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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