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I am running Ubuntu with XFCE.

After I plug in a USB device (mouse, keyboard, headset) the system becomes unresponsive for 5-20 seconds (windows do not focus, resizing windows does not redraw content of windows of some programs (Thunderbird, Firefox, terminal xfce4-terminal does redraw), mouse works, keyboard works) which was not happening before and is quite anoying. It also happens after waking up the system from sleep, there I have unresponsive system too.

I see that these two processes have high CPU usage:

  1. /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
  2. xfwm4 --replace

If I plug in only mouse it takes 3-5 seconds. If I plug in mouse and keyboard both via usb hub it takes 10-15 seconds.

/var/log/Xorg.0.log does not show anything weird - just information about plugged in devices, also the dmesg does show only information about the devices. journalctl -f either ( https://pastebin.com/eFr2XYgE ).

Where to look for the problem further?

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  • Check dmesg and journalctl -f outputs as well. Commented Aug 19, 2020 at 11:50
  • Output from dmesg or journalctl does not show anything weird. Sometimes I see there error "rtw_pci 0000:03:00.0: failed to send h2c command". Commented Aug 19, 2020 at 14:03
  • Do you have a ~/.Xmodmap? See unix.stackexchange.com/questions/546116/… Commented Jan 10, 2022 at 21:16

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