power save of snd_hda_intel

power save of snd_hda_intel

[Harsha priya gupta]

Hi,

I am trying to get a power_save option of snd_hda_intel working.
We are using latest ALSA build and ALC262 codec. when we start the player
and close it, we dont see any power savings. [ We see the power saving in
windows with the same ALC262 card]

Any idea what i could be doing wrong here?

-- 
-Harsha

Re: power save of snd_hda_intel

[Takashi Iwai]

At Wed, 28 May 2008 18:39:42 +0530,
Harsha priya gupta wrote:
> 
> Hi,
> 
> I am trying to get a power_save option of snd_hda_intel working.
> We are using latest ALSA build and ALC262 codec. when we start the player
> and close it, we dont see any power savings. [ We see the power saving in
> windows with the same ALC262 card]
> 
> Any idea what i could be doing wrong here?

How did you try it exactly?


Takashi

Re: power save of snd_hda_intel

[Harsha priya gupta]

This is what we tried;
1. Connected the system with ALC262 card to DAQ to get power measurements
2. With Linux HDD, we installed the snd_intel_hda module.
3. From ALSA .15 version, if am not wrong, power_save is enabled by default.
4. We open a media player and play the song. The power is high. After the
song stops we close the player and see that the power is still high and
power does not drop down.
5. With windows HDD, on playing a song we see the power is high. After the
music stops and player is closed, the power falls down

On Wed, May 28, 2008 at 6:49 PM, Takashi Iwai <tiwai@suse.de> wrote:

> At Wed, 28 May 2008 18:39:42 +0530,
> Harsha priya gupta wrote:
> >
> > Hi,
> >
> > I am trying to get a power_save option of snd_hda_intel working.
> > We are using latest ALSA build and ALC262 codec. when we start the player
> > and close it, we dont see any power savings. [ We see the power saving in
> > windows with the same ALC262 card]
> >
> > Any idea what i could be doing wrong here?
>
> How did you try it exactly?
>
>
> Takashi
>



-- 
-Harsha

Re: power save of snd_hda_intel

[Tony Vroon]

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On Wed, 2008-05-28 at 18:57 +0530, Harsha priya gupta wrote:
> 3. From ALSA .15 version, if am not wrong, power_save is enabled by default.

The functionality is enabled, but the default timeout is 0 seconds
(never power down). You may have to specify a timeout. 10 seconds works
well for me, but you can try something more aggressive like 3 seconds if
you want to see quick response on your measurements.
Generally you can hear the power up as an audible pop as you start
playback.

Regards,
Tony V.

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Re: power save of snd_hda_intel

[Harsha priya gupta]

I checked on these articles...i manually set it the value to 10 but still
dont see any power saving...

has anyone tried this before and seen any power saving?

please help me with more clues...

On Wed, May 28, 2008 at 9:44 PM, Chris Pemberton <
cjpembo.mailing.lists@gmail.com> wrote:

> Harsha priya gupta wrote:
>
>> Hi,
>>
>> I am trying to get a power_save option of snd_hda_intel working.
>> We are using latest ALSA build and ALC262 codec. when we start the player
>> and close it, we dont see any power savings. [ We see the power saving in
>> windows with the same ALC262 card]
>>
>> Any idea what i could be doing wrong here?
>>
>>
>>
> powertop is your friend
>
> www.lesswatts.org
>
> specifically:
>
> http://www.lesswatts.org/tips/misc.php
>
> Chris
>



-- 
-Harsha