Mobian screen dims

[JustineSmithies]

hmm....
I have had my best results with :   first Debian/Phosh    and now with Mobian.

If you have time on the app drawer screen, go to settings  >  power  > 'automatic brightness' and turn automatic 'off'

You say you have 'no issues' with the other  OSes ?    just Mobian ?

  I am sorry to hear you are have such a frustrating problem just starting up your new phone.

It doesn't give me enough time to get to the settings. I have noticed if i re edit that file and set ambient mode to true that i briefly after unlocking see the app draw before the screen goes grey. If it is set to false i don't briefly see the app drawer. Does that help ???

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Right, so last idea that comes to my mind: remove /etc/udev/rules.d/10-proximity.rules
Maybe your proximity sensor is acting up, it happened before...

Bingo ! The above fixed the issue thank you so much.

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Spoke too soon.  

Screen has dimmed now so i'll go back and add the ambient line and test.

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Right I seem to have got it now. I ad to remove the proximity rule and set the ambient mode to false. Then quickly go to settings and turn off auto brightness as the screen started dimming every second. Now the display stays on.