[coreboot] T400 screen issue / EDID handling

[kroms at posteo.be]

Dear Paul, dear Ron,

thank you for your messages!

I used a pre-compiled libreboot ROM image for flashing my T400:

t400_8mb_ukqwerty_vesafb.rom

(source: http://mirrors.mit.edu/libreboot/20150518/rom/)

I attached most of the requested information, I hope I found the right 
information:

requested information -> attached file or remark

.config of coreboot -> config_t400_8mb_libreboot

and the payload -> the 4 files beginning with grub_

log files from coreboot (cbmem -c) -> cbmem_-c

the payload -> I dont know to get or find it.

and Linux -> Do you mean the output of dmesg?

output of `build/cbfstool build/coreboot.rom print -> 
cbfstool_t400_8mb_ukqwerty_vesafb.rom (I used cbfstool on the used 
pre-compiled rom)

I attached the EDID dumps from my non working and a working display as 
well.

I hope this helps, if you need further information please let me know 
and I will try to provide them.

If you still need the logs files from the payload and Linux please give 
me the commands I have to execute. I am kind of a noob using Linux.

Thanks again an best regards,

Kroms










Am 03.07.2015 23:19 schrieb Paul Menzel:
> Dear Kroms,
> 
> 
> Am Freitag, den 03.07.2015, 16:27 +0200 schrieb kroms at posteo.be:
>> 
>> I allready contacted Francis from libreboot and he forwared me to
>> this list, because it seems to be an issue regarding coreboot.
> 
> welcome and thank you for writing a message to the mailing list.
> 
>> 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
> 
> Please attach such information in the future instead of pasting it.
> 
>> 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
> 
> Ditto.
> 
>> Anyone is able to help?
> 
> Please send us your configuration (.config of coreboot and the payload)
> and the log files from coreboot (cbmem -c), the payload and Linux.
> That’s one of the advantages of using coreboot, that you have logs.
> Please also provide the output of `build/cbfstool build/coreboot.rom
> print`.
> 
> 
> Thanks,
> 
> Paul
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