No picture when booting with dock after screen upgrade on x250

Hi.
I have upgraded my x250 screen to a 00HN899, and it works fine if I use the laptop without my dock and external screen. However if I have it in the dock when starting it works in the BIOS and GRUB, but as soon as Manjaro is supposed to display the login screen everything is just black. This happens even on a Live USB.

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To get everything to work I have to boot to Manjaro outside the dock, then connect it to the dock and my second monitor (3440x1440@60hz), after that sleep mode and everything works fine and both the internal screen and external monitor will turn on and off as they should until i completely turn off the laptop again, then I will have to redo this whole process.

B4 I upgraded from my TN panel I did not have this problem.

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Anyone knows of a solution? I have already tried changing the BIOS settings to 512mb gpu memory and tried to use the dock as the start display.

Edit: I fixed it by changing to display port from the dock instead of hdmi, maybe the high resolution of the external monitor on the older hdmi protocol together with my higher internal resolution messed something up at boot.