[Navy Doc]

Hello all,
Irritating issue with my idrive. I cannot for the life of me adjust the screen brightness. I’ve searched internet, searched here and cannot find an answer.
I am able to get to the display settings and adjust brightness. I can adjust the brightness, but nothing happens. The brightness doesn’t adjust and in addition it goes back to the previous setting which is in the middle (I assume that’s the default value).
I have tried it with the lights on, as described in the manual, and with the lights off. Same outcome. Idrive seems to be working properly. When I turn on headlights the screen dims for night mode and brightens when lights are turned off. I can change brightness of my instrument panel using the stalk.
Am I missing something.
Oh by the way it’s a 2007 335i e93. TIA.