[alsa-devel] [PATCH] ALSA: hda/realtek: Limit mic boost on T480

[Benjamin Berg]

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On Wed, 2018-02-14 at 14:00 +0100, Takashi Iwai wrote:
> On Wed, 14 Feb 2018 13:29:39 +0100,
> Benjamin Berg wrote:
> > 
> > The internal mic boost on the T480 is too high. Fix this by
> > applying the
> > ALC269_FIXUP_LIMIT_INT_MIC_BOOST fixup to the machine to limit the
> > gain.
> > 
> > Signed-off-by: Benjamin Berg <bberg at redhat.com>
> > Tested-by: Benjamin Berg <bberg at redhat.com>
> 
> Applying this quirk itself is OK, but just wonder whether this model
> has a docking station port.  Recently we fixed the dock issue, and it
> required to apply ALC298_FIXUP_TPT470_DOCK.

I assumed that on the T480 and similar models the audio on the dock is
connected through USB (the dock is USB-C + further pins), but I cannot
confirm this myself right now as I only have a T480 currently.

I have now contacted Peter Zhang of Lenovo about this and also to check
if other 80 series models may need the same fixup.

Benjamin

> 
> thanks,
> 
> Takashi
> 
> > ---
> >  sound/pci/hda/patch_realtek.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/sound/pci/hda/patch_realtek.c
> > b/sound/pci/hda/patch_realtek.c
> > index ce28f7ce64e6..8467ce3db767 100644
> > --- a/sound/pci/hda/patch_realtek.c
> > +++ b/sound/pci/hda/patch_realtek.c
> > @@ -6510,6 +6510,7 @@ static const struct snd_pci_quirk
> > alc269_fixup_tbl[] = {
> >  	SND_PCI_QUIRK(0x17aa, 0x224b, "Thinkpad",
> > ALC298_FIXUP_TPT470_DOCK),
> >  	SND_PCI_QUIRK(0x17aa, 0x224c, "Thinkpad",
> > ALC298_FIXUP_TPT470_DOCK),
> >  	SND_PCI_QUIRK(0x17aa, 0x224d, "Thinkpad",
> > ALC298_FIXUP_TPT470_DOCK),
> > +	SND_PCI_QUIRK(0x17aa, 0x225d, "Thinkpad T480",
> > ALC269_FIXUP_LIMIT_INT_MIC_BOOST),
> >  	SND_PCI_QUIRK(0x17aa, 0x30bb, "ThinkCentre AIO",
> > ALC233_FIXUP_LENOVO_LINE2_MIC_HOTKEY),
> >  	SND_PCI_QUIRK(0x17aa, 0x30e2, "ThinkCentre AIO",
> > ALC233_FIXUP_LENOVO_LINE2_MIC_HOTKEY),
> >  	SND_PCI_QUIRK(0x17aa, 0x310c, "ThinkCentre Station",
> > ALC294_FIXUP_LENOVO_MIC_LOCATION),
> > -- 
> > 2.14.3
> > 
> > 
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