linux-kernel - Regression: Kernel 4.6 DisplayPort Audio

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Date:	Wed, 11 May 2016 10:32:07 +0200
From:	Daniel Exner <dex@...gonslave.de>
To:	"Subhransu S. Prusty" <subhransu.s.prusty@...el.com>
Cc:	Daniel Exner <dex@...gonslave.de>,
	Vinod Koul <vinod.koul@...el.com>,
	Takashi Iwai <tiwai@...e.de>, linux-kernel@...r.kernel.org
Subject: Regression: Kernel 4.6 DisplayPort Audio

Hi,

(Please keep me CC as I am currently not subscribed to LKML or any other
Linux Kernel Dev ML, thanks)

Since very first 4.6 rc1 the speakers integrated in my monitor (Dell
U3415W) stopped working. It is connected via DisplayPort from a ATI R7 270X.

Same setup works just fine in 4.5.3.

The bug report about this is:

https://bugzilla.kernel.org/show_bug.cgi?id=114981

I managed to bisect this down to:

commit 739ffee97ed550a2899a925ed3f260fa1e8fa955
Author: Subhransu S. Prusty <subhransu.s.prusty@...el.com>
Date:   Fri Mar 4 19:59:49 2016 +0530

    ALSA: hda - Add hdmi chmap verb programming ops to chmap object

But I cannot easily revert this from current rc7.
Please make me a happy DP Audio User again :)

I can provide further informations or test possible patches.

Greetings
Daniel
-- 
Daniel Exner
Public-Key: https://www.dragonslave.de/pub_key.asc

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