Automatic dimming of p500 does not work (corrected from V3.9)

Corrected from:
p500 controller V3.9

Response of the new version:

The display of the p500 controller is automatically dimmed after the time set in C424.

What happens?
The display of the p500 controller is not automatically dimmed after the time set in C424.

When does this behaviour occur?

For the p500, automatic dimming does not work.

Which produdcts are affected?
p500 controller V3.3

Short-term measures:

None

Evaluation/recommendations:
Automatic dimming of the p500 display does not work.