Actually I found that the other files in /usr/X11/xorg.conf.d containing
a section "Device" were not shipped with any package, so I merged all
options in a single file in /etc/X11/xorg.conf.d with also a "Screen"
section. Here is its content:
===========================================
Section "Screen"
Identifier "Laptop Screen"
Device "Intel Graphics"
Monitor "LVDS Monitor"
EndSection
Section "Monitor"
Identifier "LVDS Monitor"
Gamma 0.70 0.72 0.68
EndSection
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
# Option "AccelMethod" "uxa"
Option "Backlight" "intel_backlight"
Option "monitor-LVDS1" "LVDS Monitor"
BusID "PCI:0:2:0"
EndSection
===========================================
Now the driver correctly uses the intel_backlight interface and I'm able
to adjust backlight again, so the bug is now just that it just ignores
options on the kernel command line, while on Jessie the same options are
taken into account.
Kind regards
Massimo Maiurana
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