[Bug 81973] New: xf86-video-intel-2.99.912 and newer causing flickering on game.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81973

          Priority: medium
            Bug ID: 81973
          Assignee: chris at chris-wilson.co.uk
           Summary: xf86-video-intel-2.99.912 and newer causing flickering
                    on game.
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: kirkpuppy at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Created attachment 103759
  --> https://bugs.freedesktop.org/attachment.cgi?id=103759&action=edit
Xorg Log

Hi,

With anything newer than xf86-video-intel-2.99.911 including today's git, I get
random flickering on parts of the screen while playing Urban_Terror-4.2. I've
tried using glamor, sna, and uxa, no difference. I bisected it to this commit:

# git bisect bad
8369166349c92a20d9a2e7d0256e63f66fe2682b is the first bad commit
commit 8369166349c92a20d9a2e7d0256e63f66fe2682b
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jun 4 08:29:51 2014 +0100

    sna/dri2: Enable immediate buffer exchanges

    The primary benefit of this is avoid the extra blit when using a
    compositor and instead propagate the compositor flip on the frontbuffer
    to the scanout, or equivalently allows a fullscreen game to flip onto
    the scanout without intervention by TearFree.

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

:040000 040000 dfbc6f4995687fd29ebe5072c432fc951449c977
22f8ea8ed349d4ce0e37115a5aa24856321857e0 M    src
# 

I'm using the following:

i5-3340m
Linux-3.15.5
Mesa-10.2.4
Xorg-server-1.15.2

I'm not using a compositing window manager. I'm using Openbox or JWM.

I configured with:

# ./configure --prefix=/usr --libdir=/usr/lib64 --enable-kms-only
--with-default-accel=sna --enable-glamor

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