[Nouveau] [Bug 99505] Attempting to reclock GeForce GT740M (GK208) cause GPU and system to hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99505

--- Comment #5 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Boyan Ding from comment #3)
> (In reply to Ilia Mirkin from comment #1)
> > I think you can't reclock while the GPU is disabled. Try running DRI_PRIME=1
> > glxgears while doing that echo.
> 
> I tried to reclock while running glxgears (the AC line shows 405 MHz instead
> of 0), but it also hangs.

Hmmm... this is probably a different issue then. To double-check, try booting
with nouveau.runpm=0 (which will disable all the runpm stuff).

Either way, please try to figure out where the echo gets stuck (you can echo
... something into sysrq-trigger, I forget what... 'w' maybe?)

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