https://bugzilla.kernel.org/show_bug.cgi?id=153401

--- Comment #30 from Luca Viggiani <lviggi...@gmail.com> ---
Kernel 4.7.2, BIOS option ON, acpi_backlight=video:

Brightness now does not change anymore:
/sys/class/backlight/acpi_video0/brightness changes
/sys/class/backlight/intel_backlight/brightness **does not** change
actual video brightness stays to 100%

/sys/class/backlight/acpi_video0/actual_brightness:75
/sys/class/backlight/acpi_video0/bl_power:0
/sys/class/backlight/acpi_video0/brightness:75
/sys/class/backlight/acpi_video0/max_brightness:100
/sys/class/backlight/acpi_video0/type:firmware
/sys/class/backlight/intel_backlight/actual_brightness:4882
/sys/class/backlight/intel_backlight/bl_power:0
/sys/class/backlight/intel_backlight/brightness:4882
/sys/class/backlight/intel_backlight/max_brightness:4882
/sys/class/backlight/intel_backlight/type:raw

...I'm going to reboot and test without the acpi_backlight=video kernel
param...

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