[arch-general] Nvidia backlight control - acpi_video0/brightness changes - display doesn't?

[Patrick Burroughs (Celti)]

On Sat, 19 Nov 2016 02:00:11 -0600
"David C. Rankin" <drankinatty at suddenlinkmail.com> wrote:
> [snip a whole bunch of maundering]

xrandr does not adjust the backlight. It adjusts the brightness, which
while it may have the same visible effect may have negative effects on
battery life and component wear compared to proper backlight adjustment.

acpi_backlight=vendor is the default, acpi_backlight=none is invalid.
The option you are looking for is acpi_backlight=video, which takes the
backlight control away from the vendor driver and hands it back over to
the standard ACPI backlight driver. This will generally solve the issue
you are having.

~Celti
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