[Bug 70256] [i915] invert_brightness on "8086:0116:103c:1854" is required

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70256

--- Comment #11 from Kirill Tkhai <tkhai at yandex.ru> ---
(In reply to comment #9)
> (In reply to comment #8)
> > (In reply to comment #5)
> > > So if you use invert_brightness, the polarity is reversed, right?
> > 
> > Everything is right. Tric from bug 70386 doesn't work for me: brightness is
> > not remembered between reboots, I have to increase it by hotkeys every boot.
> 
> What? So regardless of i915.invert_brightness setting, your brightness
> hotkeys work with the same, correct polarity?

In case of i915.invert_brightness set, the polarity is reversed.

Ok, it looks like I understood invert_brightness wrong.

The real problem is that initial brightness is zero. If I boot without
parameters:

$ cat /sys/class/backlight/acpi_video0/brightness
0

$ cat /sys/class/backlight/intel_backlight/brightness
0

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