On Sun, Jul 11, 2021 at 02:15:46PM +0200, Tristan Miller wrote: > Greetings. > > On Sun, 11 Jul 2021 12:38:12 +0200, Greg KH > <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > On Sun, Jul 11, 2021 at 10:25:03AM +0200, Tristan Miller wrote: > > > Many models of Logitech USB webcams malfunction under Linux by > > > producing audio that sounds distorted, garbled, or high-pitched. > > > For most users, the problem happens randomly, and can usually be > > > worked around by restarting the audio application or by unplugging > > > the webcam and then plugging it back in again. > > > > Please report the information directly here, to this list, and to the > > sound developers at alsa-devel@xxxxxxxxxxxxxxxx and we can all work to > > resolve this. > > The problem as I'm currently experiencing it is as follows: > > I have a Logitech C270 USB webcam running on openSUSE Tumbleweed for > x86_64 with the 5.13.0 kernel. Sometimes audio recorded by the > camera's built-in microphone sounds artificially high-pitched and > garbled. I've experienced this with lots of different applications, > including arecord, Skype, and various browser-based videoconferencing > software running in Firefox or Chromium. The problem occurs rarely > (maybe once every 30 times I use the webcam microphone) and seemingly > at random; restarting the audio application or unplugging the webcam > and plugging it back in again usually works around the issue. So > unfortunately I can't reliably reproduce the problem. I haven't > noticed any errors in the system logs but then again am not sure exactly > what to look for and where. I've been experiencing this problem at > least as far back as kernel 4.13.12. > > Some further details (more available on request): > > # uname -a > Linux butterfield.nothingisreal.com 5.13.0-1-default #1 SMP Fri Jul 2 05:54:32 UTC 2021 (aa40472) x86_64 x86_64 x86_64 GNU/Linux > > # lsusb -s 001:004 -v |head -17 > Bus 001 Device 004: ID 046d:0825 Logitech, Inc. Webcam C270 > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 2.00 > bDeviceClass 239 Miscellaneous Device > bDeviceSubClass 2 > bDeviceProtocol 1 Interface Association > bMaxPacketSize0 64 > idVendor 0x046d Logitech, Inc. > idProduct 0x0825 Webcam C270 > bcdDevice 0.10 > iManufacturer 0 > iProduct 0 > iSerial 2 6457F4D0 > bNumConfigurations > > Previous reports which apparently cover the same problem: Some additional details about these bug reports: > https://bugzilla.kernel.org/show_bug.cgi?id=35922 This is a completely different bug, which was fixed back in 2011. > https://bugzilla.kernel.org/show_bug.cgi?id=44281 This report mentions three separate bugs, the first of which was fixed in 2012. The bug discussed here is the third one in the report. > https://bugzilla.kernel.org/show_bug.cgi?id=105081 This is a repeat of the second bug in #44281. > https://bugzilla.kernel.org/show_bug.cgi?id=203763 This is the same as the bug discussed here. > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/459445 This is the same as the second bug in #44281. > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/843431 At first glance this seems to be the same as the bug discussed here, but this one was fixed in 2011. > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/884210 This is the same as the second bug in #44281. > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1018020 This seems to be a combination of the first and second bugs in #44281. The rest of these appear to be mixtures of the bugs mentioned above. > https://bugzilla.suse.com/show_bug.cgi?id=736093 > https://bugzilla.redhat.com/show_bug.cgi?id=729269 > https://bugzilla.redhat.com/show_bug.cgi?id=742010 > https://bugs.archlinux.org/task/26528 > https://bbs.archlinux.org/viewtopic.php?id=121607 > https://bbs.archlinux.org/viewtopic.php?id=236056 > https://forums.linuxmint.com/viewtopic.php?t=237677 Alan Stern
