Public bug reported: I have a usb camera (SDI camera, attached to magewell usb capture) which only works once. It displays the image in something like OBS Studio or ffplay, and works perfectly. I can stop the capture. Then trying to open the camera a second time does not work, I get a black screen in ffplay/OBS.
To fix this, I can unplug the device and plug it back in, at which point it works until stopped and restarted. So basically, I always have to unplug it and plug it back in after stopping otherwise it won't display an image a second time. Debian 10 works perfectly fine using same physical hardware and video software, but using (x)ubuntu 20.04 I get the problem as noted above. So I suspect a kernel bug/regression. I'm using an AMD 16 core system but don't know if it's related to that. It makes no difference whether I use the USB ports on the motherboard (USB 3.1), or whether I use an addon USB 3.1 PCI card. (And debian doesn't care either which usb port I use, it works correctly there across the board). I have no idea how to report more information. I've done the software updates etc., so whatever kernel is running in 20.04 as of this date, that's what I'm using now. ** Affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1888297 Title: usb camera only works once until reset To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1888297/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs