So, seems I have figured out the issue (at least on my Lenovo T460s) and
I think it lies with the Intel chip internal GPU.
If you use display port and HDMI-->Display Port adapter it won't work.
The Intel chip doesn't seem to support two DP connections at a time. But
you can connect Dp &
Same here. Lenovo T460s (Intel only). Cannot use HDMI to Display Port.
HDMI to VGA works though on the same port!! The below is with HDMI->VGA.
With HDMI->DP it just doesn't recognise the display.
Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 8192 x 8192
eDP-1 connected primary
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