[Bug 94110] New: [sna] corrupted images (horizontal lines)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94110

            Bug ID: 94110
           Summary: [sna] corrupted images (horizontal lines)
           Product: xorg
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: pavel+bzilla at pac.chapadla.cz
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 121705
  --> https://bugs.freedesktop.org/attachment.cgi?id=121705&action=edit
Screenshot 1

I often see corrupted images, most often in firefox, but also in other
applications. The corruption appears as horizontal lines, two pixels tall,
every other line has its contents shifted by 16 pixels horizontally with
respect to the adjacent line, creating a haircomb-like pattern. The problem
appears both with compiz (compositing) and marco (non-compositing) window
managers.

I am using xserver-xorg-video-intel-lts-vivid on Ubuntu trusty, package version
is 2:2.99.917-1~exp1ubuntu2.2~trusty1. Xorg.0.log says

X.Org X Server 1.17.1
Release Date: 2015-02-10
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.19.0-28-generic x86_64 Ubuntu
Current Operating System: Linux hapepa 3.19.0-49-generic #55~14.04.1-Ubuntu SMP
Fri Jan 22 11:24:31 UTC 2016 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.19.0-49-generic
root=/dev/mapper/VolGroup-ubu_mate ro quiet splash vt.handoff=7
Build Date: 11 September 2015  10:33:14AM
xorg-server 2:1.17.1-0ubuntu3.1~trusty1 (For technical support please see
http://www.ubuntu.com/support)
(...)
(--) intel(0): Integrated Graphics Chipset: Intel(R) G35

I tried to upgrade to xserver-xorg-video-intel-lts-wily (version
2:2.99.917+git20150808-0ubuntu4~trusty2), and the problem appeared even in the
login screen (lightdm). Interestingly, the problem did not appear when using
the Intel Linux graphics installer from 01.org, version 1.0.7, which had
xserver-xorg-video-intel version 2.99.911-0intel1. As my current version is
higher, I believe it could be called a regression.

Setting Option      "AccelMethod"  "uxa" in xorg.conf.d fixes it.

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