HELP! Stuck in GNU Grub 2.04 Command when starting

[Sebo]

Happy to help
Want to laugh some more?

Now my Screen brightness control does not work anymore.
I had that all of a sudden during our "solving my problem"
And I fixed it by adding this
acpi_backlight=vendor"
at the end of this line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

and as Aravisian figured out I had to many " there but it made my brightness control work again.
Now my Problem is fixed but the bc is gone again

[Aravisian]

We can start a new thread for that...

[FrenchPress]

@Sebo

Now my Problem is fixed but the bc is gone again

You can start a new thread for that.