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Secondary screen ( HDMI <-> DSI )
Hi all, 

Today I was try to adding secondary screen (hdmi) and couldnt figure out why hdmi was visible in terminal but not on "Preferences>Monitor Settings". However I figured out and in case if you going to use secondary screen on TB use following steps;

# list all the available output resolution
$ xrandr

most probably you will have DSI-1 as primary and HDMI-1 is disconnected. 

# activate hdmi over dsi
$ xrandr --output HDMI-1 --auto --right-of DSI-1 (make sure the device name is the same as listed in "xrandr" command)

# Change resolution of HDMI
$ xrandr --output HDMI-1 --mode 1920x1080

After this commands, the same settings will be visible on "Preferences>Monitor Settings" 

Some other useful commands can be helpful on wiki but they havent mentioned for secondary screen.

Hope this helps  Rolleyes

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