[Bug 74203] New: Window corruption on dual-GPU (integrated+discrete) Radeon setup in GNOME 3.8

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74203

          Priority: medium
            Bug ID: 74203
          Assignee: xorg-driver-ati at lists.x.org
           Summary: Window corruption on dual-GPU (integrated+discrete)
                    Radeon setup in GNOME 3.8
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: infinity_d at elitemail.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/Radeon
           Product: xorg

Created attachment 93022
  --> https://bugs.freedesktop.org/attachment.cgi?id=93022&action=edit
Xorg.0.log with EXA

I have two GPUs in my Gentoo Linux setup: a Radeon HD 7560D (ARUBA) integrated
into an AMD A8-5600K APU (Trinity), and a discrete Radeon HD 7570 (TURKS), both
of which are plugged into an ASUS F2A85-M PRO motherboard. I'm running a
3.10.25 kernel, xorg-server-1.14.3-r2, and xf86-video-ati 7.2.0, with the GNOME
3.8 desktop environment installed. These are all the most recent stable
versions in Gentoo.

The issue is window corruption occurring when I open programs. I've attached
three example images. One depicts the drop shadow that normally appears around
a window border, but none of the window's contents. The other two show windows
with corrupted contents, one with bits of the desktop background, and the other
with discolored application icons from the activities menu. Note that this
occurs in a GNOME session that is otherwise normal: the taskbar at the top of
the screen and the activities menu operate normally, the desktop wallpaper is
unaffected, and I can close and move open windows using their titlebars, which
suggests I could possibly use the programs normally, but without any visual
feedback. Some of the of the noise and artifacts appearing in corrupted windows
also appear on the display at boot immediately prior to the GNOME login screen,
which itself looks normal.

This occurs when my display(s) are plugged into the motherboard, i.e. running
on the 7560D, and when the acceleration method is set to glamor. With EXA, no
such issue occurs.

The problem I have is similar to the one detailed in an Ubuntu Forums post
(http://ubuntuforums.org/showthread.php?t=2180826) and alluded to in bug 70409
(filed by the author of the forum post). Our setups are slightly different: he
encountered the problem on a laptop with both an integrated and a discrete GPU
and on a desktop with two discrete GPUs; my system is a desktop with integrated
and discrete GPUs.

Steps to reproduce:
1. Set AccelMethod to glamor in xorg.conf.
2. Install discrete GPU.
3. Connect display(s) to integrated GPU.
4. Boot system.
5. Login to GNOME.
6. Open any program.

Expected results:
Program appears normally.

Actual results:
Program window is corrupted.

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