Comment 3 for bug 456769

I see this also on my HP EliteBook 8530w laptop. In my case the changing color of the LED has helped me diagnose another issue.. my sound card seems to be sleeping at irregular times and waking up randomly. Sadly the times it wakes up does not seem even slightly related to when I'm trying to play sounds. I'll be filing a new bug about that soon.

Anyway, the reporter and I seem to be using the same (or very similar) audio controller:

Codec: Analog Devices AD1984A
Address: 0
Function Id: 0x1
Vendor Id: 0x11d4194a
Subsystem Id: 0x103c30e7
Revision Id: 0x100400

I think this is an issue in how the driver handles our particular card. I've attached my complete info from the alsa project's alsa-info.sh script.