When searching for a solution I found that someone had a similar problem when reconnecting their keyboard. I have seen the lights on the keyboard blink at times, so I tried unplugging and reconnecting the keyboard and yes - that reset the layout. I can see keyboard removed/detected entries in the logs as well, so I guess my keyboard reconnects sometimes, I don't know why. However the solution from the post earlier (to rename the xmodmap file to ~/.Xmodmap) did not help. So is there another default filename I should use? Or do I have to enable xmodmap to run when a keyboard is plugged in somehow?
The only thing I can think of right now is to monitor /var/log/Xorg.0.log for "Adding input device USB Keyboard" and running xmodmap when that happens... but I'm really hoping for a better solution. Any ideas?
update: If I can't fix the xmodmap problem, maybe I can fix the usb disconnects.
I read something about power saving settings for usb. After some digging, I found that those settings are in /sys/bus/usb/devices/.../power/. However, disabling autosuspend for the hub did not seem to help (it was already disabled for the keyboard).
But I found something else in kern.log. Perhaps the keyboard disconnects has something to do with static electricity?
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[ 7078.175830] usb 1-10-port3: disabled by hub (EMI?), re-enabling...
[ 7078.175888] usb 1-10.3: USB disconnect, device number 4
[ 7078.624349] usb 1-10.3: new full-speed USB device number 6 using xhci_hcd
[ 7078.729012] usb 1-10.3: New USB device found, idVendor=04d9, idProduct=0125
[ 7078.729014] usb 1-10.3: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 7078.729016] usb 1-10.3: Product: USB Keyboard