[Bug 28106] radeon KMS causes hardware conflict/interference with Intel wifi and audio, crashes wireless

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28106

--- Comment #22 from Øyvind Stegard <oyvinst at ifi.uio.no> 2010-05-19 15:57:27 PDT ---
I've noticed that the audio glitches become a lot worse when many windows are
open and running Compiz (I did an artificial test). I can open lots of windows
on one desktop, switch back to an empty desktop, open a single window there and
trigger audio drop-outs (simple test sound) just by toggling maximization state
of that single window, even though all the other windows are not in view and
system load is close to nil. Basically, most Compiz-operations besides simple
window movement will cause glitches.

Interestingly, I might have pushed things too far, since Compiz crashed with
this message:
drmRadeonCmdBuffer: -12. Kernel failed to parse or rejected command stream. See
dmesg for more info.

Kernel log contained this:
[  543.577306] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -12!
[  574.532539] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -12!
[  742.437808] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -12!

* This was all with radeon.disp_priority=1, cannot say whether that mattered or
not.
* Don't know the consequences of using the Ubuntu default
Xorg-driver/libdrm/DRI-stuff together with 2.6.34 mainline kernel DRM. I
haven't noticed any bad things in particular during normal usage (quite the
contrary, KMS performance with 2.6.34 seems better), except for the issues at
hand of course.
* The version of the radeon module in the default Ubuntu kernel does not have
disp_priority option.

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