[Bug 99881] Lockup/Freezes on Laptop with switchable graphics

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99881

--- Comment #14 from Matthew Fox <matthew at tech3.me> ---
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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