Screen issues when connected to HDMI to a second monitor

Hi,

Since my upgrade to Ubuntu 24.04 on my Framework 13inch Intel 12th gen, there is a small issue with the internal screen. When I connect a second monitor via HDMI, there is a strange behavior:

  • if I’m doing something on the external monitor, the internal screen sometimes starts to flicker or freeze. Usually, if I switch my activity back to something happening on the internal screen, only then the flickering stops.
  • This issue does not appear when mirroring the laptop screen, only with “Join” display.
  • Issue dissapears when unconnecting the external monitor
  • There was no issue with that monitor prior to upgrading from Ubuntu 22.04 LTS

I’m not tech-savvy enough to meddle with X or Wayland, but I suspect the issue is not hw-related. I’ve tried with two different monitors and the issue persists.

Can anyone help ? Happy to provide more info if necessary.