https://bugs.kde.org/show_bug.cgi?id=484663

--- Comment #13 from Jakob Petsovits <jpe...@petsovits.com> ---
Also see https://invent.kde.org/plasma/kwin/-/merge_requests/5876 where I just
linked to this bug.

My current thinking is that it's important for us to get three aspects right:

1. Migration. Users currently have a percentage of the maximum brightness set
in their powerdevil profile config, often only for the Low Battery profile
because that's the default. Whichever behavior we pick, it should either work
with the existing config or allow an upgrade path that doesn't break
expectations.

2. Behavior of brightness keys, applet icon scrolling and applet pop-up
controls. When the user adjusts brightness for a brightness-reduced display,
will they adjust a temporary setting that will be restored once switching back
to (e.g.) AC Power, or will they adjust the baseline brightness setting. What
kind of behavior can be intuitive to the user while also resolving this issue.
How can the user "break out" of the temporary setting once the profile has been
activated.

3. Purpose. This is a permanent settings value, applied to a system with
dynamically adjustable baseline brightness. If the user is going to dynamically
reduce their display brightness at night, should the 30% setting result in a
maximum display power consumption (i.e. 30% or less of absolute brightness) or
a relative power savings (i.e. 30% of configured brightness, which might be
much darker)?

Let's answer these questions first and think about implementation later. I can
leave my own opinions for a future comment.

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