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

[Kailang]

Hi,

Speaker 2 connect to DAC 0x2 was Lenovo requested.
This was tune for EQ setting.
I didn't know more for this.

BR,
Kailang

> -----Original Message-----
> From: Benjamin Poirier <benjamin.poirier at gmail.com>
> Sent: Tuesday, February 11, 2020 4:16 PM
> To: Jaroslav Kysela <perex at perex.cz>
> Cc: Takashi Iwai <tiwai at suse.de>; Kailang <kailang at realtek.com>;
> alsa-devel at alsa-project.org; linux-kernel at vger.kernel.org
> Subject: Re: [PATCH 2/2] ALSA: hda/realtek - Fix Lenovo Thinkpad X1 Carbon
> 7th quirk value
> 
> 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.
> 
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