Comment # 21
on bug 65963
from paul.woegerer@gmail.com
(In reply to comment #20) > (In reply to comment #19) > > @Damian, I had the same problems. My configuration is similar to yours: > > Radeon 7870, Linux 3.16.1, xorg 1.16, MESA 10.3 RC1 (fedora f21 branch). > > > > After consulting https://wiki.archlinux.org/index.php/ATI it tried adding > > radeon.dpm=0 to my kernel command line as a workaround. It solved the > > problem. No more lockups. The system is now stable with the above > > configuration. Clearly this has something to do with the powermanagement > > changes in MESA and the kernel (there were no lockups with earlier versions > > of MESA) > > There is no power management code in mesa. Power management is completely > self-contained in the kernel. If you are not getting lockups with dpm > enabled and an older version of mesa, it may be a mesa issue. Hmm, sounds like newer versions of MESA trigger a dormant power management issue in the radeon kernel driver (with certain Pitcairn hardware) ...just speculating. It's a while ago thus I can't tell the exact version of kernel and MESA when I first observed the behavior. All I can say for sure is that now since using radeon.dpm=0 I did not experience a single lockup anymore (which is good enough for me). Is there a way to build the radeon kernel driver with some additional debugging/logging that could help you to understand what's going on ?
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