MacOS keyboard preference can remap keys for individual keyboard. This is not a global key remapping, it will not impact other keyboards except the one selected.
How-To: Remap Windows keyboards to match the Mac keyboard layout
For hidden menu, it can be accessed by holding down the Shift key at the very start of the boot-up process.
If still cannot be started, then provide following lines in /etc/defaults/grub could fix the issue.
GRUB_TERMINAL_OUTPUT="console"Power down monitor can be done via command line as below.
setterm --blank 1 --powerdown 2It blanks screen after 1 min and turn it off after 2 min.
By adding the kernel parameter consoleblank=60 will lets screen off in 60 seconds if no one touch it.
/boot/grub/grub.cfgRun following command can regenerate /boot/grub/grub.cfg using /etc/defaults/grub
update-grub
# or
update-grub2/boot/efi/EFI/ubuntu/grub.cfgRun following command can update this file according to current envirnment structure.
dpkg-reconfigure grub-efi-amd64It is also update /boot/grub too.
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How to Configure the GRUB2 Boot Loader’s Settings