[alsa-devel] [PATCH 2/2] ALSA: hda/realtek - Fix Lenovo Thinkpad X1 Carbon 7th quirk value

[Benjamin Poirier]

On 2020/02/11 08:40 +0100, Jaroslav Kysela wrote:
[...]
> > 
> > In summary, Node 0x17 DAC connection 0x3 offers the loudest max volume and
> > the most detailed mixer controls. That connection is obtained with quirk
> > ALC295_FIXUP_DISABLE_DAC3. Therefore, change the ThinkPad X1 Carbon 7th to
> > use ALC295_FIXUP_DISABLE_DAC3.
> 
> The volume split (individual volume control) will cause trouble for the UCM
> volume control at the moment which is the target for this device to get the
> digital microphone working. If there is no possibility to share DAC, it
> would be probably more nice to join the volume control in the driver.
> 
> Have you tried to use 0x03 as source for all four speakers?

Front speakers are fixed to 0x02. Node 0x14
  Connection: 1
     0x02

> 
> Why PA handles the rear volume control with the current driver code in the
> legacy ALSA driver? It should be handled like standard stereo device. I'll
> check.

The device comes up with "Analog Stereo Output" profile by default. I
changed it to "Analog Surround 4.0 Output" to test controlling each
channel individually:

> > pavucontrol controls are reported with the device configured with the
> > "Analog Surround 4.0 Output" profile.

> 
> You should also test PA with UCM.

Please let me know what do I need to test exactly? I'm not familiar with
UCM.