[Bug 1039125] Re: [drm] nouveau 0000:02:00.0: PFIFO_CACHE_ERROR - Ch 2/2 Mthd 0x0800 Data 0x00000000

markb 1039125 at bugs.launchpad.net
Tue Sep 11 10:01:00 UTC 2012

I am running precise (with xorg-edgers ppa clearly). I didn't realise
this bug was relevant only to systems running quantal? I am seeing the
same issue but ignore my comments if not appropriate here.

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  [drm] nouveau 0000:02:00.0: PFIFO_CACHE_ERROR - Ch 2/2 Mthd 0x0800
  Data 0x00000000

Status in “libdrm” package in Ubuntu:

Bug description:
  Screen corruption occurs at start up and reboot, for
  - login screen
  - desktop screen

  - running the nouveau driver
  - 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.

  Instead of Ctrl-Alt-Backspace one can do the following:
  - Press Ctrl-Alt-F2
  - login with your username and password
  - Restart lightdm with: sudo service lightdm restart

  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

  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
   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
   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
   PATH=(custom, no user)
  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:
  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

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