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psksvp/gist:9f931dc171be90298383823bf6138b9c

Created January 10, 2020 09:44
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fix screen brightness cannot be adjusted probelm on 2103 iMac with Ubuntu 18.10
Raw
gistfile1.txt
open the file */etc/default/grub* with a text editor with sudo
change the line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
saved, then run
sudo update-grub
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