[Bug 99126] [945GME] wrong scale for backlight with Xfce

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99126

--- Comment #11 from Rpnpif <rpnpif at free.fr> ---
(In reply to Jani Nikula from comment #10)
> How does /sys/class/backlight/eeepc/brightness work when used directly? Do
> all values work as expected? The userspace should prefer the platform type
> backlight interfaces over raw type that intel_backlight is.

Yes and no, as I said previouly: 

Before the last release of xserver-xorg-video-intel:
When I press on the hotkey to increase the brightness, the values in
/sys/class/backlight/eeepc/brightness increased with a step of 2 (0, 2, 4, ...,
15).
The brightness changed from low value but without a light off screen, to a
maximum as expected. All changes of brightness are proportional of the value of
the brightness parameter as expected.

With the last release of xserver-xorg-video-intel:
When I press on the hotkey to change the brightness, the values in
/sys/class/backlight/eeepc/brightness increase with a step of 1 (0, 1, 2, 3,
..., 15).
The 0 or 1 values get a light off screen.
The 15 value has a strange behaviour. When 15 value is reached the brightness
is at the maximum. But a new press on the increasing hotkey get a few lower
brightness without change of the 15 value. The following press of the
increasing hotkey does not change anything but does not get the brightness
maximum.

The decreasing hotkey has the same effect but on a reverse order, obviously.

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