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• Can i create a virtual machine on my laptop to be used with another monitor?

  - by Ranhiru

  OK, the scenario is like this... I have my laptop... and I have another user without a unit. He has only a keyboard, mouse and a monitor. Is there anyway that I can make him use my computer by creating a virtual environment which he will access, BUT, without interfering with my work. I use my laptop and view my OS from the laptop monitor. I create a virtual environment (some OS probably XP) and run it. The virtual environment is displayed in the connected monitor and the other user uses it using the extra keyboard/mouse and the monitor but without interfering my screen! Is this possible? Stupid? Futuristic? Need more hardware?

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• Configuration tools for multiple monitors for X / Linux

  - by richard

  I have Ubuntu 10.04 running gnome and two monitors. I am wondering if a can get a better multi-monitor configuration tool. The one I have, gnome-display-properties, has too many problems, including: when I swapped my monitors over, the narrower one now on the left. There is a width calculation error, such that I have a virtual monitor the width of the wide-monitor on the narrow-monitor and part of the wide monitor. And a virtual narrow-monitor on the remainder of the wide-monitor. I would like: nobugs. to be able to select which is primary monitor. to have multiple configurations. configurations to be automatically selected based on which monitors are attached. configurations to be cycled (reliably) when display mode key is pressed. when a display is deactivated, for windows to migrate to remaining monitors. option to not change display resolution when mirroring, but to use side/top blanking bars to pad out screen.

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• Grub: Legacy 'ask' parameter no longer supported

  - by leeand00

  I'm trying to change the resolution on my base shell (the Ctrl+Alt+1) shell in Debian so that it supports my ViewSonic monitor. The shell appears really fuzzy when it is displayed on my lcd monitor, but GRUB looks fine when it's displayed. In I tried changing part of the GRUB_CMDLINE_LINUX_DEFAULT to 'vga=ask', and now I get the error on booting up 'Legacy 'ask' parameter no longer supported' Has this 'vga=ask' value been changed to something else? Note, I tried setting it to 'vga=782' after finding a list of screen modes here and the shell font got real huge for a few seconds during boot up, and then switched back to it's awful fuzzy self again, when I went to use the Debian Bash shell. UPDATE Tried suggestion in this question, it works without fuzziness until the last resolution change which displays the user login to the shell.

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• Windows 7 MCE client server HTPC

  - by Dan Hook

  My HTPC is downstairs connected to my large screen. I would like to use my desktop upstairs to record over the air HDTV and stream it to the HTPC. I have Windows 7 Professional installed on the desktop. I currently have XP on the HTPC, but I'm going to upgrade it to Windows 7. Is there a particular flavor of Win 7 I should use? Is it possible to record on the desktop and use Windows MCE on the HTPC to watch the recorded content? What about live TV? The consensus I've seen is that Windows 7 cannot be configured as a Windows Media Center Extender. Is that the case? If so, what's the cheapest solution for an extender?

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• Google+ Platform Office Hours for May 16th, 2012: Hangouts API v1.1

  Google+ Platform Office Hours for May 16th, 2012: Hangouts API v1.1 This week we discussed the latest release of the Hangouts API, v1.1. JD Salazar and Richard Dunn from the Hangouts API engineering team joined us to help your answer questions. Discussion this session on Google+: goo.gl You can learn more about our office hours here: goo.gl 0:29 - Introductions 2:50 - Richard gives us an overview of what's new in Hangouts API v1.1 8:57 - What are the default scales for the static overlays? 9:25 - Will the static overlay scale ratio change during the hangout? 10:13 - What is the resolution of the feed? How do I ensure my overlays match the quality? 12:49 - How do I know if an image resource has failed to load? 16:33 - Can we have animated gifs as overlays? 19:44 - Loaded overlays do not clear upon deletion. How many can I load before I encounter issues? 21:48 - Are sound overlays played to all participants or only locally? What about sound cancellation? 23:27 - How do you uninstall a Hangout app? 25:41 - Can I make an app that uses drag and drop onto the film strip? 26:55 - Can we embed participant thumbnails elsewhere on the screen? 28:33 - How can I determine a consistent ordering for hangout participants? 31:35 - Can I access Picasa photos uploaded by another user within a hangout? Gerwin demonstrates his solution. 31:14 - How do I know when my hangout app has been unloaded for the purposes of doing cleanup? 39:28 - Will face tracking ever support multiple faces? 40:41 - Can I use WebGL in a hangouts app? 42:09 - I'm having issues with <b>...</b> From: GoogleDevelopers Views: 2032 18 ratings Time: 53:05 More in Science & Technology

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• Managing many draw calls for dynamic objects

  - by codetiger

  We are developing a game (cross-platform) using Irrlicht. The game has many (around 200 - 500) dynamic objects flying around during the game. Most of these objects are static mesh and build from 20 - 50 unique Meshes. We created seperate scenenodes for each object and referring its mesh instance. But the output was very much unexpected. Menu screen: (150 tris - Just to show you the full speed rendering performance of 2 test computers) a) NVidia Quadro FX 3800 with 1GB: 1600 FPS DirectX and 2600 FPS on OpenGL b) Mac Mini with Geforce 9400M 256mb: 260 FPS in OpenGL Now inside the game in a test level: (160 dynamic objects counting around 10K tris): a) NVidia Quadro FX 3800 with 1GB: 45 FPS DirectX and 50 FPS on OpenGL b) Mac Mini with Geforce 9400M 256mb: 45 FPS in OpenGL Obviously we don't have the option of mesh batch rendering as most of the objects are dynamic. And the one big static terrain is already in single mesh buffer. To add more information, we use one 2048 png for texture for most of the dynamic objects. And our collision detection hardly and other calculations hardly make any impact on FPS. So we understood its the draw calls we make that eats up all FPS. Is there a way we can optimize the rendering, or are we missing something?

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• Run remotly, in the background, using ssh, then log-out, keep process running, how? - Simply pls :-)

  - by user1611107

  The following question has been asked millions of times (be patient towards it please :-)).. Why O why - can't I find ONE SIMPLE, CONCLUSIVE answer? - Would be highly appreciated! Is running a program (What_ever_job.EXE file) in ssh as : "./What_ever_job &" enough to keep it running if my own computer is shut down and ssh is closed? If not - what is the PRECISE (Please!...) way to run it? No "Screen" please, I have seen something called "nohup" (?) - how do I write the commend? Thanking you a lot on advance, Erez.

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• How much power supply do I need for my server, and could a shortage be causing my odd crashing?

  - by dolan

  I have 5 servers, all with similar hardware (i7, four 2tb 7200rpm drives, two 4tb 5400rpm drives, 430 watt power supply), and lately the machines have been freezing up. This has gotten worse in the last day or so, and I can't pinpoint any explanation. One recent change was adding the two 4tb hard drives. The crashes happen most often while running a large Hadoop job, so I was originally thinking the load was causing some issues, but last night one server just froze without any heavy load on the box (or so I think), other than HDFS (Hadoop's distributed file system) was probably rebalancing itself since two of the five nodes were offline. If I plugin a monitor and keyboard to one of these frozen machines, I can't get any response or feedback on the screen. Any ideas on possible points of failure and/or different logs I can look at to investigate? Thanks Edit: The systems are running Ubuntu 10.04 Edit 2: More on hardware: intel core i7-930 bloomfield 2.8ghz processor (quad core) 12gb (6 x 2gb) kingston ddr3 1333 ram antec earthwatts green 430 power supply msi x58m lga 1366 motherboard

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• How do I add more than one command to /etc/rc.local?

  - by Andreas

  I want to add two power saving commands to /etc/rc.local file. This to dissable bluetooth: rfkill block bluetooth And this to reduce screen brightness: echo 3024 > /sys/class/backlight/intel_backlight/brightness Separately added to /etc/rc.local they work but not both of them together like this: #/bin/sh -e # # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will "exit 0" on success or any other # value on error. # # In order to enable or disable this script just change the execution # bits. # # By default this script does nothing. echo 3024 > /sys/class/backlight/intel_backlight/brightness rfkill block bluetooth exit 0 How do I add the two commands to get them properly executed at start-up? Update It turned out to be a timing issue. I fixed it by delaying the execution of the first command thus: (sleep 5; echo 3021 > /sys/class/backlight/intel_backlight/brightness)&

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• Windows 7 on 1st Gen Macbook Pro (Q4-2008), power management problems.

