Sorting out input devices 3.

Okay, so the cursor jumped again after the last changes.
I changed the /usr/lib/X11/xorg.conf.d/10-wacom.conf like this:

Section "InputClass"
Identifier "Wacom serial class"
MatchProduct "Serial Wacom Tablet"
MatchDevicePath "/dev/ttyS0"
Driver "wacom"
# Option "Device""/dev/ttyS0"
Option "Type" "stylus"
Option "ForceDevice" "ISDV4"
Option "Button2" "3"
# Option "Button3" "4"
Option "TPCButton" "on"
EndSection

Section "InputClass"
Identifier "Wacom serial class"
MatchProduct "Serial Wacom Tablet eraser"
MatchDevicePath "/dev/ttyS0"
Driver "wacom"
# Option "Device""/dev/ttyS0"
Option "Type" "eraser"
Option "ForceDevice" "ISDV4"
Option "TPCButton" "on"
EndSection

and now the system doesn't recognize the eraser. (this wasn't intended)
However, the jumping never happened ever since, and that was already about a week ago.