I tested on the latest mainline kernel and still have the same issue:
jlquinn@cerberus:~$ v4l2-ctl --device /dev/video0 --stream-mmap
--stream-to=frame.raw --stream-count=1
VIDIOC_STREAMON returned -1 (Protocol error)
jlquinn@cerberus:~$ uname -a
Linux cerberus 6.15.0-061500rc7-generic #202505182143 SMP PREEMPT_DYNAMIC Sun
May 18 22:13:39 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
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https://bugs.launchpad.net/bugs/2110582
Title:
Protocol error when capturing from UVC webcam
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