Do I get this right that this permanently disables pm_runtime on all Intel HDaudio controllers?
It just drops the unconditional enablement of runtime PM. It can be enabled via sysfs, and that's the old default (let admin enabling it via udev or whatever).
Sorry I am confused now. Kai seemed to suggest in the Bugzilla comments that this would be temporary, until these problems with i915 and ALC662 get fixed?
Right, that's the plan. This patch revert to the old state before the forced-all-enable call we've taken in 5.7. On 5.7 and onwards, all HD-audio controllers are enforced to use the runtime PM. Before that version, the runtime PM was enabled *as default* only for limited devices (typically the ones bound with GPU); for other devices, the runtime PM is manually enabled from user-space via sysfs (and many distros enable them in anyway).
The forced enablement was merged with a hope that now all HD-audio controllers behave nicely, but it turned out to cause a regression, so it was reverted. Once when we find out the real cause, we can flip the flag again.
ok, sounds good. I was concerned mainly because on the SOF driver side we enable pm_runtime by default, so that's a difference in configuration we need to be aware of when dealing with 'my speaker is silent' support questions.