[LightDM] Lightdm touch screen bug in multiple monitor

[洪伟松]

Hi, guys receiving the letter:
     I have install deepin 15.11 using lightdm as the display manger. However, there is bug that annoying me for many days.
     I have two monitors, and one of which support touching. In login interface, the position of screen is not correct. For example, My finger is on the position (x20,y20), cursor is actually on the position(x40, y20) as the following picture shows.
    In desktop environment, I can fix this bug using the following commands:xrandr --output VGA-1 --same-as LVDS-1orxinput map-to-output "eGalax Inc. eGalaxTouch P80H60 -0783-01.00.00.00" LVDS-1
What I have trying to do:1. put the above commands to rc.local(also enable the rc-local service)2. put the above commands to lightdm.conf(greeter-setup-script or display-setup-script ) in /etc/lightdm, reporting the return result 0 in log file.

However, all of them doesn't work!!!!!!!!! 
What I miss with this strange situation????????
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