[Bug 39282] radeon HD6790 (barts) card produces black+white horizontal stripes on screen when launching Xorg

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=39282

--- Comment #24 from Florian Evers <florian-evers at gmx.de> 2011-11-24 01:25:02 PST ---
Hi Alex,

thanks again, and now it seems that we are on the right track!

My test results:

0x00000000
0x22222222
0x44444444
0x66666666
-> All these result in immediate lockups.

0x11111111
0x33333333
0x55555555
0x77777777
-> All these result in a correctly started X server :-D
With any of these settings, kdm started correctly, and I was able to log in
(KDM->KDE 4.7.3).

0x33333333:
using this setting, I saw another late lockup in combination with a total
system freeze while testing some apps. I have a copy of the lockup message here
(before the system hung up), but it looks quite similar than the others in this
thread, perhaps with some different hex numbers.

0x11111111 and
0x55555555 and
0x77777777:
-> These are not locking the GPU or crashing the system immediately, but this
would require more testing to be sure. Unfortunately, 

0x11111111:
This setting produced lots of glitches regarding transparency. The taskbar was
invisible, just the icons were rendered. Would not recommend to use that.

0x55555555 and
0x77777777:
No crashes, no lockups, NEARLY perfect. There are some minor gliches with
transparency, that appear if you active a context menu (right mouse button).
Then, you only see the icons and the text, but not the window itself. If you
hover the mouse over it (to trigger repainting), than the window appears as
well. glxgears works.

Nice. I'm seeing a light at the end of the tunnel :-)
Great... many thanks... now lets finalize this. Currently I'm working with
setting 0x55555555... ignoring the glitches, I'm already able to use the
system! :-D

Regards,
Florian

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