Created attachment 69978 [details]
Xorg.0.log low on mesa 7139ab80

System Environment:       
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Libdrm: (master)libdrm-2.4.40-1-g7d42b49c0cf19dbb4531cd84efae51f95db2eea1
Mesa:  (master)557d4918adf4cb99c4410af3bdf51c5eb3fc1d17
Xserver: (master)xorg-server-1.13.0-135-g011f8458805e443ac9130865d2840a929a00ca
Kernel:  (drm-intel-nightly)c8ce1525e1334abb222d6233d7d3698f6c7dab2c


Bug detailed description:
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Unigine-sanctuary reduced much ~98% on IronLake.
It’s Mesa regression, by bisected show that the first bad commit is 7139ab80.

commit 7139ab80ca9b1b3572ef6da98765ca783e8e5e3b
Author: Eric Anholt <eric@anholt.net>
Date:   Wed Aug 8 09:03:26 2012 -0700
     i965: Fix rendering to small mipmaps of depth/stencil buffers using a temp mt. 

            fps
5c8dd6cf7   6.3
7139ab80    0.09   

Reproduce steps:
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1, xinit&
2, vblank_mode=0 ./Sanctuary -video_app opengl -data_path ../ -sound_app null -system_script sanctuary/unigine.cpp -engine_config ../data/unigine.cfg -video_mode -1 -video_fullscreen 1 -extern_define PHORONIX -video_width 1024 -video_height 768