On Fri, 2007-05-25 at 11:27 +0530, Nobin Mathew wrote:
I am implementing power management in my ALSA sound drivers. ALSA drivers are not working properly after resume. All registers values are proper and I am able to read back the codec register contents.
Iirc, you are using an AC97 codec. This means that the AC97 link is running as expected after resume.
If I do a playback after resume then I am getting lots of "underrun".
Do you hear any audio at all ? The underruns are probably being caused by the AC97 Tx FIFO not being filled quickly enough by DMA. Is your DMA being set up correctly after resume ?
After a reboot playback is working fine.
Is there any known issues with ALSA power management?
ALSA suspend and resume works fine on lots of devices (all the ones I have). I suspect you have a driver problem.
Liam