Hi
> -----Original Message-----
> From: Alsa-devel <alsa-devel-bounces@xxxxxxxxxxxxxxxx> 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)
