1355773 - Audio device still fails to work after unplug/re-plug when the computer has no onboard audio device

Status: NEW

(Core :: Audio/Video: MediaStreamGraph, defect, P3)

Description

[Paul Silaghi, QA [:pauly]]

[Note]:
- see bug 1340718#c27

[Affected versions]:
- 52 - 55

[Affected platforms]:
- Win 10, Ubuntu 14.04, OS X 10.11

[Steps to reproduce]:
1. Open https://mozilla.github.io/webrtc-landing/gum_test.html
2. Click 'audio' -> note that I'm able to hear myself (echo) in the headphones
3. Unplug the USB headset
4. Re-plug the USB headset

[Expected result]:
- Still able to hear echo

[Actual result]:
- No longer able to hear echo

[Regression range]:
- tbd

[Additional notes]:
- I used a Microsoft LifeChat LX-3000 USB headset

Comment 1

[Paul Adenot (:padenot)]

I can't repro using all the USB headsets I have at the office. When un-plugging the device, the audio is captured using the built-in mic of the machine, and on plugging back, the audio is captured using the USB headset again.

Can you try with a different headset, to try to understand if this particular headset is doing something weird ?

Comment 2

[Paul Silaghi, QA [:pauly]]

I've just reproduced the issue with another Cabstone multimedia headset.
55.0a1 (2017-04-13) (32-bit), Win 10 x64.
Note that I'm using a desktop computer, and there is no built-in microphone available.

Comment 3

[Paul Adenot (:padenot)]

(In reply to Paul Silaghi, QA [:pauly] from comment #2)
> Note that I'm using a desktop computer, and there is no built-in microphone
> available.

This is what I was missing. I'll have a look on a similar setup next week.

Comment 4

[Randell Jesup [:jesup] (needinfo me)]

This is not a primary usecase - lowering priority.  It's even unclear if this should by the spec work at all, since there's a period there where there is no working input.  (perhaps it may switch to the unused analog input on the motherboard, though the system might know there's nothing attached there, and then plugging a new headset in may not override that)

Comment 5

[Bulk Bug Changes for mreavy's org]

Mass change P2->P3 to align with new Mozilla triage process.