 watts (a bit more). I tried to install laptop-mode-tools, change "good" into "bad" in powertop, but nothing changes. I see that I have the the HD audio output device which is running at 100% every time. Could this be the problem? This is a report from powertop. The battery reports a discharge rate of 22.8 W The estimated remaining time is 33 minutes Summary: 381.8 wakeups/second, 0.0 GPU ops/second and 0.0 VFS ops/sec Usage Events/s Category Description 3.2 ms/s 182.7 Timer tick_sched_timer 100.0% Device Audio codec hwC0D3: Intel 7.9 ms/s 25.1 Process /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background no 1.9 ms/s 24.2 Interrupt [6] tasklet(softirq) 2.9 ms/s 23.2 Process /usr/lib/chromium-browser/chromium-browser --type=zygote 8.1 ms/s 20.3 Process /usr/lib/unity/unity-panel-service 0.7 ms/s 17.4 Timer hrtimer_wakeup 4.2 ms/s 12.6 Process unity-2d-panel 604.4 µs/s 9.7 Process syndaemon -i 2.0 -K -R -t 149.7 µs/s 9.7 kWork ieee80211_iface_work 0.8 ms/s 8.7 Process metacity 19.5 ms/s 1.0 Process powertop 3.0 ms/s 6.8 Process //bin/dbus-daemon --fork --print-pid 5 --print-address 7 --session 699.0 µs/s 6.8 Process /usr/lib/thunderbird/thunderbird 4.3 ms/s 4.8 Process gnome-terminal 658.9 µs/s 2.9 Interrupt [1] timer(softirq) 75.1 µs/s 2.9 kWork iwl_bg_run_time_calib_work 163.8 µs/s 1.9 Process /usr/lib/accountsservice/accounts-daemon 70.6 µs/s 1.9 Process [ksoftirqd/2] 25.8 µs/s 1.9 Process [ksoftirqd/0] 1.0 ms/s 1.0 Process /usr/bin/python /usr/sbin/powernapd 408.2 µs/s 1.0 Process unity-2d-shell 189.8 µs/s 1.0 Process /usr/lib/chromium-browser/chromium-browser 124.4 µs/s 1.0 Process /usr/lib/unity-lens-applications/unity-applications-daemon 113.3 µs/s 1.0 Process /usr/lib/gnome-settings-daemon/gnome-settings-daemon 112.0 µs/s 1.0 Process nautilus -n 104.9 µs/s 1.0 Process /usr/lib/gvfs/gvfsd-trash --spawner :1.2 /org/gtk/gvfs/exec_spaw/0 77.5 µs/s 1.0 Process /usr/lib/x86_64-linux-gnu/colord/colord 75.6 µs/s 1.0 Process /usr/lib/gvfs/gvfs-gdu-volume-monitor 75.0 µs/s 1.0 Interrupt [53] i915 74.9 µs/s 1.0 Process /usr/lib/gvfs/gvfs-afc-volume-monitor What should I do to make the battery consumption lower?

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• Disable static content caching in IIS 7

  - by Lee Richardson

  I'm a developer having what should be a relatively simple problem in IIS 7 on Windows Server 2008 R2. The problem is that IIS 7 is overzealously caching all static content on the server. It's caching all .html and .js content and not noticing when the content changes on disk unless I iisreset. I've tried the following: Deleting the local cache in my browser (I'm 99% positive this is a server caching issue) In IIS Admin in OutputCaching adding an .html extension and unchecking "User mode caching" and unchecking "Kernel-mode caching" In IIS Admin in OutputCaching adding an .html extension and checking "User mode caching" and selecting the radio for "Prevent all caching" In IIS Admin editing Output Cache Feature settings and unchecking "Enable cache" and "Enable kernel cache under OutputCaching. Running "C:\Windows\System32\inetsrv\config\appcmd set config "SharePoint - 80" -section: system.webServer/caching -enabled:false" Looking through applicationHost.config and disabling anything related to caching I could find. Nothing seems to work. I'm getting very frustrated. Can anyone please help?

