Another workaround to avoid this drm issue is to remove the grub splash option.
** Description changed: Screen corruption occurs at start up and reboot, for - login screen - desktop screen Prerequisities: - running the nouveau driver - - running the 3.5.0-10 and -11 kernels + - running the 3.5.0-10 and -11 kernels At non-autologin one can type the login password blindly but just to enter a corrupted desktop screen. At autologin a corrupted desktop screen is presented. The CPU-load is very high and caused by millions of loggings of messages like: [drm] nouveau 0000:02:00.0: PFIFO_CACHE_ERROR - Ch 2/2 Mthd 0x0800 Data 0x00000000 so it seems to be related to DRM and the PFIFO cache. Workaround 1: Use an older kernel, e.g. 3.5.0-9 in my case. Workaround 2: Activate Ctrl-Alt-Backspace (as Alt-SysRq-K has been disabled) and use that shortcut to log out from the corrupted desktop screen. Then back to a normal login screen the login works as normal both for the 3.5.0-10 and -11 kernels and even for the 3.6.0 rc1 and rc2 kernels and normal CPU-load. + Workaround 3: + Remove the grub splash option. + Not sure it's the libdrm-nouveau2 package but remember that one was introduced for DRM in the time frame for this bug. ProblemType: Bug DistroRelease: Ubuntu 12.10 Package: libdrm-nouveau2 2.4.38-0ubuntu1 ProcVersionSignature: Ubuntu 3.5.0-11.11-generic 3.5.2 Uname: Linux 3.5.0-11-generic x86_64 .tmp.unity.support.test.0: - + ApportVersion: 2.4-0ubuntu8 Architecture: amd64 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,mousepoll,wall,place,snap,move,regex,imgpng,resize,widget,gnomecompat,session,unitymtgrabhandles,animation,workarounds,fade,expo,scale,ezoom,unityshell] CompositorRunning: compiz Date: Mon Aug 20 18:40:48 2012 DistUpgraded: Fresh install DistroCodename: quantal DistroVariant: ubuntu DkmsStatus: - virtualbox, 4.1.18, 3.5.0-10-generic, x86_64: installed - virtualbox, 4.1.18, 3.5.0-11-generic, x86_64: installed - virtualbox, 4.1.18, 3.6.0-030600rc2-generic, x86_64: installed - virtualbox-guest, 4.1.18, 3.5.0-11-generic, x86_64: installed + virtualbox, 4.1.18, 3.5.0-10-generic, x86_64: installed + virtualbox, 4.1.18, 3.5.0-11-generic, x86_64: installed + virtualbox, 4.1.18, 3.6.0-030600rc2-generic, x86_64: installed + virtualbox-guest, 4.1.18, 3.5.0-11-generic, x86_64: installed EcryptfsInUse: Yes GraphicsCard: - NVIDIA Corporation GT216 [GeForce GT 330M] [10de:0a29] (rev a2) (prog-if 00 [VGA controller]) - Subsystem: Samsung Electronics Co Ltd Device [144d:c06a] + NVIDIA Corporation GT216 [GeForce GT 330M] [10de:0a29] (rev a2) (prog-if 00 [VGA controller]) + Subsystem: Samsung Electronics Co Ltd Device [144d:c06a] InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120421) MachineType: SAMSUNG ELECTRONICS CO., LTD. R580/R590 ProcEnviron: - TERM=xterm - PATH=(custom, no user) - LANG=sv_SE.UTF-8 - SHELL=/bin/bash + TERM=xterm + PATH=(custom, no user) + LANG=sv_SE.UTF-8 + SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-11-generic root=UUID=d290b749-dff5-4155-936a-23e3effc21a8 ro quiet splash ipv6.disable=1 Renderer: Software SourcePackage: libdrm UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/22/2010 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: 11JB.M044.20100622.hkk dmi.board.asset.tag: Tag 12345 dmi.board.name: R580/R590 dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr11JB.M044.20100622.hkk:bd06/22/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnR580/R590:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnR580/R590:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A: dmi.product.name: R580/R590 dmi.product.version: Not Applicable dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. version.compiz: compiz 1:0.9.8+bzr3249-0ubuntu4 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.38-0ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.4-1ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.4-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.12.99.904-0ubuntu1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.99.99~git20120713.6ef1ad6a-0ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.3-0ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.1-4~ubuntu1 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to libdrm in Ubuntu. https://bugs.launchpad.net/bugs/1039125 Title: [drm] nouveau 0000:02:00.0: PFIFO_CACHE_ERROR - Ch 2/2 Mthd 0x0800 Data 0x00000000 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1039125/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
