[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 #10 from Aaron Lu <aaron.lu at intel.com> ---
(In reply to Laszlo KREKACS from comment #8)
> $ cat /proc/cmdline
> BOOT_IMAGE=/boot/vmlinuz-3.16.0-21-generic.efi.signed
> root=UUID=ba121a25-b094-49f5-96bf-ade769938060 ro quiet splash
> video.use_native_backlight=0 vt.handoff=7
> 
> This one does not work. (worked for the reporter?)

On Vitaliy's system, the acpi_videoX interface works while the intel_backlight
doesn't. Is your system the same? From your description, it seems none of the
interfaces work. And since which kernel version you start to have this problem
or you always have this problem?

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