Cam Link 4K disconnects, kernel warning, OBS video input frozen

[Benjamin Drung]

We have two cameras connected to Cam Link 4K and using OBS for live-streaming. Suddenly during the live-stream the video input went to black. The kernel message shows that the USB disconnect at 2332.127976s (but we did not unplug anything). Some seconds later the kernel shows warnings (2440.834346).

Since I did not want to stop the live stream, I unplugged the affected Cam Link 4K and plugged it back in, but this did not help. The video input that was in use when the incident happened kept frozen.

At the end, I closed OBS, but a zombie process remained:

$ ps auxff | grep ob[s]
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
tontech+ 28535 0.0 0.0 0 0 ? Z 11:30 0:00 | \_ [obs-cli]

This is the third time happening.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: linux-image-5.13.0-39-generic 5.13.0-39.44
ProcVersionSignature: Ubuntu 5.13.0-39.44-generic 5.13.19
Uname: Linux 5.13.0-39-generic x86_64
ApportVersion: 2.20.11-0ubuntu71.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: tontechnik 2101 F.... pulseaudio
 /dev/snd/controlC0: tontechnik 2101 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: MATE
Date: Sun Jun 5 11:39:21 2022
InstallationDate: Installed on 2020-08-14 (659 days ago)
InstallationMedia: Ubuntu-MATE 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
IwConfig:
 lo no wireless extensions.

 enp4s0 no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. B550M AORUS PRO
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.13.0-39-generic root=UUID=182c25dd-5701-40ff-8ac5-e0a623a2204f ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.13.0-39-generic N/A
 linux-backports-modules-5.13.0-39-generic N/A
 linux-firmware 1.201.5
RfKill:

SourcePackage: linux
UpgradeStatus: Upgraded to impish on 2021-11-14 (202 days ago)
dmi.bios.date: 03/25/2021
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: F13g
dmi.board.asset.tag: Default string
dmi.board.name: B550M AORUS PRO
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrF13g:bd03/25/2021:br5.17:svnGigabyteTechnologyCo.,Ltd.:pnB550MAORUSPRO:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnB550MAORUSPRO:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:
dmi.product.family: B550 MB
dmi.product.name: B550M AORUS PRO
dmi.product.sku: Default string
dmi.product.version: Default string
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.