[Bug 73901] Kernel crash after modprobe radeon runpm=1

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https://bugzilla.kernel.org/show_bug.cgi?id=73901

--- Comment #7 from Alex Deucher <alexdeucher@xxxxxxxxx> ---
(In reply to Pali Rohár from comment #5)
> So I cannot turn off dGPU when it is not used?
> 

Correct.  The driver requires that method to power on/off the dGPU.

> Also I think that kernel should not crash when booting with (maybe
> incorrect?) param runpm.

Yes, that should probably be fixed.

(In reply to Pali Rohár from comment #6)
> Btw, I looked into DSDT/SSDT acpi tables and there is ATPX method (in SSDT7,
> scope \_SB.PCI0.GFX0).

Did you enable vgaswitcheroo support in your kernel config?

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