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 and Kubuntu 19.10.
This time I was using an encrypted root partition so the edid file must
be in the initfd file to be found by the kernel.
I managed to include it by creating a file named
/etc/initramfs-tools/hooks/edid with this content:
-----------
#!/bin/sh
PREREQ=""
prereqs()
{
echo "$PREREQ"
}
case $1 in
prereqs)
prereqs
exit 0
;;
esac
. /usr/share/initramfs-tools/hook-functions
# Begin real processing below this line
mkdir -p "${DESTDIR}/lib/firmware/edid"
cp -a /lib/firmware/edid/modified_edid.bin
"${DESTDIR}/lib/firmware/edid/modified_edid.bin"
exit 0
-----------
The file needs execution permission: chmod +x /etc/initramfs-tools/hooks/edid
And initrd must be updated: update-initramfs -u
After that "lsinitramfs /boot/initrd.img-5.3.0-40-generic | grep edid"
shows the file included.
With this the kernel is able to load the file at boot, and the monitor
works nicely.
I suppose the source of this bug is me not knowing how to manage Ubuntu boot
process, so if no one more is affected by this problem I think the bug can be
closed.
Thanks.
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https://bugs.launchpad.net/bugs/1814938
Title:
drm.edid_firmware fails to load firmware where crypsetup-initramfs is
installed
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