grub console - asking for videoinfo or vbeinfo crashes grub

g4njawizard · 05-05-2020, 06:05 AM

Hello,

I wanted to edit the resolution of my grub menu, because it stucks at low resolution and u can barely see the kernel versions. As I red online, you can only set the Resolution, if its supported by grub and you can only find that out, if you enter the real grub.
Unfortunately every time I enter videoinfo or vbeinfo, the screen turns black for a couple of seconds and then returns back to the console. Both commands dont provide any output and I cant do anything from there except rebooting with ctrl+alt+del. The Default resolution from grub seems to be 640x480. I dont want to set another Resolution, if I dont know if its supported by grub.
The Version is GNU GRUB 2.04

I checked the BIOS Settings on my Lenovo ThinkPad, but they seem ok. "BIOS GRAPHICS Memory= 512" Boot= Legacy only and CSM on.

Thanks Forward for any help

edit: I played a bit around and changed the GRUB_GFXMODE to 1920:1080.
I've set the GRUB_CMDLINE_LINUX_DEFAULT=Video=1920x1080.
These Settings seem to affect only the Linux bootlog and Luks Password window.

berndbausch · 05-06-2020, 08:35 PM

If you also set GRUB_GFXPAYLOAD_LINUX=keep, the GRUB_GFXMODE setting will be used for Linux as well.

g4njawizard · 05-07-2020, 01:29 AM

I found that out already, but it doesn't seem to affect the Grub Menu. My config to show you what I've already done:

Code:

# 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="video=1920x1080 splash quiet ipv6.disable=1"
GRUB_CMDLINE_LINUX="mds=full,nosmt tsx=on tsx_async_abort=full,nosmt"


# 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
GRUB_GFXPAYLOAD_LINUX=keep
# 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"

Of course I didn't forget to update-grub. I broke grub so hard by playing around, that I had to reinstall my Machine, but I wanted to renew it anyway ...
But again after reinstalling on fresh cleaned disk, I receive the same results. The only setting that is taking effect is the default kernel and the timeout. The resolution stays the same. And I have to mention, that I dont use UEFI. I only have Linux on my Notebook installed with Legacy Boot Order.

Even a Live-USB is able to get a higher resolution in the boot menu