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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1888297
Title:
usb camera only works once until reset
Status in linux package in Ubuntu:
Incomplete
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.
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