https://bugs.kde.org/show_bug.cgi?id=490274

            Bug ID: 490274
           Summary: The interval for adjusting the volume with keyboard
                    keys is adjustable, but the display brightness and
                    keyboard backlight controls are not.
    Classification: Plasma
           Product: plasmashell
           Version: 6.1.2
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: Brightness and Color
          Assignee: plasma-b...@kde.org
          Reporter: anhollander...@gmail.com
                CC: natalie_clar...@yahoo.de
  Target Milestone: 1.0

SUMMARY
It is possible to change the amount that the volume is adjusted when using the
keyboard volume controls, yet is not possible to do the same for display
brightness and keyboard backlight controls. The display brightness control is
locked to intervals of 5%, and the keyboard backlight control is locked to
intervals of 20%, even when the hardware supports more granular control. In
order to get values in between, you must pull up the Brightess and Color widget
and adjust the slider by hand. This is inconsistent behavior and also
inconvenient.

STEPS TO REPRODUCE
1. Right click on the Audio Volume widget. Click "Configure Audio Devices...".
Click "Configure Volume Controls...". Observe  that there is a "Volume change
step" setting.
2. Right click on the Brightness and Color widget. Click "Configure Brightness
and Color...". Observe that there is no such setting for display brightness and
keyboard backlight.
3. Open System Settings > Power Management. Observe that there is no such
setting for display brightness and keyboard backlight. 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 40
(available in About System)
KDE Plasma Version: 6.1.2
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2

ADDITIONAL INFORMATION
Another super trivial thing: With keyboard backlights that only have 3 states,
such as some newer ThinkPads, it makes more sense to represent the backlight
setting as something like off, medium, and high, instead of 0%, 50%, and 100%.

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