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The machine's (Dell Precision M6500, core i7, nVidia Quadro FX 3800M) interface 
frequently (once an hour at least) locks up. The mouse almost always functions 
fine but won't allow to click anything, it does however locks up sometimes as 
well.
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. Unfortunately it also results in a black screen from time to time, 
leaving nothing but to relaunch the window manager loosing all opened X 
applications. I have this issue since Ubuntu 12.10 and have failed finding any 
solution for it. Have tried numerous Kernels and nVidia drivers to no avail.

Syslog entries:
Dec  5 17:44:03 Europa kernel: [ 8187.092411] NVRM: os_pci_init_handle: invalid 
context!
Dec  5 17:44:03 Europa kernel: [ 8187.092451] NVRM: os_pci_init_handle: invalid 
context!
Dec  5 17:44:03 Europa kernel: [ 8187.092454] NVRM: os_pci_init_handle: invalid 
context!
Dec  5 17:44:03 Europa kernel: [ 8187.092455] NVRM: os_pci_init_handle: invalid 
context!
Dec  5 17:44:03 Europa kernel: [ 8187.092458] NVRM: os_pci_init_handle: invalid 
context!
Dec  5 17:44:03 Europa kernel: [ 8187.092462] NVRM: os_pci_init_handle: invalid 
context!
Dec  5 17:44:03 Europa kernel: [ 8187.092464] NVRM: os_pci_init_handle: invalid 
context!
Dec  5 17:44:03 Europa kernel: [ 8187.092466] NVRM: os_pci_init_handle: invalid 
context!
Dec  5 17:44:03 Europa kernel: [ 8187.092467] NVRM: os_pci_init_handle: invalid 
context!
Dec  5 17:44:03 Europa kernel: [ 8187.092469] NVRM: os_pci_init_handle: invalid 
context!
Dec  5 17:44:03 Europa kernel: [ 8187.092470] NVRM: os_pci_init_handle: invalid 
context!
Dec  5 17:44:03 Europa kernel: [ 8187.092472] NVRM: os_pci_init_handle: invalid 
context!
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.

** Affects: nvidia-graphics-drivers-331 (Ubuntu)
     Importance: Low
         Status: New


** Tags: amd64 apport-bug kernel-bug-exists-upstream kernel-da-key 
latest-bios-a10 needs-upstream-testing quantal raring regression-potential saucy
-- 
10de:061f [Dell Precision M6500] NVRM: os_schedule: Attempted to yield the CPU 
while in atomic or interrupt context
https://bugs.launchpad.net/bugs/1258231
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