[Bug 109398] booting gives black screen [drm:intel_dp_start_link_train] [CONNECTOR:67:eDP-1] Link Training failed at link rate = 162000, lane count = 2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109398

--- Comment #14 from Seppe <seppe.hoogzaad at gmail.com> ---
For me this can be marked as solved


I have changed/updated the BIOS to an UEFI one (and also updated the system).
This because the kernel sometimes failed to load a hibernate image. Errors in
dmesg then pointing at BIOS errors. These were the following two errors:

: Hibernate inconsistent memory map detected!
: PM: Image mismatch: architecture specific data

I was using the BIOS from the "Install/Update RW_LEGACY Firmware" option from
Mr Chromebox ChromeOS Firmware Utility Script
(https://mrchromebox.tech/#fwscript). I replaced this BIOS with "Full ROM
firmware" option from the same script. This essentially replaced the whole BIOS
with a new UEFI based one. This required me to remove the write-protect screw
from my Dell Chromebook.

After reinstalling the system (required because of the UEFI system) i found
that the new BIOS solved my hibernate problem, but also the black screen
problem described on the page here. This was surprising for me, since the
RW_LEGACY option is a normal option to use and i could not find bad side
effects of it on the internet. I did not thought that changing the BIOS would
also solve the "Black screen" problem described here. Else i would have tried
this earlier.

I can now conclude that also changing something in the BIOS, solves this
problem, apart from the "git revert 49218c83e25b6f0708f246b07d570b2c43a98223"
solution.

I will no longer be able to reproduce the error. Only by flashing back the
original BIOS and reinstall the system, this could be done. This is to much
work for me. 

I can not change the status to "solved", i therefore leave it as it is.

If additional information is required i can provide it.

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