Bug#905015: xserver-xorg-input-elographics: Xorg hangs on start when touchscreen does not answer

[Frank Heckenbach <f.heckenbach@fh-soft.de>]

> 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 ...