[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

Luca Sica <sluca691 at gmail.com> changed:

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                 CC|                            |sluca691 at gmail.com

--- Comment #33 from Luca Sica <sluca691 at gmail.com> ---
Hello,
Bug is affecting also Samsung Ativ Book 4 (model NP450R5E).

I quickly checked out the patch posted above but as written in the code (I am
no expert) I assume it is only for the models specified earlier.

Anyways I found a quick workaround that should work with every NPXXX model.

I used the suggestion indicated above by Jani Nikula and so I have set the
kernel parameter video.use_native_backlight=0 instead of value 1.

This let the kernel loading acpi_video0 but it didn't work yet. I manually
edited 20-intel.conf with acpi_video0 instead of intel_backlight and I
rebooted.
Well now it works perfectly!

Indeed it is a bug, but for now I hope this helps!

Bye

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