[Bug 96571] [CHV] Backlight init fails on Surface 3 if module load order is wrong

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96571

--- Comment #11 from viric at viric.name ---
This is the i915 code that tries to find the pwm-backlight controller:

http://lxr.free-electrons.com/source/drivers/gpu/drm/i915/intel_panel.c#L1636

that controller is added in drivers/video/backlight/pwm_bl.c , but not for ACPI
systems like my LPSS and, I guess, also this crystalcove. Someone should add
ACPI code to pwm_bl.c to handle those ACPI PWM devices, because it only works
for non-ACPI (very few x86, with devicetree, CONFIG_OF).

I have very little idea of kernel developing and I may be wrong, but that is
how I understand the situation.

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