[Intel-gfx] 5 bugs

[Chris Wilson]

On Wed, 15 Jun 2011 18:10:29 -0700, Bryce Harrington <bryce at canonical.com> wrote:
> Hi Max,
> 
> I currently am tracking 6 bug reports with the intel driver so far for
> the oneiric development cycle, of which 5 have been forwarded upstream:
> 
>   https://bugs.freedesktop.org/show_bug.cgi?id=36515

This looks to be a continuation of the WAIT_EVENT on a dead pipe that we
thought we had beaten into submission. The other reports provide more
circumstantial evidence to suggest that the hang coincides with a hotplug
event. I think the cause is a race between the kernel turning the pipe off
due to the hotplug and reprobing and that uevent reaching the ddx. In the
meantime, we've queued another video frame to execute on the dead pipe.
Worse we may have queued it up long before the hotplug event and due to
buffering in the GPU command stream it only gets executed afterwards.

commit 85345517fe6d4de27b0d6ca19fef9d28ac947c4a
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sat Nov 13 09:49:11 2010 +0000

    drm/i915: Retire any pending operations on the old scanout when switching

Handles the case were we are changing modes. Unfortunately, disabling an
output takes a different path. Though, I think we can a similar big hammer
approach there are well.

>   https://bugs.freedesktop.org/show_bug.cgi?id=37393

Doesn't look to be the typical unresolved VGA on Arrandale failure.
At first glance it suggests the misreporting of DPMS issue.

>   https://bugs.freedesktop.org/show_bug.cgi?id=37526

drm "hotplug" polling claims another victim. Daniel last volunteered to
fix drm locking, which will help the general symptoms of a stall every
10s, but doesn't root cause the blanking.

>   https://bugs.freedesktop.org/show_bug.cgi?id=28798

I've fixed all the rendering issues I could find for sna. The best
solution I can see to fix uxa is to remove the attempts to get it to use
the 3D pipeline for core rendering routines.

>   https://bugs.freedesktop.org/show_bug.cgi?id=38191

Tiling artefacts, haven't investigated ff5 yet, so I've no idea where
the issues lies or if it is a reoccurrence of a much older GM45 tiling
bug under compiz.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre