X freezes randomly due to radeon

Michel Dänzer michel at daenzer.net
Thu May 23 08:25:56 PDT 2013

On Don, 2013-05-23 at 16:03 +0200, x_puma_x wrote:
> Hi All,
> I recently did a fresh install of archlinux with KDE on my notebook and since 
> then I get seemingly random freezes (varying lenght) of the X server.
> During the freezes everything on the screen stops moving but music keeps 
> playing and I am still able to ssh onto the machine.
> With the help of some guys over at freenode I think I was able to find out that 
> the freezes are caused by the radeon driver.
> So when I run htop via ssh during one of the freezes I see that /usr/bin/X has 
> the state "D for disk sleep (uninterruptible)".
> There is nothing getting logged to either dmesg or /var/log/Xorg.0.log .
> But I took a snapshot of /proc/$(pidof X)/stack and attached them.
> During normal work it looks like stack_good.txt and during freezes it always 
> looks like stack_during_freeze.txt
> Any ideas?

Hmm, sounds like it sometimes takes a long time for the kernel radeon
driver to notice that the GPU has signalled a fence. Please attach your
dmesg output.

Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer

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