https://bugzilla.kernel.org/show_bug.cgi?id=77091

--- Comment #21 from Aaron Lu <aaron...@intel.com> ---
(In reply to Anton Gubarkov from comment #20)
> The proposed patch works for me. Brightness no longer changes on AC
> plug/unplug. I will check if midair brightness changes stopped during today.
> They happen most of the time when my battery is fully charged.
> 
> I also noticed that now I'm able to turn off backlight completely by F5
> button when I drive the brightness to a minimum value. This is minor thing,
> but anyway, I think that some minimum brightness should remain at the lower
> end.

If your acpi_video interface works and has 100 levels, I suppose it also has
this behaviour?
# cd /sys/class/backlight/acpi_video
# echo 0 > brightness

BTW, what is midair brightness change?

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