Backlight with 4.12 : working

[Nicolas Huillard]

Hi all,

I finally compiled my own 4.12 kernel, which "works for me".
I'll try to separate subjects in order to make the archive more
searchable (maybe we can have a definitive status page for the TCM, as
it seems that things are settling down cleanly now).

Working backlight control :
* activate the following kernel config :
	CONFIG_PWM_LPSS=y
	CONFIG_PWM_LPSS_PLATFORM=y
* actually compile-in those (don't create modules, ie. "=y" instead of
"=m"), to be sure that the i915 driver finds the LPSS PWM driver when it
initializes, as there is no dependency on those two items
* see https://bugs.freedesktop.org/show_bug.cgi?id=96571 for details

-- 
Nicolas Huillard