On 2020-07-03 14:43 +0200, Jaroslav Kysela wrote:
> Dne 03. 07. 20 v 12:59 Mark Pearson napsal(a):
> >
> > > -----Original Message-----
> > > From: Alsa-devel <alsa-devel-bounces@xxxxxxxxxxxxxxxx> On Behalf Of
> > > Jaroslav Kysela
> > > Sent: Friday, July 3, 2020 6:34 AM
> > >
> > > Dne 03. 07. 20 v 10:00 Benjamin Poirier napsal(a):
> > > > As a result of commit d2cd795c4ece ("ALSA: hda - fixup for the bass
> > > > speaker on Lenovo Carbon X1 7th gen"), the sound output level on my machine, an
> > > > X1 Carbon 7th gen, was reduced to ~65% of its previous level when playing
> > > > certain sounds. [1]
> > > >
> > <snip>
> > >
> > > Thank you for this work. Perhaps, Takashi will have some comments to
> > > improve this quirk.
> > Seconded - thank you!
> >
> > <snip>
> > >
> > > > It is possible that the X1 Carbon 8th gen would benefit from the same
> > > > changes but I don't have a device to test that. Fixups are reordered so
> > > > that the devices for 7th & 8th gen can share the same chain after the first
> > > > fixup. The resulting chain is:
> > >
> > > 8th gen hardware should be similar, so the new fixup should be applied to this
> > > hw, too.
> > >
> > We'll do some testing here and confirm the fixes on the X1C7 and X1C8 (and Yoga)
> >
> > Do let me know if there is any details Lenovo can provide that would help
>
> The functionality of this patch is same like the hda-verb command is
> executed with the current kernel (run as root):
>
> hda-verb /dev/snd/hwC0D0 0x17 SET_CONNECT_SEL 1
>
> You can control tweeters with 'Speaker' volume control.
> And headphones and bass speakers with the 'Headphone' volume control.
For other X1 users who might stumble upon this discussion; practical
usage of the hda-verb trick requires a way to apply it automatically[1]
and changes to the ucm profile[2].
[1] https://gist.github.com/hamidzr/dd81e429dc86f4327ded7a2030e7d7d9#gistcomment-3345062
[2] https://gist.github.com/hamidzr/dd81e429dc86f4327ded7a2030e7d7d9#gistcomment-3335517
I've added more information here:
https://github.com/gobenji/thinkpad-x1-gen7-sound/tree/c5ebc9166e955934dab03d6c4fb5928cf28496b0#alternative-2---runtime-reconfiguration