  - by typemismatch

  I have the first generation macbook pro, purchased Q4 2008. I've been trying to run Windows 7 and can get it all installed great with the BootCamp 3.1 64 bit drivers however ... power management isn't great. The screen and keyboard don't automatically dim - the laptop gets too hot. I noticed on some newer macbook pros that windows 7 works perfectly and the above doesn't happen. Does anyone know if there really is a hardware issue with this 1st gen or is there some firmware update I can use to fix this? Thanks!

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• Volume display for laptop missing after driver update

  - by Cyclone

  I have a Dell Inspiron 1520, and I just updated my audio drivers to be able to use Stereo Mix. It's a SigmaTel audio driver. Prior to the update, whenever I used the hardware buttons to update volume or mute/unmute speakers, it would always have a nice display like this one: But, for volume instead of screen brightness. The hardware buttons still work fortunately, but the volume display is gone. Is there a place I can configure this setting and re-enable it? The speaker icon in task tray was also disabled with the update, but I re-enabled that from the Control Panel. Is this simply gone with the driver update? Thanks for the help!

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• What does motherboard RAM slot colors mean?

  - by totymedli

  I always saw that the motherboard RAM slots are colored in pairs, but never know what does it means. I just put the 2 RAM in, and after a few tries it always worked. But after I tried to install a third one it always throws me a blue screen of death. Is there an order how should I install RAM to the borad? What does the colors mean? Does they indicate performance boost opportunity or are they just a guide for installation?

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• Worthless Anti-Spam (What can we learn)

  - by smehaffie

  I recently can across a site that had a “anti-spam” field at the bottom of the entry from.  The first issue I had with it was that at 1280X800 you could not read the value you were suppose to enter (see below).  You tell me, should you enter div, dlv, piv, or plv. But even worse than not being readable at high resolutions is the fact that the programmer who coded it really did not understand what this was used for.  An anti-spam (aka: catpcha) entry field should not be able to be read by looking at the HTML DOM object (so entry of value cannot be scripted).  In this case the value is simply a disabled text input filed that has the value you need to type.  So a hacker would simply need to search for text input field named “spam2” and then they could flood the site with spam. 1: <td> 2: <label> 3: <input name="spam1" type="text" class="small" id="spam1" size="6" maxlength="3" /> 4: <input name="spam2" type="text" class="small" id="spam2" value="plv" 5: disabled="disabled" size="6" maxlength="3" /> 6: * <span class="small">- Anti-SPAM key - please enter matching value</span> 7: </label> 8: </td>   There are some things to learn from this example: 1) Always make sure you understand why you are coding a feature/function for any program you write.  Just following the requirements without realizing the “why” will sooner or later come back to bite you.  I think the above example appears to be an example of this. 2) Always check how the screen appears in different resolutions.  In this case it was pretty much unreadable in 1280x800, but you could read it in 800X600 (but most people I know do not have their resolution set that low).  Lucky for me I could “View Source” and get the value I needed to enter.

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• Drawing visible tiles - side scrolling

  - by Troubleshoot

  Currently I'm calling drawMap every time repaint is called. This is the code I've written for my drawMap method so far. public void drawMap(Graphics2D g2d) { float cameraX = Player.getX() - (Frame.CANVAS_WIDTH / 2); float cameraY = Player.getY() - (Frame.CANVAS_HEIGHT / 2); int tileX = (int) cameraX; int tileY = (int) cameraY; int xIndent = 0, yIndent = 0; int a = 0, b = 0; while (tileX % TILE_SIZE != 0) { tileX--; xIndent++; } while (tileY % TILE_SIZE != 0) { tileY--; yIndent++; } for (int y = tileY; y < tileY + Frame.CANVAS_HEIGHT; y += Map.TILE_SIZE) { for (int x = tileX; x < tileX + Frame.CANVAS_WIDTH; x += Map.TILE_SIZE) { if ((y / TILE_SIZE < 0 || x / TILE_SIZE < 0) || (y / TILE_SIZE > columnSize)) break; g2d.drawImage(map[y / TILE_SIZE][x / TILE_SIZE], a - xIndent, b - yIndent, null); a += TILE_SIZE; } a = 0; b += TILE_SIZE; } } The idea behind this is that it gets the camera position and draws the map relative to the player position. However, instead of the player being in the center of the screen all the time, the player actually moves away from the center as it scrolls to the right, and moves towards to center as it scrolls to the left. I've been trying to pinpoint what I've done wrong but I can't seem to find it. My code also seems quite messy, so am I doing this the correct way?

