In a scene where certain lights are turned off, moving the brightness slider turns those lights on even when sliding the brightness down

[recklessnl]

This is also a very annoying bug in Home Assistant itself - imagine a room with ceiling lights and a desk lamp. In one Hue scene, all the ceiling lights are turned off, but the desk lamp is on. When I activate the scene through Hass or the lovelace-hue-like-light-card, it works perfectly - the desk lamp is on, the ceiling lights all off.

However, when I then want to change the brightness using the slider, it will turn all the ceiling light on, to that brightness. This is really annoying because it's not how Hue works in the app. In the app, using the brightness slider will only affect the brightness of the lights that are currently on (in this case, the desk lamp). This is the functionality I want - using the brightness slider to change the brightness of the desk lamp, and not the lamps that are specifically turned off in that scene.

Is this possible at all?

[transce080]

I agree 100%. In order to be a hue-like control, it needs to work the way the original sliders work. To restate what @recklessnl said in more formal terms:

• If the slider control is activated on a group
• When every light in the group is set to on or off
• Then all the lights will be set to the slider value

vs.

• If the slider control is activated on a group
• When at least one light is not set to on
• Then only the lights which are already on will be set to the slider value