I can confirm the same problem and the "Scroll Lock" workaround worked here too. I'm using my system with English language but the keyboard is the BR-ABNT2. I tried with different drivers of Nvidia and with Noveau, no difference. I'm using ubuntu 20.04.1 LTS.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs