It might be useful to see the output from running 'xmodmap' just in case there's something odd with the key mapping Otherwise, it could also be possible that the scroll event somehow isn't making it to the canvas window, similar to bug 1909679
It might be useful to see the output from running 'xmodmap' just in case there's something odd with the key mapping
Otherwise, it could also be possible that the scroll event somehow isn't making it to the canvas window, similar to bug 1909679