Public bug reported:
Connecting a magnifying webcam (cheap microscope) fills the journal with
the message "Failed to query (GET_DEF) UVC control 2 on unit 1: -32
(exp. 1)". It also makes amdgpu driver to start to write Fence "fallback
timer expired on ring gfx" and on ring sdma0/sdma1. This corruption or
whatever happens produces microstuttering and video/audio framerate
loss, like it is reading the same audio buffer two times and then
catches up to the current stream position.
Because the device was not connected at the time of filing this bug, I
have attached an extra file with the output of "lsusb -d a16f:0304 -v".
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-generic-hwe-20.04 5.13.0.30.33~20.04.17
ProcVersionSignature: Ubuntu 5.13.0-30.33~20.04.1-generic 5.13.19
Uname: Linux 5.13.0-30-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Feb 24 22:09:07 2022
InstallationDate: Installed on 2014-06-05 (2820 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: linux-meta-hwe-5.13
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-meta-hwe-5.13 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal third-party-packages
** Attachment added: "lsusb-device-verbose.txt"
https://bugs.launchpad.net/bugs/1962223/+attachment/5563558/+files/lsusb-device-verbose.txt
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https://bugs.launchpad.net/bugs/1962223
Title:
uvcvideo Failed to query (GET_DEF) UVC control 2 on unit 1: -32 (exp.
1)
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