[Bug 66491] New: [HSW bisected]screen black when start gnome-session enabling SNA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66491

          Priority: medium
            Bug ID: 66491
          Assignee: chris at chris-wilson.co.uk
           Summary: [HSW bisected]screen black when start gnome-session
                    enabling SNA
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: pengcheng.jiang at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

system Environment:
--------------------------
platform: HSW 
Mesa:(master)4c859901cebf04b37d8d458d58fc5ac0e24b4471
Xf86_video_intel:(master)2.21.11-12-g24a7bec7faa7dcc4393ef7f66939ae0fb8acdf36
Kernel:    (drm-intel-nightly) 4650ba773f66c31ee17f87a8ffd715465a2cab05

hardware:
--------------
Shark Bay Desktop Beta SDP (Flathead Creek): C3 stepping (id=0x0412, rev 06),
Lynx Point 02 (B0 stepping) and Host bridge id=0x0c00 (rev 06) 4Cores/4Thread,
CPU i5-4570 3.2GHz, GT2 1150MHz; BIOS version: V120; KSC version: V1.10;
Barcode: BB001794;

Bug detailed description:
-------------------------
Screen black when start gnome-session, enabling SNA on HSW. It doesn't exist
without SNA. Pls see Xorg.0.log and dmesg attached.
It's Xf86_video_intel regression, bisected show that:
  The first bad commit could be any of:
  8a6a21bff86100144ba7960fc32a299ac54ada83 
  c5651254c3c152daf1ed79073779c1bed6ed0a9b

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

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