Hi
-----Original Message----- From: Alsa-devel alsa-devel-bounces@alsa-project.org On Behalf Of Takashi Iwai Sent: Tuesday, May 26, 2020 2:24 AM
We fixed the regression of the speaker volume for some Thinkpad models (e.g. T570) by the commit 54947cd64c1b ("ALSA: hda/realtek - Fix speaker output regression on Thinkpad T570"). Essentially it fixes the DAC / pin pairing by a static table. It was confirmed and merged to stable kernel later.
Now, interestingly, we got another regression report for the very same model (T570) about the similar problem, and the commit above was the culprit. That is, by some reason, there are devices that prefer the DAC1, and another device DAC2!
Unfortunately those have the same ID and we have no idea what can differentiate, in this patch, a new fixup model "tpt470-dock-fix" is provided, so that users with such a machine can apply it manually. When model=tpt470-dock-fix option is passed to snd-hda-intel module, it avoids the fixed DAC pairing and the DAC1 is assigned to the speaker like the earlier versions.
That's interesting - let me follow up with the HW team and see if I can find out why this is. It would be nice to have something that works for all cases automatically.
Mark (Lenovo)