I have a Dell wd19TB thunderbolt dock and it seems to work fine with ElementaryOS until I try to disable the Laptop display and only use my external displays. I am trying to disable the laptop display however it wont disable. I tried this same functionality on Ubuntu and it worked with no issues. I also made sure the "bolt" application was installed in ElementaryOS. My laptop is a Lenovo yoga 720. Any help would be very appreciated.
Type in terminal command:
to shows the exact names of displays
This one shows VGA (15-pin blue connector), HDMI, Display Port and LVDS (laptop screen):
xrandr -q | grep 'VGA\|HDMI\|DP\|LVDS'
This is a sample command to turn off LVDS-1 and enable VGA-1:
xrandr --output LVDS-1 --off --output VGA-1 --auto
To switch back:
xrandr --output VGA-1 --off --output LVDS-1 --auto
You must combine and replace VGA-1 with the output name for your external screen. I hope I explained it enough clear.