[coreboot] T400 screen issue / EDID handling

[Paul Menzel]

Dear Kroms,


I am sorry for the long delay.

Am Sonntag, den 05.07.2015, 17:05 +0200 schrieb kroms at posteo.be:

> > It might be in the revision file in CBFS.
> > 
> >     build/cbfstool build/coreboot.rom extract -n revision -f revision.txt
> 
> Please find attached the revision.txt.

Thank you! Unfortunately, it also does not contain the Git revision.

    #define COREBOOT_ORIGIN_GIT_REVISION "Unknown"

> > > and Linux -> Do you mean the output of dmesg?
> > 
> > Indeed, that’s one way of getting them. Please provide the output.
> 
> It is also attached. I hope the information will help you to get 
> closer to the solution.

Thank you! Unfortunately, no useful i915 message are in there. Three
things to try and do.

1. Try to use a newer Linux kernel. Trying to fix the Linux kernel is
much easier and more likely, if the reports are against the latest
version. Do you have a spare disk with a newer Linux kernel
installed?Debian Sid/unstable currently ships Linux 4.0.8. Linux 4.1
could be installed from the Debian experimental archives.

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

> To obtain a dmesg with debug information, add drm.debug=0xe to your
> kernel command line or, if you have display issues with kernel 4.1
> or newer, use drm.debug=0x1e log_buf_len=1M instead. Then, reboot
> and reproduce the issue again. Make sure to attach the full dmesg
> all the way from boot.

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


Thanks,

Paul


[1] https://01.org/linuxgraphics/documentation/how-report-bugs
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