Backlight with 4.12: working

[Wessel Dankers]

Hi,

On 2017‒07‒09 12:10:02+0200, Nicolas Huillard wrote:
> 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

For a different method, see my e-mail dated May 27, repeated here for
convenience:

---

One more thing: to get working brightness controls I had to add
pwm_lpss_platform to /etc/initramfs-tools/modules to force a module loading
order (otherwise I'd get “failed to own the pwm chip” from the i915 drm
driver).

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

---

cheers,

-- 
Wessel Dankers <wsl at fruit.je>

Sent from my general purpose computing device.
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