Ubuntu Grub2 Refresh Rate Problems
I had to make a few changes to /etc/default/grub to get Ubuntu 14.04 to boot with a working console. Initially, my monitor just went dark.
Changes with reasons:
GRUB_HIDDEN_TIMEOUT: if you want to see the Grub menu, this must be commented out.
GRUB_CMDLINE_LINUX: allows passing parameters to the linux startup command. Newer kernels (>3.5? or so) reinitialize the graphics card. My AMD Radeon something-or-other didn’t like this at all. nomodeset forces linux to use/keep BIOS graphics settings.
GRUB_GFXMODE: select resolution for Grub graphical starup. 1280×1024 works on my aging ViewSonic. This setting is for the Grub menu.
GRUB_GFXPAYLOAD_LINUX: specifying keep, causes Grub to keep using the previous resolution (from GRUB_GFXMODE) for the rest of the boot.
NB: after making any changes, remember to update-grub (or nothing will happen).
Contents of my /etc/default/grub after making required changes:
# If you change this file, run 'update-grub' afterwards to update
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
# 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 …)
# Uncomment to disable graphical terminal (grub-pc only)
# 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’
# Uncomment if you don’t want GRUB to pass “root=UUID=xxx” parameter to Linux
# Uncomment to disable generation of recovery mode menu entries
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE=”480 440 1″