https://bugs.freedesktop.org/show_bug.cgi?id=93911

Bug ID: 93911 Summary: Radeon rv635 with KMS and no dpm, intermittent/random GPU lockup Product: Mesa Version: 11.0 Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: Drivers/Gallium/r600 Assignee: dri-devel@lists.freedesktop.org Reporter: dabreese00@gmail.com QA Contact: dri-devel@lists.freedesktop.org

I am running Slackware Linux on my laptop with ATI/AMD Mobility Radeon HD 3670. I have a recurring crash/lockup that happens intermittently while running X: my screen will spontaneously freeze for a few seconds, then the screen goes blank black or white, or slowly change colors, for a few seconds, during which it's still frozen (mouse/keyboard input has no effect, even CTRL-ALT-F1 or CTRL-ALT-BACKSPACE). Afterwards it returns me to a distorted/garbled version of my desktop, and I can switch to a virtual terminal and kill X or reboot. Sometimes instead -- rarely -- the system recovers successfully and I am returned to a fully functional X desktop after the lockup. I have saved dmesg from both versions of the crash.

I haven't figured out a way to trigger it. The only common thread I've noticed is it seems to only happen when the system is under some kind of load, and is updating the display. But it happens fairly regularly, something like once a week.

I have tried adjusting some X radeon settings (man radeon), and some kernel radeon settings (modinfo radeon). After I added dpm=0 to radeon module parameters, the crash behavior became more simple and consistent (now it's almost always a slow fade to white followed by a glitched desktop screen) and showed closer to a full recovery. Nothing I've tried has stopped the lockup from occurring entirely, except disabling kernel modesetting (which leaves me with poor resolution options).

root@Dell-XPS:~# uname -a Linux Dell-XPS 4.1.15 #2 SMP Tue Dec 15 21:00:31 CST 2015 x86_64 Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz GenuineIntel GNU/Linux