A list of D-Bus names for each display with brightness controls available. Per-display methods take a display name as parameter. Child objects of type "org.kde.ScreenBrightness.Display" are available at the object path "/org/kde/ScreenBrightness/[name]", with [name] being any of the elements of this list. The display whose brightness controls became newly available. The display whose brightness controls became unavailable. Adjust display brightness for a predetermined set of displays by a delta between -1.0 and 1.0. Boolean options, combined in a single value with binary OR (pass 0 for default behavior). 0x1: SuppressIndicator - don't show brightness change indicators such as OSD, notification, etc. ("silent mode"). Adjust display brightness for a predetermined set of displays by a delta between -1.0 and 1.0, with extra context passthrough. Arguments other than source_client_context are the same as in AdjustBrightnessRatio. Will be passed through to any resulting BrightnessChanged signal. Adjust display brightness for a predetermined set of displays by a step up or down the brightness scale. The direction and size of the step 0: Increase - raise brightness by a regular step. 1: Decrease - lower brightness by a regular step. 2: IncreaseSmall - raise brightness by a small step. 3: DecreaseSmall - lower brightness by a small step. Boolean options, combined in a single value with binary OR (pass 0 for default behavior). 0x1: SuppressIndicator - don't show brightness change indicators such as OSD, notification, etc. ("silent mode"). Adjust display brightness for a predetermined set of displays by a step up or down the brightness scale, with extra context passthrough. Arguments other than source_client_context are the same as in AdjustBrightnessStep. Will be passed through to any resulting BrightnessChanged signal. The display for which a brightness change was performed or observed. The updated brightness value. Note that not all types of displays allow external brightness changes. The actual screen brightness may be a different one than the one that was last emitted by this signal. The client (bus address) that requested the brightness change. The context string passed through from a brightness change method, or an empty string if no context was passed. The display for which the brightness range changed. The updated maximum brightness value. The current brightness value within the updated scale from 0 to max_brightness.