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

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Date:	Fri, 20 May 2016 15:27:22 -0700
From:	Laura Abbott <labbott@...hat.com>
To:	Takashi Iwai <tiwai@...e.de>
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 03/15/2016 12:49 PM, Takashi Iwai wrote:
> On Tue, 15 Mar 2016 20:38:41 +0100,
> Takashi Iwai wrote:
>>
>> 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
>
> Oops, a typo: the last argument must be 0x00, corresponding to D0:
>     hda-verb /dev/snd/hwC0D0 0x05 SET_POWER 0x00
>
>

Bringing this back again, the command that makes it work is

hda-verb /dev/snd/hwC0D0 0x10 SET_POWER 0x00

And this is still needed as of 4.5.4

> Takashi
>

Thanks,
Laura