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

[Kailang]

> -----Original Message-----
> From: Takashi Iwai <tiwai@xxxxxxx>
> Sent: Tuesday, February 11, 2020 5:20 PM
> To: Kailang <kailang@xxxxxxxxxxx>
> Cc: Benjamin Poirier <benjamin.poirier@xxxxxxxxx>; Jaroslav Kysela
> <perex@xxxxxxxx>; alsa-devel@xxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH 2/2] ALSA: hda/realtek - Fix Lenovo Thinkpad X1 Carbon
> 7th quirk value
> 
> On Tue, 11 Feb 2020 10:10:50 +0100,
> Kailang wrote:
> >
> > Hi,
> >
> > Speaker 2 connect to DAC 0x2 was Lenovo requested.
> > This was tune for EQ setting.
> > I didn't know more for this.
> 
> Thanks, that was my expectation, too.  Applying EQ to built-in speakers is an
> oft-seen workaround for laptops to avoid the possible hardware damage.
> 
> Now the question is whether this obvious level of lowering is the expected
> result.
> 
> Kailang, could you try to ask Lenovo about it?
> 
Yes, this is expected. I confirm this with our Lenovo AE.

> 
> Takashi
> 
> >
> > BR,
> > Kailang
> >
> > > -----Original Message-----
> > > From: Benjamin Poirier <benjamin.poirier@xxxxxxxxx>
> > > Sent: Tuesday, February 11, 2020 4:16 PM
> > > To: Jaroslav Kysela <perex@xxxxxxxx>
> > > Cc: Takashi Iwai <tiwai@xxxxxxx>; Kailang <kailang@xxxxxxxxxxx>;
> > > alsa-devel@xxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> > > 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.
> > >
> > > ------Please consider the environment before printing this e-mail.
> >