I have the same basic problem. Same USB device ID was working "not long
ago", but now fails. One (perhaps very significant) difference. My
system is Ubuntu 18.04, and the kernel seems to be a 4.15 variant. uname
-a gives:
Linux OptiPlex-9020 4.15.0-118-generic #119-Ubuntu SMP Tue Sep 8
12:30:01
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-signed-hwe-5.4 (Ubuntu)
Status: New => Confirmed
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** Tags added: kernel-fixed-upstream
** Tags removed: kernel-bug
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https://bugs.launchpad.net/bugs/1894424
Title:
CONFIG_EFI_CUSTOM_SSDT_OVERLAYS causes HDMI video capture device to
Mainline kernel fails in the same way. Upstream latest works but is
unusable for a number of reasons.
Summary:
5.4.0-42 - OK
5.4.0-45 - Fails
5.4.0-47 - Fails
5.4.55 (CONFIG_EFI_CUSTOM_SSDT_OVERLAYS=n) - OK
5.9-rc5 - OK
As the upstream kernel works, this suggests there may be a bug in the