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• SQL Server - Rebuilding Indexes

  - by Renso

  Goal: Rebuild indexes in SQL server. This can be done one at a time or with the example script below to rebuild all index for a specified table or for all tables in a given database. Why? The data in indexes gets fragmented over time. That means that as the index grows, the newly added rows to the index are physically stored in other sections of the allocated database storage space. Kind of like when you load your Christmas shopping into the trunk of your car and it is full you continue to load some on the back seat, in the same way some storage buffer is created for your index but once that runs out the data is then stored in other storage space and your data in your index is no longer stored in contiguous physical pages. To access the index the database manager has to "string together" disparate fragments to create the full-index and create one contiguous set of pages for that index. Defragmentation fixes that. What does the fragmentation affect?Depending of course on how large the table is and how fragmented the data is, can cause SQL Server to perform unnecessary data reads, slowing down SQL Server’s performance.Which index to rebuild?As a rule consider that when reorganize a table's clustered index, all other non-clustered indexes on that same table will automatically be rebuilt. A table can only have one clustered index.How to rebuild all the index for one table:The DBCC DBREINDEX command will not automatically rebuild all of the indexes on a given table in a databaseHow to rebuild all indexes for all tables in a given database:USE [myDB]    -- enter your database name hereDECLARE @tableName varchar(255)DECLARE TableCursor CURSOR FORSELECT table_name FROM information_schema.tablesWHERE table_type = 'base table'OPEN TableCursorFETCH NEXT FROM TableCursor INTO @tableNameWHILE @@FETCH_STATUS = 0BEGINDBCC DBREINDEX(@tableName,' ',90)     --a fill factor of 90%FETCH NEXT FROM TableCursor INTO @tableNameENDCLOSE TableCursorDEALLOCATE TableCursorWhat does this script do?Reindexes all indexes in all tables of the given database. Each index is filled with a fill factor of 90%. While the command DBCC DBREINDEX runs and rebuilds the indexes, that the table becomes unavailable for use by your users temporarily until the rebuild has completed, so don't do this during production  hours as it will create a shared lock on the tables, although it will allow for read-only uncommitted data reads; i.e.e SELECT.What is the fill factor?Is the percentage of space on each index page for storing data when the index is created or rebuilt. It replaces the fill factor when the index was created, becoming the new default for the index and for any other nonclustered indexes rebuilt because a clustered index is rebuilt. When fillfactor is 0, DBCC DBREINDEX uses the fill factor value last specified for the index. This value is stored in the sys.indexes catalog view. If fillfactor is specified, table_name and index_name must be specified. If fillfactor is not specified, the default fill factor, 100, is used.How do I determine the level of fragmentation?Run the DBCC SHOWCONTIG command. However this requires you to specify the ID of both the table and index being. To make it a lot easier by only requiring you to specify the table name and/or index you can run this script:DECLARE@ID int,@IndexID int,@IndexName varchar(128)--Specify the table and index namesSELECT @IndexName = ‘index_name’    --name of the indexSET @ID = OBJECT_ID(‘table_name’)  -- name of the tableSELECT @IndexID = IndIDFROM sysindexesWHERE id = @ID AND name = @IndexName--Show the level of fragmentationDBCC SHOWCONTIG (@id, @IndexID)Here is an example:DBCC SHOWCONTIG scanning 'Tickets' table...Table: 'Tickets' (1829581556); index ID: 1, database ID: 13TABLE level scan performed.- Pages Scanned................................: 915- Extents Scanned..............................: 119- Extent Switches..............................: 281- Avg. Pages per Extent........................: 7.7- Scan Density [Best Count:Actual Count].......: 40.78% [115:282]- Logical Scan Fragmentation ..................: 16.28%- Extent Scan Fragmentation ...................: 99.16%- Avg. Bytes Free per Page.....................: 2457.0- Avg. Page Density (full).....................: 69.64%DBCC execution completed. If DBCC printed error messages, contact your system administrator.What's important here?The Scan Density; Ideally it should be 100%. As time goes by it drops as fragmentation occurs. When the level drops below 75%, you should consider re-indexing.Here are the results of the same table and clustered index after running the script:DBCC SHOWCONTIG scanning 'Tickets' table...Table: 'Tickets' (1829581556); index ID: 1, database ID: 13TABLE level scan performed.- Pages Scanned................................: 692- Extents Scanned..............................: 87- Extent Switches..............................: 86- Avg. Pages per Extent........................: 8.0- Scan Density [Best Count:Actual Count].......: 100.00% [87:87]- Logical Scan Fragmentation ..................: 0.00%- Extent Scan Fragmentation ...................: 22.99%- Avg. Bytes Free per Page.....................: 639.8- Avg. Page Density (full).....................: 92.10%DBCC execution completed. If DBCC printed error messages, contact your system administrator.What's different?The Scan Density has increased from 40.78% to 100%; no fragmentation on the clustered index. Note that since we rebuilt the clustered index, all other index were also rebuilt.

