Bug 37090

System Environment:
--------------------------
Platform:  Sugarbay(GT1)
Libdrm:    (master)2.4.25
Mesa:      (master)7074801ed7da5d4da71ed9fb41c4b54681f91854
Xserver:	   (master)xorg-server-1.10.0-313-g5cb31cd0cbf83fff5f17a475e7b0e45246b19bf3
Xf86_video_intel:(master)2.15.0-7-g3145530feed879082bcfab11ffc8e7fd0911c920
Cairo:  (master)b1c96f18526ad09f8a972feecaefe465c61307b5
Libva:  (master)0cfff4e0189efd46ec5a29dc3e11b8388ae67b00
Kernel: (drm-intel-fixes) dabc8ce34938f9fa2929f51d9fab730e78bd2184

Bug detailed description:
-------------------------
on desktop,GPU hang running 3DMMES/taijion on a Sugarbay(GT1) when its resolution isn't Maximum.Pls see attached dmesg.
Specifically:
1.It's Ok when running on the Maximum resolution.
2.It works fine on Sugarbay(GT2) and Huronriver.
3.It's kernel regression.By bisected,show that
a1656b9090f7008d2941c314f5a64724bea2ae37 is the first bad commit.
4.It's OK when add "i915.semaphores=1" in grub.conf with the commit a1656b9090.
 But it's still bad when add "i915.semaphores=1" in grub.conf with the commit dabc8ce349.

commit a1656b9090f7008d2941c314f5a64724bea2ae37
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Fri Mar 4 18:48:03 2011 +0000

    drm/i915: Disable GPU semaphores by default

    Andi Kleen narrowed his GPU hangs on his Sugar Bay (SNB desktop) rev 09
    down to the use of GPU semaphores, and we already know that they appear
    broken up to Huron River (mobile) rev 08. (I'm optimistic that disabling
    GPU semaphores is simply hiding another bug by the latency and
    side-effects of the additional device interaction it introduces...)

    However, use of semaphores is a massive performance improvement... Only
    as long as the system remains stable. Enable at your peril.

    Reported-by: Andi Kleen <andi-fd@firstfloor.org>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=33921
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>


Reproduce steps:
-------------------------
1.xinit&
2.gnome-session
2.LD_LIBRARY_PATH=lib:$LD_LIBRARY_PATH ../src/common/fm_oes_player/fm_oesplayer
(make sure:resolution less than the maximum resolution)