Thanks Nico for your response.
> am expecting some register should set with eDP as interface and when
> display is connected
>
> any clue why the i915 OS driver was turning off DP display in case 2?
I assume the HPD signal doesn't get through to the software.
[Rao]
You mean I need to check PORT_HOTPLUG_EN and PORT_HOTPLUG_STAT mmio offsets for this issue?
BIOS display is fine, Windows logo is also seen but there is no signal when "windows login" is reached
It had similar behaviour w.r.t to ubuntu 18.04, I configured DDI1 to "DP with HDMI/DVI"
Can this issue be fixed with VBE data configured through BMP or it needs a fix from graphics MMIO?
Regards
Rao