Use Brightness keys to adjust Contrast

[geychaner-LBT]

I have an unusual request. I have a G3223Q Dell Gaming monitor connected to a Mac (16-inch 2019 MacBook Pro) using DisplayPort (USB-C to DisplayPort). When the DisplayPort is connected, the monitor brightness cannot be adjusted through DDC or the OSD; it is locked at 75%. The contrast, in contrast, can be adjusted. Therefore, I would like to control the contrast via the brightness keyboard keys, but could not find any way to set this.

[waydabber]

If you want to remap the brightness DDC control to contrast, simply override the control code for brightness (from 10 change it to 12). You can do so under DDC Features... under the display's settings.

[geychaner-LBT]

That works! Thanks so much for the assistance! I'd really like to know why the DisplayPort locks the brightness at 75%, but that's not apparent in the user manual or anywhere else I've looked. It could have to do with the fact that I'm using a Mac and therefore can't load Dell's Display Manager. I admit I bought this monitor knowing it wasn't super Mac-friendly.

[waydabber]

Not sure either. Are you running the display in HDR mode? If so, that might be a reason (some displays do that). An other reason might be some kind of preset that is configured in the display. Generally Dell displays tend to work fine with DDC.

[geychaner-LBT]

That was it. "Smart HDR" was turned on. Until I bought this monitor, I didn't even know what HDR was, and I don't need it.

[Hr46ph]

I found this question because I was trying something similar. Both brightness and contrast can be adjusted in my case, but for contrast I don't have hotkeys. I was thinking to use control with brightness up/down, but its not accepted under Settings / Keyboard.

I tried other combinations but it seems the brightness keys are simply not accepted, is that correct?

[waydabber]

If this is DDC contrast, then you can simply use the brightness keys for brightness control but redefine the brightness control code to contrast. You can also combine brightness+contrast by providing two codes.