Change in ...coreboot[master]: lenovo/x230: introduce FHD variant

[Nico Huber (Code Review)]

Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/28950 )

Change subject: lenovo/x230: introduce FHD variant
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Patch Set 6:
> Aha, I recall now. What is the issue with the current setup? Does it fail to see something is attached on the DP port, or do eDP ports need some additional config to enable the backlight?

It's a historical issue. Originally, libgfxinit (on Ironlake) only
knew LVDS as connector for integrated panels. It was just called
`Internal`. When I added eDP support, I kept the notion of `Inter-
nal` and added a config flag if it's LVDS or the dedicated eDP
port. I didn't know back then, that Intel allows to use other
DP ports in combination with the panel logic, too. But they do.

So, what libgfxinit needs is explicit port types LVDS and eDP
(instead of the `Internal`). And a config to tell what port (can
be any) is used for an integrated panel.

Without the panel logic, timing isn't adhered and maybe there is
a backlight issue, too.