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

bugzilla-daemon
2014-04-14T17:25:53Z

--- Comment #7 from Alex Deucher <alexdeucher@gmail.com> ---
(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?