[alsa-devel] [ALSA] ALSA Power Management, Drivers behaving unexpectedly after suspend/resume cycle

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.

If I do a playback after resume then I am getting lots of "underrun".

After a reboot playback is working fine.

Is there any known issues with ALSA power management? Why Ubuntu and Redhat does ALSA modules removal before suspend and insertion after resume?