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• Ubuntu 12.04 won't shut down - stopping winbind daemon

  - by jan

  My Precise Pangolin sometimes won't shut down - the screen is black with text on it. Mostly last line says something like "stopping winbind deamon" (sometimes also virtualbox, which is above winbind daemon; edit: sometimes the last line says "running unattended updates") and it stays like this for about ten miutes. Then I usually hold the power button for 5s to shut it down. It's very unpredictable - sometimes the computer shuts down without problem and sometimes it hangs. I've tried many ways to shut it down: HW button, panel applet, sudo shutdown -h now, sudo poweroff, sudo halt, etc. even sudo reboot or restart from panel applet have this problem. Sometimes it works ok but every method named hung at least once on the same (damned) line. My specs: FUJITSU SIEMENS LIFEBOOK E8310, Intel Core2 Duo T7300 @ 2.00GHz, 3GB RAM, GPU: Mobile Intel(R) 965 Express Chipset Family Ubuntu 12.04.2 32bit, 3.5.0-41-generic kernel (but it did it on older kernels and 12.04.x systems too). Any ideas what should I try next? Thanks a lot! Jan

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• Is there a way to make catalyst driver work in Trusty for the radeon hd4330?

  - by Laurent BERNABE

  Though official Catalyst software 13.1 is suitable for ati radeon hd4330, it can't be installed on Ubuntu 14.04 as it can't support Xorg = 7.6 As I need proprietary drivers for trusty, I would like to know if there is a way to bypass this limitation ? (For example by fetching driver sources) Here are some results from the terminal : $ Xorg -version X.Org X Server 1.15.1 Release Date: 2014-04-13 X Protocol Version 11, Revision 0 Build Operating System: Linux 3.2.0-37-generic x86_64 Ubuntu Current Operating System: Linux bordeaux80 3.13.0-27-generic #50-Ubuntu SMP Thu May 15 18:06:16 UTC 2014 x86_64 Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.13.0-27-generic root=UUID=4015e6f7-d11a-45fd-ac9b-5b6c7ab9eaa0 ro quiet splash vt.handoff=7 Build Date: 16 April 2014 01:36:29PM xorg-server 2:1.15.1-0ubuntu2 (For technical support please see http://www.ubuntu.com/support) Current version of pixman: 0.30.2 Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. $ xrandr Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192 LVDS connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 353mm x 198mm 1366x768 60.0*+ 1280x720 59.9 1152x768 59.8 1024x768 59.9 800x600 59.9 848x480 59.7 720x480 59.7 640x480 59.4 VGA-0 disconnected (normal left inverted right x axis y axis) HDMI-0 disconnected (normal left inverted right x axis y axis) $ uname -rp 3.13.0-27-generic x86_64 $ glxinfo | grep OpenGL OpenGL vendor string: X.Org OpenGL renderer string: Gallium 0.4 on AMD RV710 OpenGL core profile version string: 3.1 (Core Profile) Mesa 10.1.0 OpenGL core profile shading language version string: 1.40 OpenGL core profile context flags: (none) OpenGL core profile extensions: OpenGL version string: 3.0 Mesa 10.1.0 OpenGL shading language version string: 1.30 OpenGL context flags: (none) OpenGL extensions: Regards

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• Material to use for computer system cover against UV and salty air?

  - by hippietrail

  I live right next to the sea and have a large window quite close to my computer setup which allows a lot of indirect sunlight to enter. I'd like to buy or make a cover for my computer system. From visiting my usual mom & pop computer shop yesterday I got the impression these might not really exist any more. If I make my own I need a material with these qualities: Block or reduce ultraviolet light which can depolymerize plastics (the sun here in Australia is much stronger than in the northern hemisphere). Block salt-laden sea air which can oxidize USB and other connectors. Not cause static electricity when covering or uncovering. Keep dust off of course (-: My setup is a laptop plugged into a wide-screen LCD with a few external drives. So I think I'd want a largish sheet to flop over the whole desk. Are such covers commonly sold these days? What material(s) should I look for which provides the listed attributes?

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• Grub problem - Command prompt

  - by RhZ

  Update: Thanks to all who helped. I gave up and am going to re-install. Not the end of the world, no files will be lost :-) This time will be backing up grub haha. Thanks again, I really appreciate the community's help on this. I was going along fine when the new pae kernel came down, and it had some bug where the sound was all messed up. So I used startup manager to choose the older pae kernel and rebooted. But startupmanager must have fuXXored my grub. When I re-booted, I get thrown directly into memtest and thats it. I tried to re-install grub using the live disc method that I found in many places. That changed something so I get a prompt and the message: "GNU grub version 1.99 ubuntu. Minimal BASH-like editing is supported. Type help for complete list." But then I tried the live CD fix again and now am back at the memtest... What can I do to get my system running again? UPDATE: Just to be clear,when I start up I get a blinking cursor in the top left, and the word 'ON' in the middle of the screen. Then, after a good minute or two, the memtest starts.

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• Ubuntu doesn't start and I can't login [migrated]

  - by Meph00

  My ubuntu 13.04 doesn't boot anymore. Eternal black screen. If I press ALT+CTRL+F1 I see that it's stucked on "Checking battery state [OK]." I'd like to try to go with sudo apt-get install gdm but I can't login on terminal tty2, tty3 etc. They correctly ask for my nickname, then they make me wait a lot, ask for password and make me wait again. After a lot of time (... a lot) the best I could achieve was visualizing "Documentantion https://help.ubuntu.com". I can never reach the point where I can give commands. Plus, during the long pauses, every 2 minutes it gives a messagge like this: INFO: task XXX blocked for more than 120 seconds. Any suggestion? Sorry for my bad english and thanks everyone for the attention.

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• Ubuntu on Samsung NP700Z5B - no Grub

  - by copolii

  I just bought a Samsung NP700Z5B laptop. Gorgeous machine and great performance! I do 2 things when I get a new laptop: Format the HD and install Winblows from a CD to ditch the bloatware Install some variant of Linux on it (lately Ubuntu) Step 1 worked fine (until earlier today), but I haven't been able to install Ubuntu on it for the past 3 days! I've tried Mint12, Ubuntu 12.04, Ubuntu 11.10, Ubuntu 11.04 and Ubuntu 10.04. The live CD and the installations all run fine and report no problems, but when I reboot grub is nowhere to be found! The system goes directly to Winblows! I've tried booting from the liveCD and re-installing grub via the chroot and purge & reinstall methods (https://help.ubuntu.com/community/Grub2) and neither makes a difference. I've also tried copying the boot sector: dd if=/dev/sda of=linux.bin bs=512 count=1 and putting it on c: then setting bcdedit to add the entry to the Windows bootloader with no results. Earlier today I decided to try and set my boot partition as an EFI boot partition ... bad choice, now I don't even have the Winblows boot loader. I've officially ran out of ideas. Tried calling Samsung, but they're closed (they'd probably say something stupid along the lines of "Samsung recommends Windows 7" ... I've had Dell say that to me). Any help would be greatly appreciated. Update 1 Tried re-installing 12.04 and now I get the screen continously turning off and back on, but still no sign of booting ... it has been doing it for 15 mins so far (I set the boot partition type to ext2 instead of ext4) Update 2 Well ... this just gets better and better. I inserted the installation USB key to reboot it and the flickering stopped for about a minute (remained on) then it started turning off and on again

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• Impact Earth Lets You Simulate Asteroid Impacts

