[pulseaudio-tickets] [Bug 67644] New: PulseAudio deals suboptimally with kernel issue with logitech usb webcam

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67644

          Priority: medium
            Bug ID: 67644
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: PulseAudio deals suboptimally with kernel issue with
                    logitech usb webcam
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: rocketraman at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: core
           Product: PulseAudio

The Linux kernel, for some time, has been having random problems with Logitech
webcams. I have encountered this problem in Fedora, but there is a large
community of Ubuntu users who have this problem also.

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/884210

The basic issue seems to be that the kernel somehow messes up the webcam, and
the webcam has to be unplugged and replugged in order to continue.

However, while PulseAudio is not the "root cause" of the issue, it appears to
handle the problem in a sub-optimal way:

1) Once the webcam is "broken", all PulseAudio sound becomes broken, even to
devices that are still working perfectly well.

2) Once the webcam is unplugged and replugged, PulseAudio needs to be
restarted. It does not automatically recover from whatever situation it has
gotten into.

I will attach a trace from pulseaudio -vvvvv the next time this happens on my
system.

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