Hello. I’m running Manjaro with KDE Plasma on a System76 Oryx Pro 6. A little while after the last update in stable, I updated the Nvidia driver from video-hybrid-intel-nvidia-440xx-prime to 450xx. I did this in the Hardware Configuration GUI and I needed to do this because my installation of OBS studio needed the updated driver.
After I did this, Plasma Shell appeared to crash. I was able to move into tty but when I tried to restart Plasma I got the following error:
qt.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin “xcb” in “” even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
I’ve already tried to reinstall libxcb at the recommendation of another thread, but that didn’t work. I"ve also moved to testing for the off chance that updating the kernels and headers would help, but it doesn’t. This behavior also occurs in linux5.4, 5.7, and 5.8. EDIT: I should add that this only happens when optimus is switched to Nvidia.
Ah, thanks. This thread wasn’t up when I last checked, but this does seem to be the problem. Unfortunately I need the 450xx drivers for now so my only option might be to just not let my machine sleep until the bugs are worked out.