lxqt-config-mon taking all X connections

11 January 2022, 17:56:24

Greetings. Just installed Artix weekly (Jan 10) yesterday, with runit and LXQt. Been seeing this problem:

$ falkon
Maximum number of clients reachedqt.qpa.xcb: could not connect to display :0
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
Fatal: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.

Aborted

I see a lot of lxqt-config-mon processes in the list that "ps" gives. I can work around the problem by "killall lxqt-config-mon".

What's really bad is that apps just silently fail. Start teh file manager or Falkon with the GUI, using the icons in the lower left corner, and nothing happens. The user doesn't know if their mouse button isn't working, or whether they misclicked, or what. Had to start the app in a terminal to see the above error message.

Re: lxqt-config-mon taking all X connections

Reply #1 – 12 January 2022, 12:56:52

Quote from: bzipitidoo – on 11 January 2022, 17:56:24

Maximum number of clients reached

Something is forking/crashing uncontrollably and you're running out of file descriptors. It probably is lxqt-config-monitor. You can strace(1) it to see where it crashes, it may give you some clues. As root, run "chmod -x /usr/bin/lxqt-config-monitor" from a console to prevent it from clogging Xorg, until you fix it. I think the cause is some customization you made in settings and you hit a bug. Also see this thread.