[Bug 74551] Unable to run linux with radeon.runpm=1

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=74551

--- Comment #16 from maxis11 <ya.maxis11@yandex.ru> ---
(In reply to Alex Deucher from comment #15)
> (In reply to maxis11 from comment #13)
> > (In reply to Alex Deucher from comment #12)
> > > (In reply to maxis11 from comment #6)
> > > > BTW runpm works with 3.12.7 and 3.12.8 (with 3.13 and later runpm=1 freezes
> > > > laptop during boot)
> > > 
> > > runpm support didn't exist until 3.13. If "echo OFF >
> > > /sys/kernel/debug/vgaswitcheroo/switch" has never worked, then your system
> > > has never had functional support for turning on/off the dGPU.
> > 
> > kernel 3.12.7:
> > When loading SUMO2(6480g)
> 
> That's not runpm, that's dpm (dynamic power management).  Runpm turns the
> dGPU off completely when it's not in use.  Dpm dynamically adjusts the
> clocks and voltages of the GPU when it's powered on.  Prior to 3.13, runpm
> was not available and the dGPU was always powered on unless you manually
> powered it off via debugfs.

So it seems that this is Acer BIOS problem freezes laptop, when trying to turn
off dGPU. Am I right?

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