Grub-shell in grub operations start iso and grub repair, brightness cannot be adjusted

Grub-shell to start iso and grub repair, brightness cannot be adjusted to solve 1. grub repair: assume that the boot is mounted to a separate partition.

Grub-shell in grub operations start iso and grub repair, brightness cannot be adjusted

I. grub repair:

Assume that the boot partition is mounted to/dev/sda3.

Sudo mount/dev/sda3/mnt

Sudo grub-install -- boot-direcotry =/mnt/dev/sda

Sudo update-grub

Sudo reboot

This can be solved in general. if it cannot be repaired, it means that the master program in the mbr zone has been damaged.

In grub shell:

Grub> ls (hd0, 2)

Confirm it is a boot partition

Grub> set root = (hd0, 2) or root (hd0, 2)

Grub> setup (hd0)

Grub> quit

Restart.

II. start the iso image using grub-shell

Grub> root/path/to/hava/ISOimage

Grub> replace loopback loop/iso_imagename with your iso file name

Grub> linux (loop)/casper/vmlinuz. efi boot = casper iso-scan/filename =/iso_imagename noprompt noeject

Grub> initrd (loop)/casper/initrd. lz

Grub> boot

III. linux brightness adjustment solution:

So we only need sudo nano/etc/default/grub,

GRUB_CMDLINE_LINUX = "" changed to GRUB_CMDLINE_LINUX = "acpi_osi =LiNux acpi_backlight = vendor "restart,Note that L in Linux is in uppercase..

Then sudo update-grub & sudo reboot

You can also refer to the original post on my blog