By default, the screen and energy settings in Android don’t take effect during a call. The screen always dims after a few seconds and then stays blank, no matter how you configured it in the settings.
With “normal” phones this feature may be okay, but e.g. with a tablet like Samsung Galaxy Tab it can be annoying when using the loudspeaker or a headset.
Solution:
Install the app Caffeine. This was the only way I found to make the display stay awake during a call.
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