[Bug 84561] [ivb] Intel backlight does not adjust, but only turns on/off in kernel 3.16 on Samsung 880Z5E laptop

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=84561

--- Comment #15 from Laszlo KREKACS <laszlo.krekacs.list at gmail.com> ---
I'm sorry for the typo I made in comment #13, here is it correctly:
After using "video.use_native_backlight=0", and checking against:
echo "5" > /sys/class/backlight/acpi_video0/brightness #WORKS
echo "5" > /sys/class/backlight/acpi_video1/brightness #WORKS
echo "5" > /sys/class/backlight/intel_backlight/brightness #NOT WORKING

Under ubuntu 14.10, the hotkeys indeed do control the brightness (along with
OSD feedback), after I removed from /etc/X11/xorg.conf.d/xorg.conf file (with
"video.use_native_backlight=0" in grub):

# Fix Backlight issue
# Section "Device"
#     Identifier  "card0"
#    Driver      "intel"
#    Option      "Backlight"  "acpi_video0"
#    BusID       "PCI:0:2:0"
# EndSection

For me, with this workaround, the laptop is working as intended. 
But I will check back regularly, if there are help need for testing.

I'm glad I found this bug:)

OFFTOPIC: 
Vitaliy, can I contact you privately, since you have the same laptop as I, and
you also using linux on it?
I have some issues left, what I want to solve with this laptop, namely:
- touchegg does not recognize 2,3 fingers swipe, only 4 fingers swipe
- three finger click is indeed the middle mouse button, but I can't use it for
dragging (many program use it for panning, gimp, inkscape, Freecad to name a
few).
I would gladly cooperate with someone.
Maybe together would be easier to hunt down these remaining issues.

Otherwise the laptop is in parity with Macbook Pro.

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