[Bug 101691] gfx corruption on windowed 3d-apps running on dGPU

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=101691

--- Comment #36 from Ethan Hsieh <ethan.hsieh@canonical.com> ---
Based on AMD's comment (The issue is gone without Compiz), I did some tests.

Here is the test result:
-----------------------------------
1) Run glxgears without a desktop environment
-----------------------------------
a. Logout
b. Switch to tty1
c. Stop lightdm and then start x
$ service lightdm stop
$ startx
d. Run glxgears

AC mode:
$ DRI_PRIME=1 glxgears -info
=> corruption issue is gone, but it is back when I touch touchpad.
Video: https://goo.gl/8p26HZ
Besides the corruption issue, sometimes the gear stopped when I touched the
touchpad.

DC mode:
$ DRI_PRIME=1 glxgears -info
=> Pass!!
-----------------------------------
2) Run glxgears with other window manager
-----------------------------------
a. Install TWM
$ sudo apt-get install twm
$ sudo apt-get install afterstep
b. Logout and then login with twm
c. Run glxgears

AC mode:
$ DRI_PRIME=1 glxgears -info
=> corruption issue is gone, but it is back when I touch touchpad.
Video: https://goo.gl/8p26HZ
Besides the corruption issue, sometimes the gear stopped when I touched the
touchpad.

DC mode:
$ DRI_PRIME=1 glxgears -info
=> Pass!!

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