[coreboot] T400 screen issue / EDID handling

[ron minnich]

Gee, what fun. There are lots of things that can go wrong, to get some
idea, see the
display handling for HP Falco, in which we managed 4 different types of
displays.

I'll try to take a look later, but just keep in mind that the displays are
frequently not all the same
on different production runs of a laptop so something that works fine on
one gives black
screen on another ...

ron

On Fri, Jul 3, 2015 at 7:35 AM <kroms at posteo.be> wrote:

> Hello,
>
> I allready contacted Francis from libreboot and he forwared me to this
> list, because it seems to be an issue regarding coreboot.
>
> I have flashed a Lenovo T400 with libreboot.
>
> The T400 has an Intel GPU and I am able to use it with an external
> display connected to the onboard vga-port.
>
> The issue is, that I can't use the internal display, which is an
> 1440x900 Samusung LTN141WD-L05, EDID dump:
>
> https://paste.debian.net/plainh/b3699c60
>
> It seems like the internal screen is powered on while booting but it
> stays black.
>
> Francis assumes that this is due to bugs in how coreboot handles the
> EDID.
>
> Here is an EDID dump of a working display:
>
> http://paste.debian.net/plainh/776705d5
>
> Anyone is able to help?
>
> Thanks in advance!
>
>
>
> --
> coreboot mailing list: coreboot at coreboot.org
> http://www.coreboot.org/mailman/listinfo/coreboot
>
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