[Bug 90075] [BYT LPSS backlight] Acer Aspire Switch 10 backlight control

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90075

--- Comment #13 from Miha Frangež <miha.frangez at gmail.com> ---
None of the patches posted here can be applied to the current mainline
(4.13.0-rc2) kernel. They didn't work for me on 4.6.0 either. As far as I know,
noone has ever managed to control the backlight of this laptop under Linux.

>From what I can tell (not a dev), the problem is with the LPSS PWM driver for
this device, not just the bwm_bl backlight driver.
There are no devices listed under /sys/class/pwm/ so even if pwm_bl works,
there is no pwm chip for it to use.

Here are the results of some of my testing: https://frangez.tech/switch10/ .
If there's any info missing, let me know.

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