[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 #23 from Alex Deucher <agd5f at yahoo.com> 2011-11-23 10:42:03 UTC ---
Try manually setting gb_backend_map to the following values and see if any of
them help:

0x00000000
0x11111111
0x22222222
0x33333333
0x44444444
0x55555555
0x66666666
0x77777777

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