linux-kernel - Lenovo Dock + Thinkpad X260 -> no HDMI audio output

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Message-ID: <20161116023821.hcwg4u2iconuc5d6@burischnitzel.preining.info>
Date:   Wed, 16 Nov 2016 11:38:21 +0900
From:   Norbert Preining <preining@...ic.at>
To:     linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Lenovo Dock + Thinkpad X260 -> no HDMI audio output

Dear all,

(please cc)

I am trying to get HDMI audio output via a Lenovo Dock Ultra in
combination with a Lenovo Thinkpad X260.

When plugging the HDMI device (screen) directly into the laptop, 
audio output can be selected in pavucontrol / Configuration, but
when the laptop is connected via the dock all the HDMI devices
appear as unplugged.

I have googled a bit and found a similar case for T430:
http://permalink.gmane.org/gmane.linux.alsa.user/36896
and checking the source code of snd_hda_intel it seems that
	options snd-hda-intel model=lenovo-dock
should help, but indeed it didn't.

I am running Debian/sid, on today's git kernel (4.9.0-rc5+).

I attach the output of alsa-info.

Please let me know whether I can try some more tweaks. 

Thanks a lot

Norbert

--
PREINING Norbert + TeX Live & Debian Developer + http://www.preining.info
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