Comment 26 for bug 1615734

I have the same issue on Ubuntu 17.04 with Nvidia 375.66.
Using two 1920x1200 display connected to Thinkpad Docking Station 230W with Displayport.
Then I'm using the default monitor in Thinkpad P51, 1920x1080p.

In Ubuntu I have hard time getting all three displays to work, once they work I can't adjust any display settings (e.g. moving one monitor to the right side of another), without everything chrashing and I have to restart lightdm in terminal view.

However I'm capable of getting triple monitor setup correct in i3wm, and then using arandr as setup, but my laptop monitor (which is not set as primary), kinda works like an extension to my primary monitor, the workspaces works fine on all three monitors but when I'm opening e.g. rofi or dmenu on my laptop it stretches over all screens (dmenu doesn't even open), but when I go to one of the two connected monitors it works just fine.

If you need any files please tell.