Blank external monitor

I am using Intel HD Graphics 4400, have the system configured as per https://wiki.freebsd.org/Graphics. On boot with no monitor connected the following error repeats:
Code:
drmn0: [drm] *ERROR* uncleared fifo underrun on pipe B
drmn0: [drm] *ERROR* CPU pipe B FIFO underrun
When I connect my monitor via display port I get:
Code:
[drm] Unable to create a private tmpfs mount, hugepage support will be disabled(-19).
[drm] Got stolen memory base 0xbb200000, size 0x4000000
[drm] Initialized i915 1.6.0 20200917 for drmn0 on minor 0
drmn0: [drm] *ERROR* uncleared fifo underrun on pipe B
drmn0: [drm] *ERROR* CPU pipe B FIFO underrun
[drm] Unable to create a private tmpfs mount, hugepage support will be disabled(-19).
[drm] Got stolen memory base 0xbb200000, size 0x4000000
[drm] Initialized i915 1.6.0 20200917 for drmn0 on minor 0
drmn0: [drm] *ERROR* uncleared fifo underrun on pipe B
drmn0: [drm] *ERROR* CPU pipe B FIFO underrun
drmn0: [drm] *ERROR* failed to enable link training
[drm] Unable to create a private tmpfs mount, hugepage support will be disabled(-19).
[drm] Got stolen memory base 0xbb200000, size 0x4000000
[drm] Initialized i915 1.6.0 20200917 for drmn0 on minor 0
[drm] Unable to create a private tmpfs mount, hugepage support will be disabled(-19).
[drm] Got stolen memory base 0xbb200000, size 0x4000000
[drm] Initialized i915 1.6.0 20200917 for drmn0 on minor 0
The DP-1 is set as connected in xrandr and the monitor displays a blank image as if also connected.
When booting with the monitor connected there is an image for a of couple seconds.

VGA via a HP docker connector adapter doesnt work either.
 
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