Patches sent to kernel-team mailing list.

** Description changed:

+ SRU Justification
+ 
+ Impact: Mouse cursor disappears after some time of using the nouveau
+ driver on a computer with NV50 graphics
+ 
+ Fix: Backport of upstream workaround that avoids using the last 32 bytes
+ of the evo ring buffer.
+ 
+ Test case: Verified with natty on LP #583760.
+ 
+ ---
+ 
  Suddenly my mouse cursor dissappeared.
  
  I got this error in the logs:
  2010-05-21T13:48:37.658810+02:00 malbec.vineyard.sikkerhed.org kernel: [ 
8011.646410] [drm] nouveau 0000:01:00.0: EvoCh 0 Mthd 0x0000 Data 0x00000400 
(0x0002 0x01)
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: libdrm-nouveau1 2.4.18-1ubuntu3
  ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-22-generic i686
  Architecture: i386
  Date: Fri May 21 13:50:02 2010
  DkmsStatus:
-  virtualbox-ose, 3.1.6, 2.6.32-21-generic, i686: installed 
-  virtualbox-ose, 3.1.6, 2.6.32-22-generic, i686: installed
+  virtualbox-ose, 3.1.6, 2.6.32-21-generic, i686: installed
+  virtualbox-ose, 3.1.6, 2.6.32-22-generic, i686: installed
  GdmLog:
-  Error: command ['kdesudo', '--', 'cat', '/var/log/gdm/:0.log'] failed with 
exit code 1: QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch 
failed: No such file or directory
-  QFileSystemWatcher: failed to add paths: /home/tdn/.config/ibus/bus
-  Bus::open: Can not get ibus-daemon's address. 
-  IBusInputContext::createInputContext: no connection to ibus-daemon 
-  cat: /var/log/gdm/:0.log: No such file or directory
+  Error: command ['kdesudo', '--', 'cat', '/var/log/gdm/:0.log'] failed with 
exit code 1: QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch 
failed: No such file or directory
+  QFileSystemWatcher: failed to add paths: /home/tdn/.config/ibus/bus
+  Bus::open: Can not get ibus-daemon's address.
+  IBusInputContext::createInputContext: no connection to ibus-daemon
+  cat: /var/log/gdm/:0.log: No such file or directory
  GdmLog1: Error: command ['kdesudo', '--', 'cat', '/var/log/gdm/:0.log.1'] 
failed with exit code 1: cat: /var/log/gdm/:0.log.1: No such file or directory
  GdmLog2: Error: command ['kdesudo', '--', 'cat', '/var/log/gdm/:0.log.2'] 
failed with exit code 1: cat: /var/log/gdm/:0.log.2: No such file or directory
  InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100427)
  MachineType: LENOVO 6460D8G
  PccardctlIdent:
-  Socket 0:
-    no product info available
+  Socket 0:
+    no product info available
  PccardctlStatus:
-  Socket 0:
-    no card
+  Socket 0:
+    no card
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-22-generic 
root=/dev/mapper/hostname-root ro quiet splash
  ProcEnviron:
-  LANGUAGE=
-  PATH=(custom, user)
-  LANG=en_DK.UTF-8
-  SHELL=/bin/zsh
+  LANGUAGE=
+  PATH=(custom, user)
+  LANG=en_DK.UTF-8
+  SHELL=/bin/zsh
  SourcePackage: libdrm
  dmi.bios.date: 11/14/2008
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7LETC5WW (2.25 )
  dmi.board.name: 6460D8G
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvr7LETC5WW(2.25):bd11/14/2008:svnLENOVO:pn6460D8G:pvrThinkPadT61p:rvnLENOVO:rn6460D8G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 6460D8G
  dmi.product.version: ThinkPad T61p
  dmi.sys.vendor: LENOVO
  system:
-  distro:             Ubuntu
-  codename:           lucid
-  architecture:       i686
-  kernel:             2.6.32-22-generic
+  distro:             Ubuntu
+  codename:           lucid
+  architecture:       i686
+  kernel:             2.6.32-22-generic

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https://bugs.launchpad.net/bugs/583760

Title:
  [PATCH] Mouse cursor dissappears with nouveau

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