  - by Jason Fitzpatrick

  If you’re looking for a little morbid simulation to cap off your Friday afternoon, this interactive asteroid impact simulator makes it easy to the results of asteroid impacts big and small. The simulator is the result of a collaboration between Purdue University and the Imperial College of London. You can adjust the size, density, impact angle, and impact velocity of the asteroid as well as change the target from water to land. The only feature missing is the ability to select a specific location as the point of impact (if you want to know what a direct strike to Paris would yield, for example, you’ll have to do your own layering). Once you plug all that information in, you’re treated to a little 3D animation as the simulator crunches the numbers. After it finishes you’ll see a breakdown of a variety of effects including the size of the crater, the energy of the impact, seismic effects, and more. Hit up the link below to take it for a spin. Impact Earth [via Boing Boing] How To Delete, Move, or Rename Locked Files in Windows HTG Explains: Why Screen Savers Are No Longer Necessary 6 Ways Windows 8 Is More Secure Than Windows 7

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• Dell D630 - Touchpad does not move the mouse cursor

  - by Dean McKenzie

  Windows XP - Dell D630 - Synaptics Touch Pad driver installed. The system tray icon that shows the movement of your finger on the touchpad registeres movement. The scroll feature of the touchpad works on any window with a scroll bar. The double click works even. But it never actually moves the cursor on the screen. An external mouse works with out problems, and I've replaced the palm-rest/touchpad and it continues to happen. The touch stick in the middle of the keyboard works without problems. Does anyone have any ideas?

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• Weird RAM Upgrade Experience

  - by Axel Isouard

  I have a laptop, HP EliteBook 8540p having originally 4GB RAM and I've recently bought Corsair Value Select SO-DIMM 16 Go (2x 8 Go) DDR3 1333 MHz. It fits the required RAM specifications perfectly, and once I've inserted them, the BIOS recognizes the memory correctly, but my linux Gentoo running on kernel 3.1.6 SMP x86_64 crashes immediately when I'm running an app which consumes a lot of memory. The laptop crashes as if there's no more battery left, when the memory reaches at least 6000MB ram. Windows 7 doesn't want to run anymore, it shows a blue screen with the IRQ LESS OR EQUAL error if I set 8GB, and it doesn't boot at all if I set 16GB. Is there something I could do to fix this please ?

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• Sub-systems in game engines

  - by Hillel

  So here's the problem- I'm writing my own engine library, and it works fine with stuff like menus and the actual game screen. The thing is, I can't really figure out how to integrate something like an intro or dialogue preceding certain levels into this system. Let's look at another example- say I have a game-specific engine which gets a Level object and runs it. Engine would have its own collision and physics system, all hard coded. Now, what if at some point in a level, I want the player to enter a mini-game with different rules? How do I morph the Engine class to support these sub-systems without having to deal with their code all the time (as in: if(regular game) ... else if(mini game) ...)? And what if I want an intro animation at the start of a level, and I want the player to be able to assume control of his character once the animation ends, do I implement the animation into the Engine class itself? Or maybe I need to run another class, CutScene, and when it ends, it calls Engine and starts the level? What if I want to add a dialogue system, where at the start of each level there's a short dialogue and the player can't control his character, and once it ends, he can? Would I then run the dialogue code inside the Engine code? Maybe these sub-systems should all be scripted? I don't know anything about scripting, is it necessary for this kind of situation? Any help would be appreciated.

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• 10.04 Window manager not working

  - by jackg

  Using an old mx200 128Mb AGP card. Log in ok. Sometimes the top and bottom bars do not appear, sometimes one sometimes both sometimes none. The menus on firefox/thunderbird and others disappear when I move the pointer from the menu heading to the menu itself. I can't play you tube videos, nor pacman, so the world has ended as I know it. If I type sudo metacity --replace in a terminal the window manager seems to work fine. But I don't know how to make this permanent. One option was: System menupreferencessessions In the sessions tab make sure that "automatically save changes to session" is checked. I don't have a sessions option in the preferences menu. So...? Must be a line of code in a terminal I can use to get round this. I have not upgraded to Ubuntu 11... because the graphics card is so old that I cannot get any decent screen resolutions when I do. On 10.04 I disable the Nvidia driver for the same reason and use 1024x768. Ta

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