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• How can I recover from a frozen app when connecting over VNC

  - by Pablojim

  I have a htpc running 10.10. It has no keyboard or mouse attached, so I connect over vnc for administration and manual tasks. This usually works fine but every so often an app running in fullscreen mode crashes. All I want to be able to do is kill this app from VNC. Is there a keyboard shortcut to do this that will preserve the VNC connection? If I use CTRL + ALT + F1, I see the terminal but can no longer control it from VNC. Trying to return to the desktop doesn't work either? Any easy process I can follow?

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• Ad-Driven Apps Are Sucking Your Android Battery Dry

  - by Jason Fitzpatrick

  Ads in free Android apps might be annoying but you probably never imagined they were radically draining your battery. New research from Purdue University and Microsoft highlight just how much ad-driven apps tank your battery life. What did they find? That poorly designed ad-modules in free ad-driven applications are terrible at conserving energy. In popular applications like Angry Birds and Free Chess 70% of the energy the application consumed was used to drive the ads. They also surveyed other applications and found that ad-driven apps weren’t alone in excessive battery use–the New York Times app, for example, spent 15% of its battery consumption on tracking and background tasks. Hit up the link below to read the full whitepaper for a more in depth look at the methodology and results. Fine Grained Energy Accounting on Smartphones with Eprof (PDF) [via ZDNet] Make Your Own Windows 8 Start Button with Zero Memory Usage Reader Request: How To Repair Blurry Photos HTG Explains: What Can You Find in an Email Header?

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• Kernel freezes with nvidia optimus and bumblebee on 12.04

  - by piovisqui

  I have a Sony VAIO with Intel i7-3520M and NVIDIA Corporation GK107M [GeForce GT 640M LE]. I installed bumblebee and nvidia drivers. They work almost fine, but the system freezes like in a kernel panic once every day. I can play Dota 2 with primusrun on it with 20-30fps 1080p. But when I do something simple as expanding the KDE calendar widget from the bottom right corner, the system hangs a lot and windows borders get another border. The system freezes in not very intensive graphic tasks, for instance, ALT+TAB with KWin effects or pressing ALT+F2 for poping up the launcher. How can I solve this? Info: I use KDE. Couldn't paste de logs here, check at pastebin: http://pastebin.com/SBet8fRQ

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• Moonlight stopped working on tvp.pl

  - by Oliverka

  Hello, I'm watching The Bold and the beautiful on the site: http://www.tvp.pl/seriale/obyczajowe/moda-na-sukces/wideo Yesterday I wanted to view next episode, however it didn't work. I checked various episodes from other points in time and none works. The "dots" that appear when a Silverlight video is loading are present, but after them there is only black screen (of death). I'm using Ubuntu Lucid Lynx 32 bit with GNOME2 and firefox 3.6. I have all updates done. Could somebody check if any video is working for them and tell me their setup, please? I'm using Moonlight 3. Two days ago everything was fine but later this problem appeared.

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• How can I get a USB floppy drive to work?

  - by jfmessier

  I have a Toshiba USB floppy drive that I need to use under Ubuntu. When I connect it, and insert a floppy disk in it, I do not see anything mounted under Ubuntu 10.10. I was suspecting the hardware and/or the floppy disk to be defective, and so I tested the floppy disk as well as the floppy drive itself under Windows XP, and everything was just fine. I was able to find the following instructions: Add the following line to the /etc/modules file: floppy Enter the following shell commands: mkdir /media/floppy mount -t vfat /dev/sdc /media/floppy -o uid=1000 This will mount the floppy, but I would like this to happen automatically, so when I connect the drive to the USB port, it automatically mounts the floppy. How can I make this work? Or does Ubuntu only work with internal Floppy drives?

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• Lenovo u400, Ubuntu 12.04. Sudden reboots / power down

  - by Victor Neo

  I've recently bought a Lenovo u400 (http://www.lenovo.com/products/us/laptop/ideapad/u-series/u400/) and installed Ubuntu 12.04 on it. Everything works fine (I've installed the proprietary ATI drivers for switchable graphics) except that I get a random power down or reboot either while surfing the web or watching videos. Monitoring the temperature with sensors, the laptop never goes into any critical zone but still may power down or reboot once in a while. Is there any logs that I should check and any particular message I should take note of? EDIT: This happens to me as well. This also happens without proprietary drivers activated.

