From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Henningsson <david.henningsson@canonical.com>
Subject: Re: HD-audio runtime PM
Date: Mon, 25 Nov 2013 10:20:55 +0100
Message-ID: <52931677.4070609@canonical.com>
References: <s5hli0gmyxt.wl%tiwai@suse.de>	<5292EF19.1040900@canonical.com>
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To: Takashi Iwai <tiwai@suse.de>
Cc: "Lin, Mengdong" <mengdong.lin@intel.com>, alsa-devel@alsa-project.org
List-Id: alsa-devel@alsa-project.org

On 11/25/2013 08:17 AM, Takashi Iwai wrote:
> At Mon, 25 Nov 2013 07:32:57 +0100,
> David Henningsson wrote:
>>
>> On 11/22/2013 12:57 PM, Takashi Iwai wrote:
>>> Hi,
>>>
>>> after my previous fix, the runtime PM seems working stably finally.
>>> However, there seem still some glitches:
>>>
>>> 1. The wakeup via jack or HDMI/DP detection doesn't seem to work on my
>>>   test machines.  WAKEEN is set properly.  And its value can be read
>>>   correctly at the point of runtime resume, too.
>>
>> Hi and thanks for working on this.
>>
>> I've been trying to reproduce the above, but I can't seem to activate
>> runtime PM at all. I can't seem to get a callback to runtime_suspend,
>> and further investigation shows that
>> /sys/class/sound/card0/power/runtime_status shows "unsupported".
> 
> You need to adjust power/control of the parent PCM device,
> i.e. /sys/devices/pci/*/power/control.  The following udev rule should
> work for HD-audio.  Give it a try.
> 
>   ACTION=="add", SUBSYSTEM=="pci", ATTR{class}=="0x040300", TEST=="power/control", ATTR{power/control}="auto"

I tried this rule, but it did not make any difference -
/sys/class/sound/card0/device/power/control was still on. (And I did
proofread the rule...)

I tried "echo auto > /sys/class/sound/card0/device/power/control" -
after that, I had the following:

/sys/class/sound/card0/device/power/control - auto
/sys/class/sound/card0/device/power/runtime_status - active
/sys/class/sound/card0/power/control - auto
/sys/class/sound/card0/power/runtime_status - unsupported

...so it did not seem to help.

-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic