[Bug 47519] Xorg hangs in ioCtl in path of RADEONDownloadFromScreenCS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=47519

--- Comment #9 from Torsten Krah <tkrah at fachschaft.imn.htwk-leipzig.de> 2012-03-20 04:59:37 PDT ---
> (In reply to comment #4)
> > If i remove those config or set all to "on" it happens really frequently
> > (enough to make me report this one here to seek help :-) ).
> 
> Option "AccelDFS" has no effect with KMS (the log file incorrectly claims
> otherwise). It might be interesting to narrow down which of the other three
> options really make a difference for you. My first guess would be page
> flipping.

Ok - it happens too with all of them off. But yes, it feels like page flipping.

> 
> 
> (In reply to comment #5)
> > dmesg
> 
> Did you capture this after a hang occurred? If so, it looks like we can rule
> out the hangs being due to GPU lockups.

Yes i'll take it after the hang. It did hang too today again with all options
off. dmesg is similar. And the trace if got after hanging is the same as in
47512 - so yes it looks like the same.
Should other one be marked as duplicate?

> 
> Does booting with radeon.msi=0 on the kernel command line work around the
> problem?

I'll try it (with all options on again) and will report.

> 
> 
> (In reply to comment #7)
> > I suffer this one since i'll changed from lucid to oneiric, where gnome2 was
> > removed and i did switch to gnome3.
> 
> Was lucid even using KMS yet?

With backported kernel if was possible afaik. But this comment was about that i
don't know if its a regression. So it should not matter at all.

> 
> 
> > Because it did freeze very often, i switched to lxde where is does not seem to
> > happen
> 
> Not even for OpenGL apps? Is the GNOME3 fallback mode affected now?

Hm it might happen for OpenGL apps - any hint here what app i can try to
provoke it? Some hints for me?
Gnome3 fallback mode i'll did not try - but i will test it too (with msi=1 and
msi=0).
All test cycles will take some time - guess i get a result in the next few
days.

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