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

[Jaroslav Kysela]

Dne 11. 02. 20 v 9:16 Benjamin Poirier napsal(a):
> 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

Yes, you're right. I forgot that.

> > 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:

Yes, but does the volume control work (does PA change the appropriate ALSA 
mixer volume)? Sometimes, it's difficult to see the difference between soft 
volume attenuation and the hardware volume control.

> > > 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.

Just install the latest pulseaudio (latest from repo), alsa-lib and 
alsa-ucm-conf (also from repo). If pulseaudio detects UCM, it has the preference.

						Jaroslav

>


--
Jaroslav Kysela <perex@xxxxxxxx>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.