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

--- Comment #38 from Joaquín Aramendía samsagax@gmail.com --- (In reply to Rafael J. Wysocki from comment #36)

It looks like on your system the device having the "switching _DSM" method has to be marked with no_hotplug.

Indeed, the Nvidia card has a sound card in it that is claimed by the snd_hda_intel module. That module controls both sound cards.

I'll apply patch in comment #37 and report back.