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

[Kolmar Kafran]

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

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:

  apport-collect 1825679

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Sebastien Bacher (seb128)]

Could you also add a 'journalctl -b 0' log after getting the issue?

[Launchpad Janitor (janitor)]

[Expired for gnome-shell (Ubuntu) because there has been no activity for 60 days.]

[Rafael Ferro (rafaelferro)]

I also had this problem and the suggested workaround helped solving it. Actually, it additionally solved a delay issue on login screen when recovering from suspension and a delay on xdotool commands. Is it possible to reopen this bug report or should I open a new one?

[Kolmar Kafran (kafran)]

Rafael,

Can you please do as Sebastien suggested?
I can't help as I don't have this machine anymore.

[Rafael Ferro (rafaelferro)]

'apport-collect 1825679' won't work because I'm not the author or because the report is closed. I'm attaching the journalctl output.

[Daniel van Vugt (vanvugt)]

Rafael,

This bug is closed so the most helpful thing to do would be to open a new bug. Just run:

  ubuntu-bug gnome-shell