Hi there.
I have a TCL smartTV 32s5400af and I am using Ubuntu Jammy with KDE Plasma and X11 works fine.
But when I press alt + f3 for instance, I got nothing but a message complain about HDMI resolution.
I want a way to set the cli resolution.
Here the grub conf I am using right now:

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=4
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash kvm-intel.nested=1 apparmor=0 loglevel=3 systemd.show_status=auto rd.udev.log_level=3 module_blacklist=r8169 radeon.
dpm=1"
GRUB_CMDLINE_LINUX=""

If your computer has multiple operating systems installed, then you

probably want to run os-prober. However, if your computer is a host

for guest OSes installed via LVM or raw disk devices, running

os-prober can cause damage to those guest OSes as it mounts

filesystems to look for things.

GRUB_DISABLE_OS_PROBER=true

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_TERMINAL_OUTPUT=console
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=1920x1080x32@30

GRUB_GFXMODE=auto

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"

root@karis:/home/gilberto# 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=4
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash kvm-intel.nested=1 apparmor=0 loglevel=3 systemd.show_status=auto rd.udev.log_level=3 module_blacklist=r8169 radeon.
dpm=1"
GRUB_CMDLINE_LINUX=""

If your computer has multiple operating systems installed, then you

probably want to run os-prober. However, if your computer is a host

for guest OSes installed via LVM or raw disk devices, running

os-prober can cause damage to those guest OSes as it mounts

filesystems to look for things.

GRUB_DISABLE_OS_PROBER=true

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_TERMINAL_OUTPUT=console
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=1920x1080x32@30

GRUB_GFXMODE=auto

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"

Thanks for any tips.