[Bug 88842] New: [All bisected] etqw-demo can’t fullscreen run with maximum resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88842

            Bug ID: 88842
           Summary: [All bisected]etqw-demo can’t fullscreen run with
                    maximum resolution
           Product: xorg
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: yex.tian at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 112900
  --> https://bugs.freedesktop.org/attachment.cgi?id=112900&action=edit
Xorg info

[All bisected]etqw-demo can't fullscreen run with maximum resolution
System Environment:       
--------------------------------------------------------------
Kernel: (drm-intel-nightly)2c2cd37eb3b97bb8846ac3bf75dcb8b4948922d0
Libdrm: (master)libdrm-2.4.59-6-g28ee135a37e10b9a6cd62d67df0332e38ee0b85c
Mesa:   (master)f1a9252defb77f3986305c6a1fc9592093b5a4e5
Xserver:
(master)xorg-server-1.16.99.902-3-gdf1b401f57ad4b4925bad66684445b476562f26f
Xf86_video_intel: 
(master)2.99.917-59-gb8d52b0edd2ad6a2513d37001ee9d8f67c9acaa7
Cairo:   (master)cca8b1960b0091c53235d9dc4cde8a33010c5bbf
Libva:   (master)f9741725839ea144e9a6a1827f74503ee39946c3
Libva_intel_driver: (master)3d16cf07b6b65b9bd5c2dd855d97558264a12e79

Bug detailed description:
--------------------------------------------------
Etwq-demo can't fullscreen run with maximum resolution on all platforms, but it
passed with rest resolution.
Error information: Segmentation fault (core dumped)
Please see Xrog.

It's Xf86-intel-video regression. By bisected, the first bad commit is (master)
684e921a5.

commit 684e921a5442c0d7afedd27b7b85719d8195c6ee
Author:     Chris Wilson <chris at chris-wilson.co.uk>
AuthorDate: Thu Jan 22 15:26:00 2015 +0000
Commit:     Chris Wilson <chris at chris-wilson.co.uk>
CommitDate: Thu Jan 22 21:03:24 2015 +0000

sna/dri2: Only preserve back buffers with the same pitch

Reproduce steps:
----------------------------
1, xinit& 
2, gnome-session
3, vbank_mode=0 ./etqw.x86 +set sys_VideoRam 64 +set  r_mode -1 +set in_tty 0
+exec etqw-pts.cfg +set r_customWidth 1920 +set r_customHeight 1080
+vid_restart

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