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

[Bowmore]

I made some further investigations for the nouveau driver today.

Kernels  3.5.0-10 to 3.5.0-12:
The issue is present with a corrupted screen and massive logging of PFIFO_CACHE_ERROR messages.

Kernel 3.5.0-13
The issue seems gone, i.e the nouveau driver again!

It seems that the fixes for kernel 3.5.0-13 (two bugs) also fixed this issue!
My guess is the framebuffer recycling issue being fixed.

The issue also is present in kernel 3.6, but never mind as 3.5 will be
shipped for Quantal.

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

Status in “libdrm” package in Ubuntu:
  Confirmed

Bug description:
  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

  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
  .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
  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]
  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
  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

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