My 14.04 system also suffers from a variation of this problem. FWIW, I find that the "flicker problem" is tied to the PERFORMANCE LEVEL of my GTX 275. If I watch the GPU from the PowerMizer panel of the "NVIDIA X Server Settings" application, the "flicker problem" appears when the Performance Level drops to 0. At Performance Level 1 or 2, the problem disappears.
By "flicker problem", I mean that the screen erratically switches between a partially-updated display and a fully-updated display. All applications that don't "sufficiently challenge" the GPU, and cause the nVidia Performance Level to climb, suffer from this problem! However, if I run one of my high frame-rate OpenGL programs, the problem disappears, until I exit the application, and give the nVidia driver stack a chance to settle back down to Performance Level 0. BTW, none of the Compiz tweaks mentioned in this thread, or any other, has helped my situation, only the Performance Level matters. I'm now running nVidia Driver version 340.46, but the problem existed when I was running 331. My system is an "old" LGA 1366 Quad Core i7 with 12GB of memory, and a GTX 275. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1314367 Title: Flickering with Ubuntu 14.04 and nvidia card reappeared Status in “xorg” package in Ubuntu: Confirmed Bug description: As requested in Bug #1310633 I'm opening a new bug. With a previous version of Ubuntu I already had this flickering. With additional options for the kernel module I was able to fix the flickering. options nvidia NVreg_RegistryDwords="PerfLevelSrc=0x2222" NVreg_Mobile=3 NVreg_ModifyDeviceFiles=0 With version 14.04 and the nvidia-331 (331.38-0ubuntu7) driver the flickering reappeared although the line is still present in options.conf. Using modprobe --resolve-alias nvidia I found the correct driver module name which in my case is nvidia_331. Changing the module name in options.conf to nvidia_331 X doesn't start anymore. Removing the NVreg_ModifyDeviceFiles option X is starting again, but does not solve the issue. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: xorg 1:7.7+1ubuntu8 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 NonfreeKernelModules: nvidia .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0' .proc.driver.nvidia.registry: Binary: "" .proc.driver.nvidia.version: NVRM version: NVIDIA UNIX x86_64 Kernel Module 331.38 Wed Jan 8 19:32:30 PST 2014 GCC version: gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) .tmp.unity.support.test.0: ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: None CurrentDesktop: Unity Date: Tue Apr 29 21:09:41 2014 DistUpgraded: 2014-04-17 23:47:50,572 DEBUG enabling apt cron job DistroCodename: trusty DistroVariant: ubuntu DkmsStatus: bbswitch, 0.7, 3.13.0-24-generic, x86_64: installed nvidia-331, 331.38, 3.13.0-24-generic, x86_64: installed vboxhost, 4.3.10, 3.13.0-24-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: NVIDIA Corporation GT215GLM [Quadro FX 1800M] [10de:0cbc] (rev a2) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Device [103c:1521] InstallationDate: Installed on 2012-11-17 (528 days ago) InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5) MachineType: Hewlett-Packard HP EliteBook 8540w PccardctlStatus: Socket 0: 3.3V 16-bit PC Card Subdevice 0 (function 0) bound to driver "pata_pcmcia" ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=c6af930a-63f1-4015-9c42-bdde793e3e5a ro quiet splash SourcePackage: xorg UpgradeStatus: Upgraded to trusty on 2014-04-17 (11 days ago) dmi.bios.date: 09/13/2013 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 68CVD Ver. F.24 dmi.board.name: 1521 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 32.35 dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr68CVDVer.F.24:bd09/13/2013:svnHewlett-Packard:pnHPEliteBook8540w:pvr:rvnHewlett-Packard:rn1521:rvrKBCVersion32.35:cvnHewlett-Packard:ct10:cvr: dmi.product.name: HP EliteBook 8540w dmi.sys.vendor: Hewlett-Packard version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1 version.ia32-libs: ia32-libs 20090808ubuntu36 version.libdrm2: libdrm2 2.4.52-1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5 version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2 xserver.bootTime: Tue Apr 29 21:06:04 2014 xserver.configfile: default xserver.errors: open /dev/fb0: No such file or directory xserver.logfile: /var/log/Xorg.0.log xserver.outputs: xserver.version: 2:1.15.1-0ubuntu2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1314367/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
