Delay/freeze/cpu spike when using the function/media/brightness keys in Xorg

Bug #1825679 reported by Kolmar Kafran on 2019-04-20
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
xkeyboard-config (Ubuntu)
Undecided
Unassigned

Bug Description

There is a long time bug when the user press any function key or media key om Gnome, the CPU spikes to 100%, the system freezes for some seconds and then the key is pressed. This is particularly true when change the screen brightness. This only happens in Xorg, Wayland is not affected.

On Brazilian keyboard a workaround is to edit the file `/usr/share/X11/xkb/symbols/br` and comment the line `modifier_map Mod3 { Scroll_Lock };`

This has been affecting multiple users and has been discussed on

https://www.reddit.com/r/gnome/comments/84453o/delayfreezecpu_spike_when_using_the_functionmedia/

https://askubuntu.com/questions/1025302/media-keys-delayed-and-cause-a-cpu-spike-to-100-on-ubuntu-17-10-with-gnome

https://askubuntu.com/questions/906723/fn-media-keys-slow-delayed-on-ubuntu-gnome-17-04?noredirect=1&lq=1

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