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 <e...@anholt.net> 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 <e...@anholt.net> Cc: sta...@kernel.org Signed-off-by: Keith Packard <kei...@keithp.com> commit 406478dc911e16677fbd9c84d1d50cdffbc031ab Author: Eric Anholt <e...@anholt.net> 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 <e...@anholt.net> Cc: sta...@kernel.org Signed-off-by: Keith Packard <kei...@keithp.com> -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/829086 Title: Artifacts in 3D with Sandy Bridge To manage notifications about this bug go to: https://bugs.launchpad.net/mesa/+bug/829086/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
