I have faced the same thing on both Ubuntu 12.04 and 13.04 as well as on openSUSE 12.3 with darktable 1.2.2 and nvidia proprietary drivers (different versions: 304, 310) for GT430 card.
In my case systems froze completely so that I needed to reboot with the magic SysRQ keys or using the hard button. The garbage on the screen was quite the same, though I couldn't switch to the console to check it out. I would also like to add that in Ubuntu cases Xorg was glitching even after a reboot (after three or four of them, to be exact). The crash happens from time to time, with no dependency on the number of photos in the roll or on the style and type of edits made to the photos. I'm attaching an archive of two files made on the current Ubuntu 12.04 (as of 17.07.2013). - darktable.debug is what I was able to record with $ darktable -d all command - darktable.strace was made with $ starce -p [darktable pid] The commands were executed in the background until the system froze and had to be rebooted. Hope that this might help. P.S. As for the moment, I removed darktable to prevent running it. In case it will be needed to reproduce, I will be glad to install it again. ** Attachment added: "The archive of two files with debugging and strace records." https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/899669/+attachment/3740438/+files/darktable.tar.gz -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/899669 Title: Screen Corruption and crash after Gnome Shell login Status in “xorg-server” package in Ubuntu: Confirmed Bug description: Steps to Reproduce: 1. Boot Ubuntu 11.10 64-bit into Gnome Shell 2. Observe black flashing squares near Activities button Observed results: I'm on 11.10 Gnome Shell, and about once a day, there's a screen corruption around the "Activities" button right after boot: a random group of black squares flashing on and off. If I continue working, the corruption will get worse, and the top of the screen fills with garbage spreading from left to right. See attached screenshots. Eventually, Ubuntu crashes to the login screen. Only occurs right after login. If it doesn't happen then, it never happens, so right now, when I see it, I log out and back in and I'm good. Notes: My PC is a desktop. Hardware: CPU: AMD Phenom II X6 1090T Six Core Processor AM3 3.2GHZ Graphics: Gigabyte GeForce GTX 460 1GB Fermi 760MHZ Software: Ubuntu 11.10 64-bit Gnome Shell Nvidia 290.10 drivers ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: xorg 1:7.6+7ubuntu7 ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6 Uname: Linux 3.0.0-13-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 290.10 Wed Nov 16 17:39:29 PST 2011 GCC version: gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3) .tmp.unity.support.test.0: ApportVersion: 1.23-0ubuntu4 Architecture: amd64 CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,gnomecompat,move,water,regex,vpswitch,imgpng,place,mousepoll,grid,animation,resize,unitymtgrabhandles,wall,wobbly,session,workarounds,expo,fade,scale,ezoom,unityshell] CompositorRunning: None Date: Sat Dec 3 10:41:20 2011 DistUpgraded: Fresh install DistroCodename: oneiric DistroVariant: ubuntu DkmsStatus: nvidia-current, 290.10, 3.0.0-13-generic, x86_64: installed DpkgLog: ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: nVidia Corporation GF104 [GeForce GTX 460] [10de:0e22] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Giga-byte Technology Device [1458:34fc] InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) JockeyStatus: xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use) xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release updates) (Proprietary, Disabled, Not in use) MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-13-generic root=UUID=e481fddc-5155-4fdf-b0fb-ef8e9a2c1e31 ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) XorgConf: Section "Device" Identifier "Default Device" Option "NoLogo" "True" EndSection dmi.bios.date: 05/20/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 080015 dmi.board.name: JW-A870T-UC3 dmi.board.vendor: JW Technology dmi.board.version: V1.0 dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080015:bd05/20/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnJWTechnology:rnJW-A870T-UC3:rvrV1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu6 version.ia32-libs: ia32-libs 20090808ubuntu26 version.libdrm2: libdrm2 2.4.26-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3 version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2.1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/899669/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp