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[phil <philster@xxxxxxx>]

i have a similar problem on Xubuntu 15.04

[ 6567.678596] nouveau E[   PFIFO][0000:01:00.0] CACHE_ERROR - ch 4
[chromium-browse[4704]] subc 3 mthd 0x1b00 data 0x00000000

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https://bugs.launchpad.net/bugs/1239182

Title:
  Crashes in nouveau   CACHE_ERROR

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

Bug description:
  Have been running Kubuntu 13.10 beta2 for 1 day now and have had 3
  similar crashes that totally hang the machine.

  Oct 12 07:00:03 linux1 kernel: [50255.577404] nouveau E[   PFIFO][0000:01:00.0] CACHE_ERROR - ch 4 [kwin[2218]] subc 3 mthd 0x1b00 data 0x00000000
  Oct 12 07:01:20 linux1 kernel: [50333.062989] nouveau E[Xorg[1486]] failed to idle channel 0xcccc0000 [Xorg[1486]]

  Have not had any previous problems running 13.04.

  Machine is an AMD64

  Description:    Ubuntu Saucy Salamander (development branch)
  Release:        13.10

  Was not doing anything special, and in fact one crash happened while
  the machine was idle overnight.

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