[Bug 64891] [snd_hda_codec] BUG: soft lockup - CPU#0 stuck for 22s (when using vgaswitcheroo)

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https://bugzilla.kernel.org/show_bug.cgi?id=64891

--- Comment #22 from Joaquín Aramendía <samsagax@xxxxxxxxx> ---
Thanks for the reply, Alex.
Adding 'acpiphp.disable=1' to bootloader indeed helps.

Tested on
$ uname -r
3.12.6-1-ARCH

Last lines of dmesg shows the Nvidia card is shut down
[   25.473454] hda-intel 0000:01:00.1: Disabling via VGA-switcheroo
[   28.062014] ACPI Warning: \_SB_.PCI0.P0P1.PEGP._DSM: Argument #4 type
mismatch - Found [Integer], ACPI requires [Package] (20130725/nsarguments-95)

And is confirmed by vgaswitcheroo
# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0
2:DIS-Audio: :Off:0000:01:00.1

Then tested powering on/off with prime and it didn't work. It froze when
calling:
$ DRI_PRIME=1 glxinfo | grep renderer

Couldn't catch the dmesg after that.

Indeed it seems like a duplicate of bug 61891. I can't test the patch proposed
there as it's radeon specific.

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