Steam UI and Dota2 loading screen have black tiles in them, attached screenshot tells more than words.
Tested this on HSW machine, 64bit Ubuntu 14.04 and 32bit Mesa (dota2 is 32bit)
Bisected to following commit:
--- 8< ---
Author: Kristian Høgsberg <firstname.lastname@example.org>
Date: Mon Jul 7 16:44:58 2014 -0700
i965: Implement fast color clears using meta operations
This patch uses the infrastructure put in place by previous patches
to implement fast color clears and replicated color clears in terms of
This works all the way back to gen7 where fast clear was introduced and
adds support for fast clear on gen8. It replaces the blorp path
completely and improves on a few cases. Layered clears are now done
using instanced rendering and multiple render-target clears use a
MRT shader with rep16 writes.
Signed-off-by: Kristian Høgsberg <email@example.com>
Acked-by: Kenneth Graunke <firstname.lastname@example.org>
Created attachment 104809 [details]
steam ui screenshot
Created attachment 104810 [details]
dota loading screenshot
Is also visible in Synmark's Batch* tests, so this can be trivially caught by its validation. Besides the vertical stripes, there's also noise visible in some of the triangles, so there might be even couple of separate issues.
Happens only on HSW (GT3e), not on IVB or BYT.
We tried with Curro on HSW GT2 and did not reproduce the errors (using Synmark tests).
I'm not seeing issues listed in this bug anymore , but bug 82796 issue (with Synmark CPU<->GPU communication terrain tests) still remains.
 Maybe fixed by: e6a53533b7aa790f66b044f77deaac450aa39fde
Tapani, what about you, can this be set as fixed?
*** Bug 82891 has been marked as a duplicate of this bug. ***