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[Stephan <620478@xxxxxxxxxxxxxxxxxx>]

Update: I gave it another chance after finding bug 526857 comment 5.
I applied that workaround and the machine has been running now for
a few hours without crash nor freeze. 

I still had a few 
  NVRM: Xid (0007:00): 6, PE0001
which did not correlate to any observable freeze/flicker, then:
Aug 21 18:19:49 luna kernel: [ 5907.594173] NVRM: Xid (0007:00): 3, C 00000001 SC 00000002 M 00000860 Data ffffff78
Aug 21 19:06:59 luna kernel: [ 8736.997129] NVRM: Xid (0007:00): 3, C 00000001 SC 00000002 M 000002ac Data 00000004
Aug 21 19:07:03 luna kernel: [ 8741.289690] NVRM: Xid (0007:00): 3, C 00000001 SC 00000002 M 000002ac Data 00000004
Aug 21 19:07:07 luna kernel: [ 8745.370445] NVRM: Xid (0007:00): 3, C 00000001 SC 00000002 M 000002ac Data 00000004
which caused a flicker and a temporary freeze. The time between
log-entries could well be equal to the time of the freeze.

-- 
xorg crashes randomly with seg fault
https://bugs.launchpad.net/bugs/620478
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