[Bug 81898] [bdw false-bisect] Xf86 causes glxgears issue

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81898

yaoming <ming.yao at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #2 from yaoming <ming.yao at intel.com> ---
[BDW Bisected] Glxgears issue
----------------------------------------------

==System Environment==
--------------------------
Platform: BDW
 Libdrm:(master)libdrm-2.4.54-9-g8fc62ca8ac010659023bb63c4759eb683de4f9af
 Mesa:(master)84e0a5c406f2a8f060352eaa4b5c138e3f1a5a86

Xserver:(master)xorg-server-1.15.99.902-97-gdb2e708f31a162c6c66643d3559dd5f3e21ee06b

Xf86_video_intel:(master)2.99.911-225-gffbe0aa1851c35cc2403633ca493e9fc6a471fd4
 Cairo:(master)ead5c7909f3db1d0d81121fc2775c458871891b2
 Libva:(staging)35e70cb9b9c77dfb99fb370e319ed501f0c31b17
 Libva_intel_driver:(staging)fbbe401aa28a0b3859d587ef08f0df15a2f7c8f2
 Kernel:(drm-intel-nightly) 164a4cb4c1431a0689f85507868356fae24da638

Bug detailed description:
----------------------------------------------
The problem exists both on gnome-session and Raw X.
And it show different issues with SNA on and off: glxgears show black when SNA
on and very jitter when SNA off.
It’s Xf86 regression, bisecting show that the first bad commit is:

commit 1618d6cfa63e31ebaedadf575dcbdf5b07451bde
Author:     Chris Wilson <chris at chris-wilson.co.uk>
AuthorDate: Fri May 30 12:14:40 2014 +0100
Commit:     Chris Wilson <chris at chris-wilson.co.uk>
CommitDate: Mon Jun 2 08:32:10 2014 +0100

    sna/gen8: Set GT level

    We use the GT level to decide how favourable it is to use the GPU in
    various circumstances, now set it.

Signed-off-by: Chris Wilson chris at chris-wilson.co.uk


Reproduce steps:
---------------------------------------------
1.    xinit &
2.    gnome-session &
3.      glxgears &

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