Question / Help OBS preview window black since Ubuntu 20.04 upgrade

mattgodbolt

New Member
Hi folks,

I've used OBS a bunch of times before but having just upgraded to 20.04 I now get a black preview screen (the main canvas view). If I get options on each source I see the capture is working but the overall composite view is empty. If I resize the UI I can see that the view isn't repainting properly: I see bits of the previous UI still in the area that should be full of preview. If I bring up the "windowed projector" window I see the composite view.

Logs: https://obsproject.com/logs/sMAZ62VC0FRPXFds

Additionally my newer webcam (new since OS upgrade; not tried with prior version) doesn't work: I get a flickering black and white image (I also see the webcam light flashing on and off super quickly). The webcam works in other video apps.

I apt purge'd, re-added the PPA and reinstalled; no difference.

Happy to try anything to help diagnose: please let me know if I can do anything else.

Thanks!

--matt
 

mattgodbolt

New Member
I've found that maximisng and unmaximising the window "helps" (I get to see a little bit at least): maximising it on my second monitor reliably "breaks" it again, but if I move the window over to my "main" monitor, adjust the size of the window (a tiny bit), then things start working. Any size adjustments while the window is on the second monitor break things again. I attach the logs from the most recent session here: https://obsproject.com/logs/P5wJloG7zTv35HI8
 

aral

New Member
Seeing the exact same thing with Pop!_OS 20.04. (Only manifests on my laptop’s screen; my external monitor is fine.)
 

aral

New Member
OK, so this is curious. It appears that the issue is more precisely this:

On 20.04, it only works without screen corruption on the monitor that starts at origin (for me, I have two monitors, side-by-side. The monitor I set as the one on the left in GNOME settings is fine. On the other OBS is corrupted. It isn’t related to which monitor is set as primary/secondary. If put the external monitor on the left, OBS’s preview displays fine on it. If I set the laptop’s monitor as on the left, OBS runs fine on it. On whichever monitor is set as the right one, the preview doesn’t display and the interface appears corrupted.

Related: https://obsproject.com/forum/thread...-kubuntu-20-04-with-multiple-monitors.121834/
 
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