compiz team mailing list archive

[Chris Halse Rogers <raof@xxxxxxxxxx>]

That looks to me awfully like an entirely idle gpu.

My hypothesis is that the driver has missed the vblank interrupt, so the
MSC compiz is waiting on will never be raised.

Could you please add ‘drm.debug=0x1’ to your kernel command line and
attach dmesg next time this happens?  That should spit out appropriate
messages to debug this.

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https://bugs.launchpad.net/bugs/740126

Title:
  compiz hangs randomly several times per day