I'm having the same problem with both Ubuntu 18.04 and 20.04. Commenting
the line
modifier_map Mod3 { Scroll_Lock };
does help but it does not solve it. My system does not freeze anymore
but CPU usage still goes unusually up.
In addition, setting the brightness with the mouse by clicking and
dragging on the top bar makes the brightness icon lag and causes the
same odd CPU behavior.
It also only happens on xorg.
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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xkeyboard-config in Ubuntu.
https://bugs.launchpad.net/bugs/1895486
Title:
[media-keys] Fn media keys with lag slow/delay on Gnome with "Scroll
Lock" keyboards
To manage notifications about this bug go to:
https://bugs.launchpad.net/gnome-shell/+bug/1895486/+subscriptions
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