$ dpkg -l|grep v4l2loop
ii v4l2loopback-dkms 0.12.3-1ubuntu0.1
all Source for the v4l2loopback driver (DKMS)
ii v4l2loopback-utils 0.12.3-1ubuntu0.1
all Commandline utilities for the for the v4l2-loopback module
$ dkms status|grep v4l2
v4l2loopback, 0.12.3, 5.4.0-51-generic, x86_64: installed
v4l2loopback, 0.12.3, 5.4.0-52-generic, x86_64: installed
$ modprobe v4l2loopback exclusive_caps=1
$ dmesg|grep v4l2-ioctl
<nothing>
I already was using the updated code, so I repeated the steps in a VM
with the current version of the driver and got the following in dmesg:
[ 471.604470] WARNING: CPU: 1 PID: 18911 at
drivers/media/v4l2-core/v4l2-ioctl.c:1064 v4l_querycap+0x8b/0xa0 [videodev]
[ 471.604602] WARNING: CPU: 1 PID: 18911 at
drivers/media/v4l2-core/v4l2-ioctl.c:1069 v4l_querycap+0x8f/0xa0 [videodev]
** Tags removed: verification-needed verification-needed-focal
** Tags added: verification-done verification-done-focal
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https://bugs.launchpad.net/bugs/1899633
Title:
Repeated kernel warnings/stacktraces with kernel 5.4 and newer
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/v4l2loopback/+bug/1899633/+subscriptions
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