@ralf3u What resolution are you using on each computer? xrandr --current should give the resolution and how the monitor is connected.

What GPU and driver are you using on each computer? Use lspci -v, and look for "VGA compatible controller". The kernel module should also be listed there.

Since window managers do compositing, the mesa driver could be relevant: glxinfo | grep -i opengl. Also, see if the bug occurs if you run LIBGL_ALWAYS_SOFTWARE=true geany.


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