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• Consistency of DirectX models

  - by marc wellman

  Is there a way to check the consistency of a DirectX model (.x) ? Whilst compiling .x files with XNA GameStudio 3.1 compilation is aborted with the following error message: Error 2 Could not read the X file. The file is corrupt or invalid. Error code: D3DXFERR_PARSEERROR. C:\WFP\Browser\Content\m.x KiviBrowser Some models compile correctly without any error/warning and some abort as described. The files of each model have several thousand lines. I am creating the files in Googles SketchUp 8 where they all look fine and don't show any sign of corruption. Suppose I have such a model my XNA compiler won't compile because their is an inconsistency somewhere in the file - how could I identify this in order to correct it ?

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• Error accessing Gio.Gsettings on application made in quickly

  - by Zane Swafford

  I am trying to develop an application using the quickly/pygtk stack. I got my Gsettings schemas all set up in ~/app-name-here/data/glib-2.0/schemas/net.launchpad.app-name-here.gschema.xml correctly and I am able to access it just fine in my preferences dialog window that is located in ~/app-name-here/app-name-here/PreferencesDialog.py via from gi.repository import Gtk, Gio settings = Gio.Settings("net.launchpad.app-name-here") settings.get_boolean('notify') settings.set_boolean('notify', True) but when I try to check the value of one of my settings in a file located in ~/app-name-here/bin/Daemon.py that I use as a script to run in the background and send notifications by a similar method of from gi.repository import Gio settings = Gio.Settings("net.launchpad.app-name-here") settings.get_boolean('notify') it fails at the line that says settings = Gio.Settings("net.launchpad.app-name-here") and spits out a nasty error (Daemon.py:26100): GLib-GIO-ERROR **: Settings schema 'net.launchpad.app-name-here' is not installed Despite the fact that I can open up dconf-editor and find the settings under net/launchpad/app-name-here. Any thoughts?

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• HLSL problem with divide by homogeneous component

  - by Berend

  When I try to divide my position.z by my position.w in HLSL I get as result always 1.0f or higher. Is this a common problem for some reason? When I divide my position.x or y by the w this works fine. But the divide for the z gives a wrong result. I use the view matrix for my camera and the projection matrix as i use it in the game because I want to create a depthmap from the cameraposition. Can anybody explain what I'm doing wrong? Do I need another view matrix?

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• Firefox: middle mouse button stopped working

  - by diversario

  In Firefox, middle mouse button/wheel has been assigned "Open link in new tab" action for a while now, by default. Since I ran Software Update tonight, this action doesn't work in Firefox anymore. To be specific, middle mouse click doesn't open links anymore. At the same time, it closes tabs just fine (middle-click a tab == 'Close tab'). I don't know the update details, but I remember that Firefox update was there among other things. I tried running Firefox with a clean profile and middle button did work there, so something must've changed with existing settings.

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• No graphics after installing AMD Catalyst 12.4 and installing the recommended updates afterwards

  - by Innonic

  Some days ago, I installed Ubuntu 12.04. Since I wanted to use dualview using an external display I installed the propriatary AMD Catalyst 12.4. The graphics are fine, but if I run the updates found by the updates manager, Ubuntu won't be able to start with graphics after reboot. I installed Ubuntu 3 times until I realized what the problem was. So now I got the basic installation with Catalyst running but I can't update the system. Is there any solution to this? Or can I somehow identify which update causes this? My System is a Lenovo y560 Ideapad (Intel Core i7, 8GB RAM, with AMD Radeon HD 6570M/5700 Series. Thank you in advance

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• How do I keep track of modifications to a new server?

  - by eveo

  I purchased a server for the sole purpose of familiarizing myself with the CLI so I don't get royally screwed when I enter a real development environment. However, I have some questions. I've managed to SSH into my server, all is fine and dandy, installed LAMP too which went flawlessly. Now I'm wondering, the more changes I do, the more cluttered my server will become. Can I revert changes? I don't want to keep customizing things and installing things and just having a cluttered server overall. Where can I track changes to my system?

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• How to import a pdf in libreoffice? under ubuntu, all pages are blank

  - by Daniele

  I have some .pdf generated by a scanner, that I want to import in LibreOffice and do some small editing. The PDF has only one object per page, a page-size image. If I open it in LibreOffice under Ubuntu 12.10, it imports "successfully" but all pages are blank. I have the libreoffice-pdfimport package installed. That is true with both LibreOffice 3.6 (part of Ubuntu 12.10) and with 4.0.2, from libreoffice ppa. The same .pdf files open perfectly fine on both LibreOffice for Windows and LibreOffice for Mac (yes, I have three computers with all three OSes), but on Ubuntu 12.10, all pages are blank, so I can only conclude this is an issue with Ubuntu packaging, or something really weird prevents it from working under linux. How can I import these kinds of .pdf into LibreOffice for editing?

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• Why do we keep using CSV?

  - by Stephen

  Why do we keep using CSV? I recently made a shift to working the health domain and despite the wonderful work in data transfer standards, all data transfer is in CSV, both for reporting to external organisations, and for data migrations when implementing new systems. Unfortunately the use of CSV is the cause of the endless repetition of the same stupid errors, with the same waste of developer time. (bad escaping, failing to handle null fields etc.) I know we can do better, and anything between JSON and XML (depending on the instance) would be fine. (Most of the time this is data going from one MS SQLserver 2005 to another!) I feel as if each time I see this happening I am literally watching one developer waste anothers time. So why do we keep shafting each other? When will we stop?

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• Can't edit/drag-and-drop widgets in QtCreator in Unity, Gnome3 - ok

  - by Maksim

  I have QtCreator 2.4.1 (Qt 4.7.4) installed on Ubuntu 12.04 LTS x86. When I try to change UI - drag-and-drop any widget (buttons, label, etc.) it won't let me do it, like it's read-only. The icon when I drag is a circle with a line through it. I've found that problem in Unity and it's suggested to install Gnome3 shell - Can't edit/drag-and-drop widgets in QtCreator I tried to install Gnome3 and it works fine as expected. But the question, is there any other way to work proper with QtCreator in Unity?

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• How to Access Boot Options 12.04 Live USB

  - by Ryan Kampmeier

  I'm attempting to install 12.04 on my computer but booting from my USB drive results in a blank screen. This has happened since 10.04 and has always been fixed by putting nomodeset in the boot command, but now I can't access the boot options with F6 for some reason. How can I access the boot options? I booted into the live image on a different computer and it worked fine. I'm sure it's because of my Nvidia graphics. When I boot into the live image it shows a small gray box in the lower left corner of the screen and that's it. I can't edit the boot options or do anything else. Thanks in advance.

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• comparison of an unsigned variable to 0

  - by user2651062

  When I execute the following loop : unsigned m; for( m = 10; m >= 0; --m ){ printf("%d\n",m); } the loop doesn't stop at m==0, it keeps executing interminably, so I thought that reason was that an unsigned cannot be compared to 0. But when I did the following test unsigned m=9; if(m >= 0) printf("m is positive\n"); else printf("m is negative\n"); I got this result: m is positive which means that the unsigned variable m was successfully compared to 0. Why doesn't the comparison of m to 0 work in the for loop and works fine elsewhere?

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• GRUB- error: no such partition grub rescue and Error: No default or UI configuration directive found boot > on pendrive

  - by Ash

  I have dell inspiron, previously I installed Ubuntu 11.10 on my Windows 7 and made it dual boot. But since I want to upgrade my Ubuntu version and change the partition spacing, I deleted 11.10 partition directly and extended my hardrive space (Windows + Ubuntu) at that moment everything was fine. Then I prepared a 12.04 32bit USB and installed it . It was installed but isn't showing dual boot option like 11.10 and my machine directly boot into Windows 7. So instantly i again deleted my 12.04 partition . Now I login into Windows 7 but whenever I put USB ( with 12.04 ) to boot from it, I am facing error of "no such partition grub rescue" even though I try to put lower version(11.04) it showing another error "Error: No default or UI configuration directive found boot " I have reinstall Windows 7 and reformat all partition, still I am facing same error :(

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• Wired connection stops working suddenly

  - by user90950

  I have Ubuntu 12.04.I was downloading something via aria..and then it suddenly stopped..no connection to Internet. I tried to ping the host but no reply..also tried to ping the route 192.168.250.1 but no reply got a message saying 'Ubuntu 12.04 has experienced internal error'. I restarted system but nothing is sorted out. The wired connection 'establishes' but I am not able to use Internet or ping either to host/route/8.8.8.8. The wireless is working fine and it does connect to Internet. I have a static IP address for wired connection and it does connect to Internet on Windows OS installed on this same Laptop with same IP settings.. please suggest how do i get my wired connection start working properly again..

