My Ubuntu 12.04.3 PC seizes up every 2 or 3 days, forcing a reboot. But, today 
it just reported an error and continued working and then encountered the same 
error again, as shown in syslog:
  :
Oct 18 11:41:01 Zoraida NetworkManager[899]: <info> Activation (eth0) Stage 4 
of 5 (IPv6 Configure Timeout) complete.
Oct 18 12:02:40 Zoraida kernel: [108868.381667] [drm] nouveau 0000:01:00.0: 
PGRAPH - DATA_ERROR XY_OUT_OF_BOUNDS
Oct 18 12:02:40 Zoraida kernel: [108868.381671] [drm] nouveau 0000:01:00.0: 
PGRAPH - DATA_ERROR
Oct 18 12:02:40 Zoraida kernel: [108868.381674] [drm] nouveau 0000:01:00.0: 
PGRAPH - ch 4 (0x0001840000) subc 7 class 0x5039 mthd 0x0328 data 0x00000000
Oct 18 12:02:40 Zoraida kernel: [108868.667792] [drm] nouveau 0000:01:00.0: 
PGRAPH - DATA_ERROR XY_OUT_OF_BOUNDS
Oct 18 12:02:40 Zoraida kernel: [108868.667796] [drm] nouveau 0000:01:00.0: 
PGRAPH - DATA_ERROR
Oct 18 12:02:40 Zoraida kernel: [108868.667800] [drm] nouveau 0000:01:00.0: 
PGRAPH - ch 4 (0x0001840000) subc 7 class 0x5039 mthd 0x0328 data 0x00000000
 :
Oct 18 13:32:36 Zoraida ntpdate[9767]: adjust time server 75.157.237.26 offset 
-0.038743 sec
Oct 18 13:32:42 Zoraida NetworkManager[899]: <info> (eth0): IP6 addrconf timed 
out or failed.
Oct 18 13:32:42 Zoraida NetworkManager[899]: <info> Activation (eth0) Stage 4 
of 5 (IPv6 Configure Timeout) scheduled...
Oct 18 13:32:42 Zoraida NetworkManager[899]: <info> Activation (eth0) Stage 4 
of 5 (IPv6 Configure Timeout) started...
Oct 18 13:32:42 Zoraida NetworkManager[899]: <info> Activation (eth0) Stage 4 
of 5 (IPv6 Configure Timeout) complete.
Oct 18 13:39:00 Zoraida kernel: [113295.850731] [drm] nouveau 0000:01:00.0: 
PGRAPH - DATA_ERROR XY_OUT_OF_BOUNDS
Oct 18 13:39:00 Zoraida kernel: [113295.850745] [drm] nouveau 0000:01:00.0: 
PGRAPH - DATA_ERROR
Oct 18 13:39:00 Zoraida kernel: [113295.850757] [drm] nouveau 0000:01:00.0: 
PGRAPH - ch 4 (0x0001840000) subc 7 class 0x5039 mthd 0x0328 data 0x00000000
Oct 18 13:39:01 Zoraida CRON[9833]: (root) CMD (  [ -x 
/usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ 
-depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! 
-execdir fuser -s {} 2>/dev/null \; -delete)
Oct 18 13:41:42 Zoraida kernel: [113457.911427] [drm] nouveau 0000:01:00.0: 
PGRAPH - DATA_ERROR XY_OUT_OF_BOUNDS
Oct 18 13:41:42 Zoraida kernel: [113457.911439] [drm] nouveau 0000:01:00.0: 
PGRAPH - DATA_ERROR
Oct 18 13:41:42 Zoraida kernel: [113457.911451] [drm] nouveau 0000:01:00.0: 
PGRAPH - ch 4 (0x0001840000) subc 7 class 0x5039 mthd 0x0328 data 0x00000000
Oct 18 13:43:15 Zoraida kernel: [113551.028120] [drm] nouveau 0000:01:00.0: 
PGRAPH - DATA_ERROR XY_OUT_OF_BOUNDS
Oct 18 13:43:15 Zoraida kernel: [113551.028133] [drm] nouveau 0000:01:00.0: 
PGRAPH - DATA_ERROR
Oct 18 13:43:15 Zoraida kernel: [113551.028146] [drm] nouveau 0000:01:00.0: 
PGRAPH - ch 4 (0x0001840000) subc 7 class 0x5039 mthd 0x0328 data 0x00000000
 :

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-nouveau in Ubuntu.
https://bugs.launchpad.net/bugs/874672

Title:
  Xorg compiz / unity crash with nouveau

Status in “xserver-xorg-video-nouveau” package in Ubuntu:
  Confirmed

Bug description:
  After editing something in CCSM the unity dash and panels quit and compiz 
segfaults - i can restore desktop usability 
  with 
  DISPLAY=:0.0 compiz --replace &
  an tty1 (ctrl-alt-f1)

  After 
  unity --replace
  in a terminal window on the "repared" session , the screen corrupts again 
(requiring compiz --replace)

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: xorg 1:7.6+7ubuntu7
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic i686
  .tmp.unity.support.test.0:
   
  ApportVersion: 1.23-0ubuntu3
  Architecture: i386
  CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,resize,compiztoolbox,imgpng,regex,mousepoll,gnomecompat,wall,place,animation,workarounds,move,session,snap,vpswitch,grid,expo,ezoom,staticswitcher,fade,scale,unityshell]
  CompositorRunning: compiz
  Date: Sat Oct 15 00:46:22 2011
  DistUpgraded: Log time: 2011-10-14 16:34:35.467033
  DistroCodename: oneiric
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   nVidia Corporation C77 [GeForce 8200] [10de:0849] (rev a2) (prog-if 00 [VGA 
controller])
     Subsystem: nVidia Corporation Device [10de:cb84]
  MachineType: nknow Unknow
  ProcEnviron:
   PATH=(custom, user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: root=UUID=5ea65807-deec-4499-818f-3824159f2d62 ro 
libata.force=noncq
  SourcePackage: xorg
  Symptom: display
  Title: Xorg crash
  UpgradeStatus: Upgraded to oneiric on 2011-10-14 (0 days ago)
  XorgConf:
   Section "Device"
   Identifier "n"
   Driver "nouveau"
   EndSection
  dmi.bios.date: 11/17/2009
  dmi.bios.vendor: Phoenix Technologies, LTD
  dmi.bios.version: 6.00 PG
  dmi.board.name: NF-MCP78
  dmi.board.vendor: nVIDIA
  dmi.chassis.type: 3
  dmi.modalias: 
dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd11/17/2009:svnnknow:pnUnknow:pvr:rvnnVIDIA:rnNF-MCP78:rvr:cvn:ct3:cvr:
  dmi.product.name: Unknow
  dmi.sys.vendor: nknow
  version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu5
  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.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 N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110411+8378443-1

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