> This was a bug in X server 1.19 fixed in 1.19.4 with > https://gitlab.freedesktop.org/xorg/xserver/-/commit/d8f63717e05ae8d820ceae74216916ebd180441d > > Unfortunately this bug is in the X server in stretch and won't get fixed > there now that stretch is LTS, but the versions in buster and later > should be fine.
I guess that explains why I got reports of touchscreens not working reliably in buster: I had applied the above patch to xserver-xorg-input-elographics, after duly checking it hadn't been applied yet. But of course, I had no way of knowing that the problem was fixed another way in another package. The result now was apparently an overcorrection, resulting in timeouts being too short and sometimes timing out ...