[Nouveau] [Bug 71659] [NVD9] Hangs under load with ![ PFIFO][0000:01:00.0] unhandled status 0x00800000

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71659

--- Comment #23 from Rebecca Palmer <R.Palmer at bham.ac.uk> ---
Created attachment 101990
  --> https://bugs.freedesktop.org/attachment.cgi?id=101990&action=edit
kernel log 3.15rc-Jun-27

This bug still exists in drm-nouveau-next (commit
242a42eadfc17448a0d5b2ffc0cb191c8b51971a) with Ubuntu 14.04 userspace.  The
error message has changed to "E[   PFIFO][0000:01:00.0] INTR 0x00800000", and
some of the "INTR 0x01000000: 0x00000005" warnings now come _after_ it.

In Ubuntu 14.04 (not 13.10) with either this git kernel or its standard 3.13,
there is also a hang on resume from suspend
(https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1333417),
but it is not clear whether this is a driver or BIOS problem.

In the attached, the original bug is at 08:09:47 and 08:20:06, the resume
failure (which can log "GPU lockup", "failed to idle chanel 0xcccc0001
[Xorg[1185]]", or nothing) is at 08:14:53.

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