[alsa-devel] [PATCH] ALSA: hda - Fix Dock Headphone on Thinkpad X250 seen as a Line Out

[Takashi Iwai]

At Wed, 24 Jun 2015 10:46:33 +0200,
David Henningsson wrote:
> 
> Thinkpad X250, when attached to a dock, has two headphone outs but
> no line out. Make sure we don't try to turn this into one headphone
> and one line out (since that disables the headphone amp on the dock).
> 
> Alsa-info at http://www.alsa-project.org/db/?f=36f8764e1d782397928feec715d0ef90dfddd4c1
> 
> Cc: stable at vger.kernel.org
> Signed-off-by: David Henningsson <david.henningsson at canonical.com>

This is one of fixes I had in mind (and asked for testing in bugzilla
kernel.org report).  One drawback by this is that the auto-mute
*between* the headphones won't work like before.  If one has expected
it, then this can be seen as a regression.

Another fix was to change this as a proper line-out.  This will keep
the current auto-mute behavior.

OTOH, dealing both jacks equally is also not bad, per se.


Takashi

> ---
>  sound/pci/hda/patch_realtek.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
> index 431a20b..8e02cdf 100644
> --- a/sound/pci/hda/patch_realtek.c
> +++ b/sound/pci/hda/patch_realtek.c
> @@ -4511,6 +4511,7 @@ enum {
>  	ALC255_FIXUP_HEADSET_MODE_NO_HP_MIC,
>  	ALC293_FIXUP_DELL1_MIC_NO_PRESENCE,
>  	ALC292_FIXUP_TPT440_DOCK,
> +	ALC292_FIXUP_TPT440_DOCK2,
>  	ALC283_FIXUP_BXBT2807_MIC,
>  	ALC255_FIXUP_DELL_WMI_MIC_MUTE_LED,
>  	ALC282_FIXUP_ASPIRE_V5_PINS,
> @@ -4960,6 +4961,12 @@ static const struct hda_fixup alc269_fixups[] = {
>  		.chain_id = ALC269_FIXUP_HEADSET_MODE
>  	},
>  	[ALC292_FIXUP_TPT440_DOCK] = {
> +		.type = HDA_FIXUP_FUNC,
> +		.v.func = alc269_fixup_pincfg_no_hp_to_lineout,
> +		.chained = true,
> +		.chain_id = ALC292_FIXUP_TPT440_DOCK2
> +	},
> +	[ALC292_FIXUP_TPT440_DOCK2] = {
>  		.type = HDA_FIXUP_PINS,
>  		.v.pins = (const struct hda_pintbl[]) {
>  			{ 0x16, 0x21211010 }, /* dock headphone */
> -- 
> 1.9.1
>