How to change Grub menu resolution?

[igorek24]

When my laptop boots, right after the BIOS post I get Grub menu and resolution is way off. I cant even see full menu. How can I change it to fit my monitor? I tried to search the web and tried to change /etc/default/grub and rebuild it but no success.
Note, it is efi

[lightman47]

On that monitor there should be a button, or menu selection, to "auto-config" the monitor. The problem is that the menu isn't centered in Text mode which is why it's running off the screen.

[igorek24]

On that monitor there should be a button, or menu selection, to "auto-config" the monitor. The problem is that the menu isn't centered in Text mode which is why it's running off the screen.

Thanks for the reply, this is a laptop and I don't have a way to "auto-config".

[lightman47]

Walked right into that one - sorry! I can see it now that you brought to my attention. Having been there with one of my flat screens ...

[igorek24]

I don't care much about the menu, it's when I'm trying to edit the grub config, I cant see the whole thing, that's my problem.

[anderson_thomas]

Hi igorek24,

GRUB2 - Boot-Resolution:

/etc/default/grub --> ADD: GRUB_CMDLINE_LINUX_DEFAULT="video=1024x768"

----- My - /etc/default/grub -----

Code: Select all

GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
# Tachtler
# default: GRUB_TERMINAL_OUTPUT="console"
# GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rd.lvm.lv=server/swap crashkernel=auto  vconsole.font=latarcyrheb-sun16 rd.lvm.lv=server/root vconsole.keymap=de quiet"
GRUB_DISABLE_RECOVERY="true"
# Tachtler: 2014-10-10
GRUB_CMDLINE_LINUX_DEFAULT="video=1024x768"
GRUB_GFXMODE=1024x768
GRUB_GFXPAYLOAD_LINUX=keep

After the changes in the configuration, you have to do this:

Code: Select all

cp -a /boot/grub2/grub.cfg{,.orig}
grub2-mkconfig -o /boot/grub2/grub.cfg
reboot

That's it - hope this works and help?

[igorek24]

Hi igorek24,

GRUB2 - Boot-Resolution:

/etc/default/grub --> ADD: GRUB_CMDLINE_LINUX_DEFAULT="video=1024x768"

----- My - /etc/default/grub -----

Code: Select all

GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
# Tachtler
# default: GRUB_TERMINAL_OUTPUT="console"
# GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rd.lvm.lv=server/swap crashkernel=auto  vconsole.font=latarcyrheb-sun16 rd.lvm.lv=server/root vconsole.keymap=de quiet"
GRUB_DISABLE_RECOVERY="true"
# Tachtler: 2014-10-10
GRUB_CMDLINE_LINUX_DEFAULT="video=1024x768"
GRUB_GFXMODE=1024x768
GRUB_GFXPAYLOAD_LINUX=keep

After the changes in the configuration, you have to do this:

Code: Select all

cp -a /boot/grub2/grub.cfg{,.orig}
grub2-mkconfig -o /boot/grub2/grub.cfg
reboot

That's it - hope this works and help?

Thanks for the reply. I already tried that and it changes my resolution after the grub menu but doesn't fixes my grub menu problem.

BTW, I'm on UEFI so I would use

Code: Select all

grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

to build my grub.cfg

[anderson_thomas]

Hi igorek24,

you add these lines too:

Code: Select all

# Tachtler: 2014-10-10
GRUB_CMDLINE_LINUX_DEFAULT="video=1024x768"
GRUB_GFXMODE=1024x768
GRUB_GFXPAYLOAD_LINUX=keep

At my server (is must say under KVM) it's sill working. Screen resolution changes while booting CentOS-7 to 1024x768.

Thank you for UEFI description!

[igorek24]

No dice. That didn't help. I guess I'll just suck it up and ignore it.

[myootnt]

Thanks. This solved my problem of the OS booting up with a 720x400 con resolution while connected to a cheap Iogear KVM and Lantronix Spider. Now to fix the mouse sync in X...