[Bug 72019] New: [HSW mobile GT3e] GpuTest v0.5 triangle fluctuate by ~45% enabling gnome-session

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72019

          Priority: medium
            Bug ID: 72019
          Assignee: idr at freedesktop.org
           Summary: [HSW mobile GT3e] GpuTest v0.5 triangle fluctuate by
                    ~45% enabling gnome-session
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/i965
           Product: Mesa

System Environment:       
----------------------------------------------
Platform: HSW mobile GT3e
Libdrm:(master)libdrm-2.4.49
Mesa:(master)90d185544c897ca0b4c3c677fed4290330bb0706
Xf86_video_intel:(master)2.99.906-28-g12e974c7bc8c85
Cairo:(master)31eff5c6eb57ad379689748fd8c60a5ffe0ba481
Libva:(staging)9aa8530ce272dc844428b7273afe7d4f0aaf391d
Libva_intel_driver: (staging)34627c96f331f7a344270c3d51b634f5f166073e
Kernel:(drm-intel-nightly) 164a4cb4c1431a0689f85507868356fae24da638

Bug detailed description:
-----------------------------------------------
GpuTest v0.5 triangle fluctuates by ~45% on HSW mobile GT3e enabling
gnome-session. It works OK with Raw X on HSW mobile. The problem doesn’t exist
on IVB/HSW-D enabling gnome-session.
It’s not a regression. The problem has existed since running GpuTest v0.5
triangle on HSW mobile GT3e.

Performance
--------------------------------------------------------------------
Test on  HSW mobile GT3e enabling gnome-session
　                         Raw X(xinit)       gnome-session
GpuTest v0.5 triangle    1330,1286,1343       1349,921,750

Reproduce steps:
---------------------------------------------
1, xinit&
2. gnome-session
3 ./GpuTest /test=triangle /width=1920 /height=1080 /fullscreen /benchmark
/no_scorebox

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