linux-kernel - Re: [REGRESSION] Headphones no longer working on MacPro6,1 with 4.4

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Date:	Tue, 15 Mar 2016 20:38:41 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	"Laura Abbott" <labbott@...hat.com>
Cc:	"Jaroslav Kysela" <perex@...ex.cz>, <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org >> Linux Kernel Mailing List" 
	<linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] Headphones no longer working on MacPro6,1 with 4.4

On Tue, 15 Mar 2016 20:23:09 +0100,
Laura Abbott wrote:
> 
> Hi,
> 
> We received a bug report https://bugzilla.redhat.com/show_bug.cgi?id=1316119
> that the headphone jack on a MacPro6,1 stopped working on an upgrade from 4.3
> to 4.4.
> 
> The bugzilla has the alsainfo, diffing shows that the Amp-Out vals are
> different. I tried a revert of 9f660a1c4 (" ALSA: hda/realtek - Fix silent
> headphone output on MacPro 4,1 (v2)") but that didn't help.
> 
> Any ideas before asking for a bisect? Does this hardware version need to have
> the vref fixup as well?

The obvious difference is the power state of each node.  The recent
kernel has the finer power saving mode, and this might be the cause --
Mac has some secret that requires some node to be powered up.

Try to power on each node via hda-verb.  For example, to power up the
node 0x05, run like:
  hda-verb /dev/snd/hwC0D0 0x05 SET_POWER 0x01

And check whether it makes any difference.
Similarly, try for nodes 0x06, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
0x0f, 0x10, 0x11, 0x14, 0x15, 0x16, 0x17, 0x18.


thanks,

Takashi