Comment 7 for bug 1814938

hey there, I have the exact same problem, but I couldn't find a solution yet.
I included the edid file using the script given above:

lsinitramfs /boot/initrd.img-5.11.0-25-generic | grep edid
usr/lib/firmware/edid
usr/lib/firmware/edid/edid.bin

my grub config looks like this:

cat /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash drm.edid_firmware=edid/edid.bin"
GRUB_CMDLINE_LINUX_DEFAULT="drm.edid_firmware=edid/edid.bin quiet splash"
GRUB_CMDLINE_LINUX=""

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=1920x1080-24

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

and dmesg logs the following:

sudo dmesg | grep edid
[ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-5.11.0-25-generic root=UUID=79d59e63-ceea-4975-abf4-b34964ea06c0 ro rootflags=subvol=@ drm.edid_firmware=edid/edid.bin quiet splash vt.handoff=7
[ 0.050890] Kernel command line: BOOT_IMAGE=/vmlinuz-5.11.0-25-generic root=UUID=79d59e63-ceea-4975-abf4-b34964ea06c0 ro rootflags=subvol=@ drm.edid_firmware=edid/edid.bin quiet splash vt.handoff=7

Though, I still have a low monitor resolution at boot time, which becomes correct when completely booted.
Have I missed anything here?
I'm using Ubuntu 21.04.

I already tried to get the edid file using the nvidia control panel and the read-edid tool, both didn't work.