ubuntu-x-swat team mailing list archive

[Rob van der Linde <829086@xxxxxxxxxxxxxxxxxx>]

We got an email back from Intel, the issue was fixed in Keith's drm-
intel-next kernel branch and heading upstream.

Apparently it's a clock gating issue on Sandybridge.

As a temporary fix, if you have intel-gpu-tools, you can run:

sudo intel_reg_write 0x9404 0x1800

For me it seems to have fixed the issue, I am running our software
through a test now and so good so far.

For reference, the two commits are:

commit 9ca1d10d748e56964de95e3ed80211b192f56cf4
Author: Eric Anholt <eric@xxxxxxxxxx>
Date:   Mon Nov 7 16:07:05 2011 -0800

   drm/i915: Turn on another required clock gating bit on gen6.

   Unlike the previous one, I don't have known testcases it fixes.  I'd
   rather not go through the same debug cycle on whatever testcases those
   might be.

   Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
   Cc: stable@xxxxxxxxxx
   Signed-off-by: Keith Packard <keithp@xxxxxxxxxx>

commit 406478dc911e16677fbd9c84d1d50cdffbc031ab
Author: Eric Anholt <eric@xxxxxxxxxx>
Date:   Mon Nov 7 16:07:04 2011 -0800

   drm/i915: Turn on a required 3D clock gating bit on Sandybridge.

   Fixes rendering failures in Unigine Tropics and Sanctuary and the mesa
   "fire" demo.

   Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
   Cc: stable@xxxxxxxxxx
   Signed-off-by: Keith Packard <keithp@xxxxxxxxxx>

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https://bugs.launchpad.net/bugs/829086

Title:
  Artifacts in 3D with Sandy Bridge

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