[alsa-devel] power save of snd_hda_intel
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?
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
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
On Wed, 2008-05-28 at 18:57 +0530, Harsha priya gupta wrote:
- 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.
participants (3)
-
Harsha priya gupta -
Takashi Iwai -
Tony Vroon