OLED panel brightness support

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Hi,

Currently, OLED panel brightness [1] is not supported.
We have a similar Dell system that also affect by lack of OLED brightness support.

I’ve investigated both kernel and user space but I haven’t found a good general solution yet. Dell systems use EDID descriptor 4 as Dell specific descriptor, which reports its panel type and we can know it’s an OLED panel or not.

My initial thought is to add a new attribute “oled" in drm_sysfs.c [2] to let userspace like clutter [3] to control the brightness. However other DEs may need to implement their own OLED brightness support which isn’t ideal.

So I’d like to know if there’s any good way to support OLED brightness in good old backlight sysfs, to let userspace keep to the current interface.

[1] https://bugs.freedesktop.org/show_bug.cgi?id=97883
[2] https://pastebin.ubuntu.com/p/QYrRBppVT9/
[3] https://gitlab.gnome.org/GNOME/clutter/blob/master/clutter/clutter-brightness-contrast-effect.c#L559

Kai-Heng
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