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• TTL and traceroute showing different values for same domain

  - by Cray XT3

  y am i getting two different output for tracert and ping. Ping Result showing total hops of 20 and tracert showing 8. default ttl value on my linux machine 64,icmp echo reply ttl value 44. 64-44=20 but tracert is showing only 8 hops. What can be the reason? If tracert is implemented using ttl then why am i getting different values for same domain.no matter how many times i tried. Fo google and google services,ttl value and tracrt are same,but for other domains its different.

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• System speakers not recognized

  - by Kyle Maxwell

  Since upgrading to Xubuntu 13.10, sound has not functioned properly (e.g. screeching when playing Skype notifications). Now, however, it does not function at all. pavucontrol only shows Dummy Output and does not recognize the built-in speakers on my Dell Precision M4600. Possibly related, the sound indicator applet does not come up when I click on it, only showing a small white bar underneath it. I have purged and reinstalled pulseaudio. lspci -v shows: 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04) Subsystem: Dell Precision M4600 Flags: bus master, fast devsel, latency 0, IRQ 56 Memory at f2560000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: snd_hda_intel 01:00.1 Audio device: NVIDIA Corporation GF106 High Definition Audio Controller (rev a1) Subsystem: Dell Device 14a3 Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at f0080000 (32-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: snd_hda_intel The "Capabilities: <access denied" line makes me wonder if there's a permissions issue, as the Log Out applet now shows "Restart" and "Shutdown" grayed out. groups shows me in: kmaxwell adm dialout cdrom sudo dip plugdev fuse lpadmin netdev sambashare vboxusers

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• Increasing Screen Resolution to more than limit and scaling to origional

  - by Akshat Mittal

  I have a laptop, with Screen Resolution - 1366x768 (most common) - I want to increase it further to 1600x900 (or higher), in the same ratio. I want to scale the higher resolution on my current screen to fit it. I found xrandr with command xrandr --output LVDS1 --scale 1.4x1.4, this worked but again resulted to another problem, it does the scaling thing but the cursor is still blocked into the native screen resolution and I am not able to move it further, I found that the bug is already filed here. Also this command was only for Linux, I wanted to do this thing with both Linux and Windows (including Windows 8). I want a similar software that is bug free (at least not a major bug like this) and that supports Windows as well (or two separate software for Windows and Linux). Any help is appreciated and Thanks in advance.

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• Nohup & Sass: Process keeps running but, after a while, *.scss files do not get compiled

  - by maurits

  I am using Sass on a CentOS 5.8 server and want it to keep running after SSH logout, so that other users can edit *.scss files for days or even weeks to come without any need to start the program each time they login (in fact, they don't even have SSH access). I have used the following command from this question/answer: $ nohup sass --watch path/to/scss/files:path/to/css/output/files & Then, I log out of the SSH session and the process keeps running. It all works fine (logging in again and using touch to create a test file (test.scss) correctly triggers the creation of the corresponding test.css file) for the first few minutes, but after a while the *.scss files stop getting compiled... However, ps aux | grep 'sass' Shows that the process is still running. Anybody knows what am I doing wrong?

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• Share history in multiple zsh shell

  - by michael

  I am trying to setup zsh so that it shares command history between different zsh sessions: in multiple tabs in multiple gnome-terminals in different screen sessions I have put this in .zshrc #To save every command before it is executed (this is different from bash's history -a solution): setopt inc_append_history #To retrieve the history file everytime history is called upon. setopt share_history but that does not work. e.g. I type 1 command: gedit afile and then I go to and zsh and type history. I don't see gedit afile. output of 'setopt' is % setopt nohistbeep histexpiredupsfirst histfindnodups histignorealldups histignoredups histignorespace histnostore histreduceblanks histsavenodups histverify incappendhistory interactive monitor promptsubst sharehistory shinstdin zle How can I achieve this?

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• Website: Requested filename being rewritten

  - by horatio

  I have been unable to find an answer via search. I have a website (I do not administer the servers) where the server will serve a different file than the one requested. I first noticed this when using a filename of the following form: _foo.php (single underscore) If I request foo.php (does not exist), the server returns _foo.php. By "returns" I mean that the server decides I meant _foo.php, processes the php file, and serves the output. If I request afoo.php, zfoo.php, or even __foo.php (two underscores) (these files do not exist) the server returns _foo.php. If I request aafoo.php, the server returns 404. To sum up: the server seems to be doing a partial filename match. My question is: what is happening and is this accepted behavior for a web server (or standard behavior of a common mod/package/etc)?

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• yum list installed including version of all installed packages CentOS 5.4

  - by Andy

  I have a list of packages installed with yum on CentOS 5.4 [root@server ~]# yum list installed ... Installed Packages GConf2.x86_64 2.14.0-9.el5 installed ImageMagick.x86_64 6.2.8.0-4.el5_1.1 installed MAKEDEV.x86_64 3.23-1.2 installed MySQL-python.x86_64 1.2.1-1 installed I would like to download these rpms locally using yumdownloader --resolve MySQL-python-1.2.1-1.x86_64 etc. However the package formatting is different (MySQL-python.x86_64 1.2.1-1 vs MySQL-python-1.2.1-1.x86_64) so I am unable to download them using the above command. I don't want to have to parse the output of yum list installed, and I also don't want to use the contents of /var/log/yum.log* as I'll have to account for erased packages and version discrepancies. However /var/log/yum.log* does have the formatting I require... May 25 14:58:15 Installed: groff-1.18.1.1-11.1.x86_64 May 25 14:58:15 Installed: bzip2-1.0.3-4.el5_2.x86_64 Any suggestions?

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• Difficulty Mounting Volumes on a Partitioned External HD

  - by Todd

  I'm having a great deal of difficulty with an external hard drive. I'm currently running a dual boot system (XP Service Pack 3 and Ubuntu 11.04 Natty Narwahl) on a Dell Inspiron B120. I'm trying to set up a new 80 GB Hitachi external HD. Using GParted, I formatted the drive and set up the partitions. The partitioning scheme is as follows 10GB NTFS Primary, 2GB Linux-Swap Primary, 50GB FAT32 Primary, 12GB Unallocated. After applying those changes, I went into Disk Utility and the HD appears along with the correct partitions. When I try to mount the volumes for partitions 1 and 3, I get a pop-up stating: Error Mounting Volume An error occurred while performing an operation on "Home" (Partition 3 of HTS548080m9AT00): The daemon is being inhibited. When I try to to check the filesystem I get a pop-up stating: Error Checking filesystem on volume An error occurred while performing an operation on "Home" (Partition 3 of HTS548080m9AT00): The daemon is being inhibited. Throughout the time that I'm attempting to troubleshoot the problem, the external drive light is on and blinking. With my frustration hitting a boiling point, I try to shut down the drive and remove it so that I can plug in a different external HD that works PERFECTLY. However, when I try to shut down and safely remove the drive, I get a pop-up stating: Error Detaching Drive An error occurred while performing an operation on "80GB Hard Disk" (HTS548080m9AT00): The daemon is being inhibited. Can anyone tell me what I'm doing wrong? I'm a newbie and not that skilled with terminal commands, so please dumb it down for me if you request specific command output.

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• How to stop IIS7 from listening on a specific IP address and port?

  - by webworm

  I am trying to install Apache on Windows Server 2008. The installation ends with a warning that the IP address I configured Apache to listen on cannot be bound. When I use netstat -a -p tcp to see if any processes are listening on the IP address and port I see several entires .. one of which shows as listening on 0.0.0.0:80. Here is a partial list of the output. Proto Local Address Foreign Address State TCP 0.0.0.0:80 MYSERVERNAME:0 LISTENING This looks to be IIS7 listening on all IP addresses on port 80. The confusing thing is that I stopped IIS7. All websites are shown as stopped. I tried iisreset /STOP as well as using the IIS7 Manager, yet something is still listening on 0.0.0.0:80. I have even made sure that every web site is bound to another IP address other than the one I want freed for Apache. Has anyone else run into this?

