usb camera only works once until reset
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Undecided
|
Unassigned |
Bug Description
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.
Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https:/ /wiki.ubuntu. com/Bugs/ FindRightPackag e. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.
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