[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 #39 from Joaquín Aramendía <samsagax@xxxxxxxxx> ---
Created attachment 120391
  --> https://bugzilla.kernel.org/attachment.cgi?id=120391&action=edit
dmesg after patch from comment #38

Now when I get to the tty the system is at leas responsive. The card is turned
off and doing

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

I noticed an order change (before 1 was the DIS card, 2 the DIS-Audio).

Then I started to toy with it, tryed

# systemctl isolate graphical.target

And it hanged. So I rebooted and tried again. This time trying a reboot after
checking the vgaswitcheroo status, and it hanged with the attached dmesg. I'm
not able to get into a graphical.target yet.

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