Comment # 14
on bug 99881
from Matthew Fox
Hi, It's rare that the PC doesn't lock up with runpm enabled so I've only been able to test this a couple of times. In the first try, the PC had stabilized (stopped freezing) after a while. I then ran xrandr. Immediately after I cat /sys/kernel/debug/vgaswitcheroo/switch and the discrete gpu had powered up. dmesg showed 1 block of gpu initialization lines. A few seconds later vgaswitcheroo/switch showed the discrete gpu as being off. dmesg also showed 2 or 3 blocks of the gpu initialization. It looked like the gpu was being enabled and disabled repeatedly. The computer then locked up a few seconds later. I don't have any logs for this session. In the second try, the PC had stabilized. I ran xrandr and vgaswitcheroo/switch had changed from 'DynOff' to 'DynPwr' for the discrete gpu. dmesg showed 1 block of the gpu initialization. The computer locked up a few seconds later. The logs I have were captured straight after xrandr had run so the 'dmesg after' log only shows one of the gpu initialization blocks but I suspect the gpu was being enabled and disabled repeatedly before the PC locked up. I wasn't able to run dmesg again before the lockup to confirm.
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