[coreboot] Re: Question On External Display

[Nico Huber]

Hi,

On 30.07.21 16:47, Rao G wrote:
> The problem originally I had was that on PortC, DP/HDMI did not work for
> the external display in the OS, In BIOS it looked good,
> so I configured PortC as an eDP interface then the external display started
> working in the OS.

this sounds much like you are still facing the same problem. When you
configure the port as eDP, Linux' i915 will simply skip reading the
exact register we are looking (and just assume the display is present).

Have you tried to measure the hotplug signal when your display is
connected/disconnected? Maybe something is physically wrong with the
board design, cable, or display?

Nico