I noticed this on Debian (buster). It appears to be caused by the
keyboard being detected multiple times, resulting in xfsettingsd running
xmodmap multiple times. To monitor, run:
XFSETTINGSD_DEBUG=1 xfsettingsd --replace --no-daemon
After suspend/resume (or just unplug/plug the USB keyboard), xfsettingsd
launches xmodmap multiple times:
xfce4-settings(keyboard-layout): spawning "xmodmap /home/user/.Xmodmap"
xfce4-settings(keyboard-layout): New keyboard detected; restoring XKB settings.
Warning: Only changing the first 3 of 10 buttons.
xfce4-settings(keyboard-layout): spawning "xmodmap /home/user/.Xmodmap"
xfce4-settings(keyboard-layout): New keyboard detected; restoring XKB settings.
Warning: Only changing the first 3 of 10 buttons.
xfce4-settings(keyboard-layout): spawning "xmodmap /home/user/.Xmodmap"
Warning: Only changing the first 3 of 10 buttons.
xfce4-settings(keyboard-layout): New keyboard detected; restoring XKB settings.
xfce4-settings(keyboard-layout): spawning "xmodmap /home/user/.Xmodmap"
xfce4-settings(keyboard-layout): New keyboard detected; restoring XKB settings.
xfce4-settings(keyboard-layout): spawning "xmodmap /home/user/.Xmodmap"
xfce4-settings(keyboard-layout): New keyboard detected; restoring XKB settings.
As a test, doing:
for x in {1..10}; do bash -c 'xmodmap ~/.Xmodmap &'; done
Has similar results of high CPU in xorg and xmodmap.
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https://bugs.launchpad.net/bugs/998310
Title:
.Xmodmap file makes xorg temporarily reach high cpu usage (90%-100%)
after resume or when coming back from tty to X session
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