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I can't adjust the contrast on my laptop dell and I found this on this site:

Open the terminal Ctrl+Alt+T and type:

sudo gedit /etc/default/grub

Change the line:

GRUB_CMDLINE_LINUX=""

into

GRUB_CMDLINE_LINUX="acpi_osi=Linux"

Save and exit the file.

Now in the terminal type:

sudo update-grub

Restart your Linux.

But when I type sudo update-grub it says:

/usr/sbin/grub-mkconfig: 35: /etc/default/grub: Syntax error: Unterminated quoted string
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1 Answer 1

I think you are missing a closing double quote in that line. Please check for that.

If not, this well-written page should help you out. While it is written for HP, the procedure should work for any laptops. It is a common procedure for linux kernel.

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