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Go to settings. System>Power and Battery>Energy Recommendations and turn off "change brightness automatically when light around me changes". See if that helps.
Easier way to get there is System>Display and it should be under brightness.
Go to settings. System>Power and Battery>Energy Recommendations and turn off "change brightness automatically when light around me changes". See if that helps.
Easier way to get there is System>Display and it should be under brightness.