[Bug 71431] radeon graphics stopped working since kernel 3.10 on AMD a4-3300

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71431

--- Comment #1 from ka.nick at mail.ru ---
Created attachment 88936
  --> https://bugs.freedesktop.org/attachment.cgi?id=88936&action=edit
dmesg output

X11 doesn't work on my dual-graphics AMD laptop with kernels 3.10.X - 3.12.X,
on 3.9.X and earlier kernels does.
Upon startup lxdm shows a garbage instead of normal picture (but the colors are
from the picture), X restarts every few seconds, but kernel itself works fine -
I can ssh into the comp or restart using the magic key.
Have been trying different combinations: EXA/Glamor, various xorg options with
basically the same result: in some cases I can see the normal working mouse
over the garbage, in some cases I get "GPU stall" message in dmesg, or EQ
overflow in Xorg.0.log...
R600_DEBUG=sdsafemath - improves a picture a bit;
ColorTiling off - makes things even better - in this case about 70% of the
screen are drawn correctly, but at wrong position on the screen;
NoAccel on - works as with 3.9.X kernel - windows and lxdm screen - ok,
background with errors.

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