Mirror dual monitors with different resolutions

[Max Chen]

Ubuntu 14.04 LTS, with Unity, XFCE (4.10) and Mate (1.82)

recently, I try mate 1.82 (https://launchpad.net/~ubuntu-mate-dev/+archive/ubuntu/trusty-mate), find it is cool.

The following cmd (ThinkPad X230T, VGA1 in classroom, DP1 in my office. When teaching I should mirror and/or scale the output when using the stylus)
xrandr --output DP1 --mode 1024x768 --scale 1.334x1 --same-as LVDS1 --output LVDS1 --mode 1366x768
works under Unity, XFCE with compiz, and Mate without compiz

However, if I enable compiz in Mate (mate tweak -> Windows -> windows manager -> Compiz), and run the former command, the monitors both will show something unexpected, and I can move the mouse, but no response for any click on any where.

temporary workaround
1 disable compiz in mate: mate tweak -> Windows -> windows manager -> Marco
2 connector the external monitor (VGA to a projector, or DP to a big screen)
3 mirror the monitors: xrandr --output DP1 --mode 1024x768 --scale 1.334x1 --same-as LVDS1 --output LVDS1 --mode 1366x768
4 enable compiz: mate tweak -> Windows -> windows manager -> Compiz

[Max Chen (maxchen)]

on Mate with compiz
xrandr --verbose --output DP1 --mode 1920x1200 --pos 1366x0 --output LVDS1 --mode 1366x768 --pos 0x0 --primary
works as expected, however, the following cmds
xrandr --output DP1 --off
xrandr --output DP1 --mode 1920x1200 --pos 0x0 --output LVDS1 --off
or if I discounted the external monitor
will cause the computer into trouble, can only be rescued by restart X (ctrl+alt+backspace)