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[MvW <ubuntu@xxxxxxxxx>]

For what it's worth I still encounter this error although way less frequent.
Running 15.10 now with the 340.96 driver.

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https://bugs.launchpad.net/bugs/1258231

Title:
  10de:061f [Dell Precision M6500] NVRM: os_schedule: Attempted to yield
  the CPU while in atomic or interrupt context

Status in nvidia-graphics-drivers-331 package in Ubuntu:
  Confirmed

Bug description:
  About once an hour at least, my computer either locks up (ex. black screen) requiring me to relaunch the window manager loosing all opened X applications, or allows me to move the mouse but won't allow to click anything. Sound continues to play just fine, as do all other background tasks. Switching to TTY1 and switching back to TTY7 will mostly recover the issue by relaunching the shell. I have this issue since Ubuntu 12.10. Syslog entries:
  Dec  5 17:44:03 Europa kernel: [ 8187.092473] NVRM: os_pci_init_handle: invalid context!
  Dec  5 17:44:03 Europa kernel: [ 8187.092477] NVRM: Xid (0000:01:00): 8, Channel 00000003
  Dec  5 17:44:05 Europa kernel: [ 8189.091441] NVRM: os_schedule: Attempted to yield the CPU while in atomic or interrupt context

  WORKAROUND: running Xubuntu 12.04.3 with nvidia 331.20.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-14-generic 3.11.0-14.21
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Uname: Linux 3.11.0-14-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  mvanworkum   2639 F.... pulseaudio
   /dev/snd/controlC0:  mvanworkum   2639 F.... pulseaudio
   /dev/snd/pcmC0D0p:   mvanworkum   2639 F...m pulseaudio
  Date: Thu Dec  5 18:14:26 2013
  HibernationDevice: RESUME=UUID=d4c4f4ad-64b5-4110-b360-41660844584e
  InstallationDate: Installed on 2012-07-03 (519 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: Dell Inc. Precision M6500
  MarkForUpload: True
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic root=UUID=6600ec3d-d9d2-4333-a5ae-5849e7f58e20 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-14-generic N/A
   linux-backports-modules-3.11.0-14-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-09-06 (90 days ago)
  dmi.bios.date: 06/04/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: 0R1203
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd06/04/2013:svnDellInc.:pnPrecisionM6500:pvr:rvnDellInc.:rn0R1203:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Precision M6500
  dmi.sys.vendor: Dell Inc.

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