Backlight control (Sharks Cove schematics)

[Nicolas Huillard]

Le dimanche 03 juillet 2016 à 20:10 +0100, Paul Mansfield a écrit :
> this is very interesting, thanks for trying and letting us know, it
> gives hope that a solution will be found.
> 
> do you think it'd be possible to put the backlight driver into the
> initrd so that it gets loaded during boot, and ensure the i915 driver
> has to be loaded from
> /lib/modules/$version/kernel/drivers/foo/bar/baz.ko ?

The config workaround at the top of the bug report seems to do nearly
that, instead compiling in-kernel the PWM stuff (y), to make it executed
before i915 (m) :

>As a workaround, these config options worked for me on Surface 3 PMIC
backlight:
>
>CONFIG_PWM=y
>CONFIG_PWM_CRC=y
>CONFIG_I2C_DESIGNWARE_PLATFORM=y
>CONFIG_I2C_DESIGNWARE_PCI=y
>CONFIG_INTEL_SOC_PMIC=y
>CONFIG_DRM_I915=m

-- 
Nicolas Huillard