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• adding remote ssh printer as local printer

  - by guest

  I have SSH access to a remote host (FreeBSD) that has a printer set up. I do not have root access on that host or any other special user rights. Now I want to print directly from my laptop on that printer (Ubuntu 10.10). The problem is that I don't know how to "import" or whatever the the printer, as it needs authetification from my user account (print quota limitations). E-mailing me the files I want to print or scp them every time is a pain, ATM I pipe the PostScript output manually to a ssh command, but that's also a huge working overhead. E.g. when I want to print a foo.pdf pdftops '/path/to/foo.pdf' - | ssh user@remotehost 'lpr -P printername' So, does anyone know of a smooth way to shorten this procedure? Ideally I would just want to use a printername instead of the whole ssh command

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• Git and Amazon EC2 public key denied

  - by MrNart

  I had git working before on /var/html/projectfolder and realized it was a security risk so I made a new folder /projects from the root folder and tried to replicate what I did and now it doesnt work. Here is the backlog of what I did for my local machine and EC2 - server Server-EC2 1.I added my public key to the authorized_user file in ~/.ssh folder 2.Create a bare repository git init --bare 3.Change folder permissions to sudo chgrp -R ec2-user * sudo chmod -R g+ws * Local Machine create a local repository with git init touch, add, commit readme file pointed origin master to ec2 via git remote add origin ssh://ec2-user@remote-ip/path/to/folder This is my output: Permission Denied (publickey) fatal: The remote end hung up unexpectedly

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• What do encrypted files' data look like?

  - by Frost Shadow

  I know there are a lot of encryption programs available, that I would guess use different methods for encryption, and thus have different types of output files (.fve .tc .cha .dmg (bitlocker, truecrypt, challenger, ect.)), but if someone didn't know what the file was and just looked at the data, what would it look like? Does it just look like random bits, or can you still pick out a pattern? If it does look random, how is it if I moved the encrypted file to another computer, the other computer can tell it's a file, and is able to decrypt it (how would it even know where to start or stop, if it all looked random)? Also, how is the structure affected by encrypting files twice, using the same method, or a different one? Thanks for any help, and if you know any books or site about encryption for complete idiots, I'd appreciate it!

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• Problem Installing Ubuntu 12.04 - [Errno 5]

  - by Rob Barker

  I'm trying to intall Ubuntu 12.04 to my brand new eBay purchased hard drive. Only got the drive today and already it's causing me problems. The seller is a proper proffesional company with 99.9% positive feedback, so it seems unlikely they would have sold me something rubbish. My old hard drive packed up last Tuesday and so i bought a new one to replace it. Because this was an entirely new drive i decided to install Ubuntu as there was no current operating system. My computer is an eMachines EM250 netbook. There's no disc drive so i am installing from a USB stick. The new operating system loads beautifully, and the desktop appears just as it should. When i click install i am taken to the installer which copies the files to about 35% and then displays this: [Errno 5] Input/output error This is often due to a faulty CD/DVD disk or drive, or a faulty hard disk. It may help to clean the CD/DVD, to burn the CD/DVD at a lower speed, to clean the CD/DVD drive lens (cleaning kits are often available from electronics suppliers), to check whether the hard disk is old and in need of replacement, or to move the system to a cooler environment. The hard drive can be heard constantly crackling. When i booted Ubuntu 12.04 from my old faulty hard drive as a test, i didn't even make it past the purple Ubuntu screen, so it can't be that bad. Any ideas? Message to the moderators. Please do not close this thread. I'm well aware there may be other threads on this, but i don't want it closing as the others do not provide the answer i am looking for. Thank you.

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• Sound problems in Windows 7

  - by Plastkort

  hi! I hope I reached the correct forum for this question. I have a media computer with a third party audio card (Soundblaster audigy SE) I use a coaxial digital audio cable connected to a Onkyo TX SR508. if I use normal audio, the sound seems very low, I have to set volume atleast to 62 in my amplifier to hear anything, however if I set digital SPDIF I have no means of controlling the audio volume from the PC (only from the amplifier) and this can be nasty if I toggle between movies that uses Digital AC3/THX and movies wihtouth, if I look at movies capable of AC3 the volume gets VERY loud if amp is set to 62, 32 is more than enough volume when using passthrough. so this bothers me is how can I get the same amount of volume with or without digital output? I tried also other soundcards, internal red light Digital audio cable... if I connect to my television I get ok sound on any sound source via HDMI... help :)

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• Methodology To Determine Cause Of User Specific Error

  - by user3163629

  We have software that for certain clients fails to download a file. The software is developed in Python and compiled into an Windows Executable. The cause of the error is still unknown but we have established that the client has an active internet connection. We suspect that the cause is due to the clients network setup. This error cannot be replicated in house. What technique or methodology should be applied to this kind of specific error that cannot be replicated in house. The end goal is to determine the cause of this error so we can move onto the solution. For example; Remote Debugging: Produce a debug version of the software and ask the client to send back a debug output file. This involves alot of time (back and forth communication) and requires the client to work and act in a timely manor to be successful. In-house debugging: Visit the client and determine their network setup, etc. Possibly develop a series of script tests before hand to run on the clients computer under the same network. Other methodologies and techniques I am not aware of?

