[coreboot] T400 screen issue / EDID handling

[Francis Rowe]

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On 03/07/15 15:27, 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!
> 
> 
> 

Dear coreboot community,

tty0_ in #coreboot/#libreboot found a partial fix.

See:
http://libreboot.org/docs/hcl/gm45_lcd.html

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