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• I cant see my windows drive in ubuntu

  - by Shardul Dhande

  I'm n00ber than any n00b you ever seen, so bear with me... I just downloaded wubi and installed ubuntu 12.10 along with Windows 7 on the same HDD. Linux works fine, but doesnt show files from drive C (on which it is installed). I really need C as it contains all my files. I did df -h in the terminal. It does show the drive. /dev/sda2 577G 220G 358G 38% /host Now I tried to mount the drive sudo mount /dev/sda2 and got the response mount: /dev/sda2 already mounted or /host busy mount: according to mtab, /dev/sda2 is already mounted on /host I dont know what that means. The drive doesnt show up in HOME FOLDER. What am i supposed to do now?

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• How to download streaming video from a flash player (arte)?

  - by wim

  there are a couple of concerts that I would very much like to view from Arte (I think it's a french TV channel?) but my connection is not good enough to stream the video. How can I download the file to play it locally? Here is an example link: http://www.my-jazzlive.tv/?p=1862 I have tried popular browser plugins such as DownloadHelper and Flash Video Downloader, these are working fine for me on sites such as youtube but they don't seem to recognise any stream from the Arte video player. I also looked through /tmp for something that looks like a partially downloaded video, but no luck.

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• 12.04 64 bit: Keybord not responding for about 20 seconds at startup/beginning of session

  - by Danilo

  I am running Ubuntu 12.04 64bit. When I get at the login screen and try to type the password for my user, I cannot type anything for about 20 seconds. After that, the keyboard starts responding and everything works fine. Mouse is responding normally as well as all buttons of the login interface (time/calendar, session selection (Unity/Unity 2D), etc.). What could be the reason for this behavior? How can I solve this temporary freeze of the keyboard so that I can type my password immediately without having to wait each time? Thanks for your time. EDIT: I tried auto login, but the problem is still there: the Desktop loads but even there, if I try to type something in the dash or anywhere else, I must wait about 20 seconds before I can actually start typing. Can the issue be related to some keyboard modules that get loaded little bit "too late"?

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• Gnome panel hides window titlebar.

  - by Xorty

  I moved my laptop screen "below" external screen (was using left/right config before). There's a little problem. When my gnome panel is on top of laptop screen, all windows I maximize "drawn" under top gnome panel. Therefore, I cannot see window titlebar. I tried suggested fixes as metacity --replace and so on, but none worked. When I move my taskbar to bottom it works just fine. Any ideas? Thank you.

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• Object-Oriented OpenGL

  - by Sullivan

  I have been using OpenGL for a while and have read a large number of tutorials. Aside from the fact that a lot of them still use the fixed pipeline, they usually throw all the initialisation, state changes and drawing in one source file. This is fine for the limited scope of a tutorial, but I’m having a hard time working out how to scale it up to a full game. How do you split your usage of OpenGL across files? Conceptually, I can see the benefits of having, say, a rendering class that purely renders stuff to screen, but how would stuff like shaders and lights work? Should I have separate classes for things like lights and shaders?

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• Beginner question about vertex arrays in OpenGL

  - by MrDatabase

  Is there a special order in which vertices are entered into a vertex array? Currently I'm drawing single textures like this: glBindTexture(GL_TEXTURE_2D, texName); glVertexPointer(2, GL_FLOAT, 0, vertices); glTexCoordPointer(2, GL_FLOAT, 0, coordinates); glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); where vertices has four "xy pairs". This is working fine. As a test I doubled the sizes of the vertices and coordinates arrays and changed the last line above to: glDrawArrays(GL_TRIANGLE_STRIP, 0, 8); since vertices now contains eight "xy pairs". I do see two textures (the second is intentionally offset from the first). However the textures are now distorted. I've tried passing GL_TRIANGLES to glDrawArrays instead of GL_TRIANGLE_STRIP but this doesn't work either. I'm so new to OpenGL that I thought it's best to just ask here :-) Cheers!

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