[pulseaudio-discuss] PulseAudio losing USB headset over suspend / resume

[Thilo-Alexander Ginkel]

Hello everyone,

I have a Jabra Pro 9465 DECT headset attached to my laptop via USB.
This used to work like a charm with my old laptop (a ThinkPad T420s
running PulseAudio 1.1 and 4.0).

Recently, I switched to a T440p and am having problems with the
headset's microphone disappearing from PulseAudio over a
suspend/resume cycle ever since. The microphone source is still
visible in ALSA after the resume (e.g., through alsamixer).

I found out the following factors, which contribute to the problem occurring:
- SMP: When I limit the CPU to one core and one thread the problem disappears
- USB 3.0: When I force the USB ports to USB 2.0 the problem disappears

The problem occurs with PA 4.0 and 5.0 running on Kubuntu 14.04
(x86_64, kernel 3.17-rc1).

Any ideas how to continue debugging this?

I captured the `pulseaudio -vvvvv` output for both scenarios (using PA 5.0):
- Failure (source lost):
https://secure.tgbyte.de/dropbox/YtuIpmg4k0Ha3P25-failure.log
- Sucess (source survived S3):
https://secure.tgbyte.de/dropbox/YtuIpmg4k0Ha3P25-success.log

Thanks,
Thilo