SOLVED.
Reponding to Kai-Heng question, the edid file was not in initramfs and I
didn't know how to add it at the time.
I was using another monitor the last months and didn't encounter this problem.
This week I connected the monitor and found the same problem again, this time
with Ubuntu 19.10 a
It seems this problem could be relate to 1814938
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https://bugs.launchpad.net/bugs/1762122
Title:
drm_kms_helper.edid_firmware not working anymore on Ubuntu 18.04
Status in
Public bug reported:
My HP LP2475W monitor reports incorrect EDID info resulting in bad image
quality.
It can be fixed with a customized edid file, and adding
drm.edid_firmware kernel boot parameter.
But in Ubuntu 18.04.1 and Ubuntu 18.10, if crypsetup-initramfs package
is installed, it fails to
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