https://bugs.kde.org/show_bug.cgi?id=494815

Jakob Petsovits <jpe...@petsovits.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
            Version|6.2.4                       |6.2.0
   Version Fixed In|                            |6.2.3
      Latest Commit|                            |https://invent.kde.org/plas
                   |                            |ma/kwin/-/commit/4f18aae673
                   |                            |209473fe3c85ae7b52bd9f85961
                   |                            |a14
             Status|REPORTED                    |RESOLVED

--- Comment #11 from Jakob Petsovits <jpe...@petsovits.com> ---
Re. original issue (Comment #0) filed by Arnab Bose: I believe this was a
symptom of KWin/Wayland using either hardware brightness or software brightness
adjustments, depending on what's available. It would work like this:

1. Hardware brightness controls are available for your screen, you set it to
e.g. 50%, then restart your session.
2. Hardware brightness controls somehow aren't getting initialized correctly,
but the screen is still at 50% hardware brightness. However, KWin doesn't know
about hardware brightness now, so it uses software dimming to reduce brightness
to 50%. Combined with the existing hardware brightness, this makes for only 25%
and explains why e.g. ddcutil won't restore brightness back to to 100% in that
session.

This was fixed in KWin by
https://invent.kde.org/plasma/kwin/-/merge_requests/6670 which was first
released with Plasma 6.2.3.

Not sure if we had a bug report or which one it was, I'll just close this as
fixed. If the original reporter (Arnab) still experiences this issue, please
reopen this bug with a status update of how your system is behaving now.

---

Oliver's dimming issue from Comment #10 is likely a different bug, which would
be fixed by https://invent.kde.org/plasma/powerdevil/-/merge_requests/466 (and
related MRs), shipping to users from Plasma 6.3 Beta 1 onwards. I'll regard
this as unrelated to the original report. Please open a separate bug if you
still find issues with this in Plasma 6.3.

Thanks!

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