Bug#834595: mate-desktop: cursor doesn't follow finger on the touchscreen if second display is attached

[Oliver Sander]

control: reassign -1 xserver-xorg-input-all

I have a ThinkPad Yoga 12, which has a touchscreen.  In a normal session, I can
move my finger on the touchscreen, and the cursor will follow the finger.  Just like
it is supposed to.

However, I now plug in an external display.  By default, it is supposed to be physically
located to the right of my primary display, i.e., my desktop is now twice as wide;
the left part is on my built-in display, the right part on the external one.
In this situation, the code that computes the cursor position from my finger position
on the touchscreen is wrong: when I move my finger from the left edge to to the right
edge of my primal display, the cursor moves from the left boundary to the right boundary
of the entire virtual desktop.  In particular, if I touch the screen in the right half,
the cursor appears on the other display.

As it turns out, this is not a Mate issue:  I see the same effect with a KF5 Plasma desktop.




+++-============================-=============-============-=========================================================
un  xserver-xorg-input           <keine>       <keine>      (keine Beschreibung vorhanden)
un  xserver-xorg-input-2         <keine>       <keine>      (keine Beschreibung vorhanden)
un  xserver-xorg-input-2.1       <keine>       <keine>      (keine Beschreibung vorhanden)
un  xserver-xorg-input-4         <keine>       <keine>      (keine Beschreibung vorhanden)
un  xserver-xorg-input-7         <keine>       <keine>      (keine Beschreibung vorhanden)
ii  xserver-xorg-input-all       1:7.7+16      amd64        X.Org X server -- input driver metapackage
ii  xserver-xorg-input-evdev     1:2.10.2-1    amd64        X.Org X server -- evdev input driver
un  xserver-xorg-input-evtouch   <keine>       <keine>      (keine Beschreibung vorhanden)
un  xserver-xorg-input-joystick  <keine>       <keine>      (keine Beschreibung vorhanden)
ii  xserver-xorg-input-libinput  0.19.0-1      amd64        X.Org X server -- libinput input driver
ii  xserver-xorg-input-mouse     1:1.9.1-1+b1  amd64        X.Org X server -- mouse input driver
ii  xserver-xorg-input-synaptics 1.8.3-2       amd64        Synaptics TouchPad driver for X.Org server
un  xserver-xorg-input-tslib     <keine>       <keine>      (keine Beschreibung vorhanden)
ii  xserver-xorg-input-vmmouse   1:13.1.0-1+b1 amd64        X.Org X server -- VMMouse input driver to use with VMWare
ii  xserver-xorg-input-wacom     0.30.0-1+b1   amd64        X.Org X server -- Wacom input driver


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