usb camera only works once until reset

Bug #1888297 reported by Localdev JS
6
This bug affects 1 person
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.

Revision history for this message
Ubuntu Foundations Team Bug Bot (crichton) wrote :

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/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1888297/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

tags: added: bot-comment
Revision history for this message
Localdev JS (localdevjs) wrote :

bump; any thoughts?

Revision history for this message
Paul White (paulw2u) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better.

As per comment #1, this bug did not have a package associated with it, which is important for ensuring that it gets looked at by the proper developers. You can learn more about finding the right package at https://wiki.ubuntu.com/Bugs/FindRightPackage.I have classified this bug as a bug in 'linux' as there may be an issue detecting your hardware by the kernel that you are currently using as you suspected.

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://help.ubuntu.com/community/ReportingBugs.

Please provide any additional information when prompted to do so by the kernel bot.

affects: ubuntu → linux (Ubuntu)
tags: added: focal
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote : Missing required logs.

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1888297

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
Revision history for this message
sixfold fable (sixfoldfable) wrote :

- I have a Magewell USB Capture HDMI+

- I can replicate this problem in Windows (but let me double check)

- The microphone works fine

- I have the following setup:

Microphone --XLR--> Camera[bmpc6k] --hdmi--> Video Interface[Magewell USB Capture HDMI+] --usb3--> Computer

Revision history for this message
sixfold fable (sixfoldfable) wrote :

- I can replicate this problem in Windows (but let me double check)

Nope, that was a lie.

Revision history for this message
sixfold fable (sixfoldfable) wrote :
Revision history for this message
Launchpad Janitor (janitor) wrote :

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

Changed in linux (Ubuntu):
status: Incomplete → Expired
To post a comment you must log in.
This report contains Public information  
Everyone can see this information.

Other bug subscribers

Remote bug watches

Bug watches keep track of this bug in other bug trackers.