[coreboot] T400 screen issue / EDID handling

[kroms at posteo.be]

Dear Paul,

> I am sorry for the long delay.

No problem, I am very happy that you are still trying to help!

> Thank you! Unfortunately, it also does not contain the Git revision.
> 
>     #define COREBOOT_ORIGIN_GIT_REVISION "Unknown"
> 

I dont´t know if you noticed that Francis wrote in this thread on Sun 
Jul 5 16:57:30 CEST 2015:

"Libreboot builds coreboot without the .git directory, so it's not
possible to get the coreboot revision. You can find out what version
of coreboot it is by looking at
resources/scripts/helpers/download/coreboot

He is using libreboot 20150518, so the coreboot revision that he's
using is e19c8b0091022ae3f490601aed0c290cd5171b79"

> 1. Try to use a newer Linux kernel.

I updated the Kernel to 4.1.2 from Debian experimental.

> 2. Turn on debugging of the Linux i915 module [1].

> 3. Please also post a log with debugging enabled when using the vendor
> firmware.

Please find attached the two outputs (libreboot and lenovo_bios) from 
dmesg with debugging enabled.

Thanks again,

Kroms

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