[alsa-devel] HDA Power management.
Ok, I've been studying the code for a couple of weeks now, and testing on a mobile type development platform with a Realtek ALC262, but I have not been able to get the audio codec to enter low power mode (D3). I can see it switch when running that other OS. When running, the chip draws ~400mw, but drops to 40mw after switching to low power mode. How do I get it to do the same with the current driver? I'm using the git tip for alsa, and 2.6.26 final kernel.
I have tried setting the power mode to D3 using the hda-tool from Takashi, but the codec reverts to D0 (full power) after a second or two, even though there is nothing touching the audio in my test environment.
At Tue, 05 Aug 2008 15:13:36 -0700, Tobin Davis wrote:
Ok, I've been studying the code for a couple of weeks now, and testing on a mobile type development platform with a Realtek ALC262, but I have not been able to get the audio codec to enter low power mode (D3). I can see it switch when running that other OS. When running, the chip draws ~400mw, but drops to 40mw after switching to low power mode. How do I get it to do the same with the current driver? I'm using the git tip for alsa, and 2.6.26 final kernel.
I have tried setting the power mode to D3 using the hda-tool from Takashi, but the codec reverts to D0 (full power) after a second or two, even though there is nothing touching the audio in my test environment.
Could you show alsa-info output? I guess some loopback switches are turned on that prevent the power-down.
Takashi
participants (2)
-
Takashi Iwai -
Tobin Davis