Hey hey, I'm running on a 5.4.24-rt15-1-rt #1 SMP PREEMPT_RT kernel and since I've been back - after a day - and rebooted my machine, Ican't change ttys anymore. I checked the keyboard with showkey, both alt and the f-keys come through. No job is overtaxing the CPU. It's almost down to 0-2% CPU usage. The keyboard is connected via USB, I had PS/2 keyboard issues a long time ago so switched. The HUB is working, other devices - including my braille display - work flawlessly. I'm currently typing this mail on my system. I know, this probably isn't strictly a matter for this list, but it is a good pool of knowledgeable and helpful people. So, can anyone suggest probable causes, methods to hunt the bug? TIA and best wishes, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * SoundCloud: https://soundcloud.com/jeanette_c * Twitter: https://twitter.com/jeanette_c_s * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c Cinderella's got to go <3 (Britney Spears)