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• Problems with Intel Video Resolution on Acer Laptop Wide Display

  - by ricstr

  I have an ACER Aspire 5332 laptop which I have just installed Ubuntu 12.04 x64, which is causing some issues with the video display on boot and video resolution. First and foremost, it will only boot past the purple screen if GRUB has been edited to replace 'quick splash' with 'nomodeset'. Secondly, once it has booted with the the 'nomodeset' option, it does not allow me to change the resolution higher or lower from 1024 x 786. Is it OK to use the 'nomodeset' for normal use? Will this compromise performance of other devices? The video card is an on-board one, integrated within the Intel GL40 chip-set. The display is a wide-screen LCD, and under Windows could operate under various resolutions. Ideally I would like it to operate on a resolution to fit the wide-screen display as it a bit stretched out at the moment, and less desktop space as I am used to. I believe the optimal resolution is 1366 x 768. Below is some information from the terminal which may be useful. ricstr@Aspire-5332:~$ lspci | grep -i VGA 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09) ricstr@Aspire-5332:~$ xrandr xrandr: Failed to get size of gamma for output default Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768 default connected 1024x768+0+0 0mm x 0mm 1024x768 0.0*

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• 11.10 liveCD black screen

  - by Shaun Killingbeck

  Attempting to install/try ubuntu 11.10 on my new laptop, using a liveCD (and tried USB). I get the purple screen (with the man/keyboard at the bottom) and after that the screen flashes bright white before going black. Ubuntu continues to load in the background, with login sound etc but the screen is off. I have tried as many different solutions as I could find including: using nomodestep, xforcevesa, i915.modeset=0 in boot options (seperately): varying consequences, but either I end up at a blinking cursor with no prompt, a command line (startx fails: no screen found), or the original blank screen again Tried booting from VirtualBox - it crashes at the same place the screen would go blank when using a CD/USB tried 11.04: I don't have this problem BUT when trying to install, I get a ubi-partman error 141 (possibly down to the three partitions that came on my laptop... not sure why HP needed there own separate partition for HP Tools...) Model: HP Pavillion DV6 6B08SA Processor: AMD Quad-Core A6-3410MX APU with Radeon HD 6545G2 Dual Graphics (1.6 GHZ 4 MB L2 cache ) Chipset: AMD RS880M Any help would be greatly appreciated. I just want to be able to partition the drive and install Ubuntu. I'm assuming the issue is graphics card related, although I have no confirmation of that. I have caught a glimpse of some output to do with pulseaudio and [fail], but I can't imagine why that would cause a screen problem and the sound definitely works anyway.

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• Dual External Monitors Through Docking Station on ASUS G73JW-XT1

  - by user60695

  I am getting an ASUS G73JW-XT1; and I would like to set it up so that I can plug it into a docking station at my desk, and use 2 external monitors (not the laptop display and an additional monitor). The computer supports a DVI and HDMI output, but I cannot find any docking stations that will support two external displays, as well as audio ports and USB ports for other peripherals. Does anybody know of a specific docking station that will do this, or another workaround without having to plug in several things to my laptop every time I bring it to my desk?

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• Sharing an internet connection through the Ethernet port

  - by Bob Cunningham

  I have a small living room PC (Bohica, running fully-updated Ubuntu 10.10/Maverick) connected to my HDTV that I use for web browsing and media streaming. It connects via WiFi (wlan0) to my Fedora server (Snafu) that in turn connects to the internet. I use static addressing, and everything has been working fine. I just got a Blu-ray player, and I'd like to give it wired network access to the internet via Bohica's available wired ethernet port (eth0). So far, I haven't been to get eth0 and the network configured to get the Blu-ray player talking to the internet. Here's my wlan0 configuration: ip4 addr: 192.168.0.100 mask: /24 (255.255.255.0) gateway: 192.168.0.4 (fedora box) The Blu-ray player is set to an IP of 192.168.0.98/24, with the same gateway as above. I want eth0 set to an IP of 192.168.0.99/24, but when I do this using nm-connection-editor I lose internet access (the system tries to use eth0 as the default internet access interface). How do I get my blu-ray player to talk to the internet through Bohica, and do so without disrupting my current (working) network? Thanks. Edit: Here's the relevant output from nm-tool with the Blu-ray player connected: $ nm-tool NetworkManager Tool State: connected - Device: eth0 Type: Wired Driver: forcedeth State: disconnected Default: no HW Address: 90:FB:A6:2C:94:32 Capabilities: Carrier Detect: yes Speed: 100 Mb/s Wired Properties Carrier: on - Device: wlan0 [wlan0] Type: 802.11 WiFi Driver: ndiswrapper State: connected Default: yes HW Address: 00:26:5A:C0:D0:05 IPv4 Settings: Address: 192.168.0.100 Prefix: 24 (255.255.255.0) Gateway: 192.168.0.4

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• The cd command using variable to mapped NFS volume within ssh in linux script is not working

  - by Bhavya Maheshwari

  I have to do the following from within a bash script. The /VMNFS/ folder is present on linux box, from where script is run, and is mapped to the machine into which i am ssh'ing, as an NFS at /vmfs/volumes/VMNFS/. The second cd command doesn't work, neither with symbolic path name nor physical pathname. Why? and How to rectify this? #!/bin/bash ssh -2 [email protected] /bin/sh <<\EOF vmfile_path=`grep / vmvar_file` datastore_path=/vmfs/volumes/VMNFS/ cd $datastore_path && echo "The present working directory is" `pwd -P` esxi_vmfile_path_sub=`pwd -P` && echo "variable value is" $esxi_vmfile_path_sub esxi_vmfile_path=`echo $vmfile_path | sed "s:/VMNFS:$esxi_vmfile_path_sub:"` cd "$esxi_vmfile_path" EOF ***Output***: The current working directory is /vmfs/volumes/65335ec4-46d12e41 variable value is /vmfs/volumes/65335ec4-46d12e41 can't cd to /vmfs/volumes/65335ec4-46d12e41/TPAE7.5/

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• Design for an interface implementation that provides additional functionality

  - by Limbo Exile

  There is a design problem that I came upon while implementing an interface: Let's say there is a Device interface that promises to provide functionalities PerformA() and GetB(). This interface will be implemented for multiple models of a device. What happens if one model has an additional functionality CheckC() which doesn't have equivalents in other implementations? I came up with different solutions, none of which seems to comply with interface design guidelines: To add CheckC() method to the interface and leave one of its implementations empty: interface ISomeDevice { void PerformA(); int GetB(); bool CheckC(); } class DeviceModel1 : ISomeDevice { public void PerformA() { // do stuff } public int GetB() { return 1; } public bool CheckC() { bool res; // assign res a value based on some validation return res; } } class DeviceModel2 : ISomeDevice { public void PerformA() { // do stuff } public int GetB() { return 1; } public bool CheckC() { return true; // without checking anything } } This solution seems incorrect as a class implements an interface without truly implementing all the demanded methods. To leave out CheckC() method from the interface and to use explicit cast in order to call it: interface ISomeDevice { void PerformA(); int GetB(); } class DeviceModel1 : ISomeDevice { public void PerformA() { // do stuff } public int GetB() { return 1; } public bool CheckC() { bool res; // assign res a value based on some validation return res; } } class DeviceModel2 : ISomeDevice { public void PerformA() { // do stuff } public int GetB() { return 1; } } class DeviceManager { private ISomeDevice myDevice; public void ManageDevice(bool newDeviceModel) { myDevice = (newDeviceModel) ? new DeviceModel1() : new DeviceModel2(); myDevice.PerformA(); int b = myDevice.GetB(); if (newDeviceModel) { DeviceModel1 newDevice = myDevice as DeviceModel1; bool c = newDevice.CheckC(); } } } This solution seems to make the interface inconsistent. For the device that supports CheckC(): to add the logic of CheckC() into the logic of another method that is present in the interface. This solution is not always possible. So, what is the correct design to be used in such cases? Maybe creating an interface should be abandoned altogether in favor of another design?

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