Sony Xperia Ultra Z

[llamekuf]

The phone cannot be used outside - even in bright sunlight.
Brightness Level is set to Highest.
Adaptive Brightness is On
The screen is barely readable and very difficult to see.

[Gizmonster]

Try turning adaptive brightness off.
I've just tried it on my Z5 compact and mine is off. When I turn it on, the screen goes very dim.

[llamekuf]

Thank you GIZMONSTER, I tried that but, as soon as I stepped outside _
very cloudy and overcast _ the screen is very dim and unreadable.

[Gizmonster]

This might sound like a silly question, but after you turned the adaptive brightness off, did you try adjusting your brightness level as well, as you may need to turn it up as well??

[llamekuf]

Thanks again GIZMONSTER.
Yes.
The Brightness Level is at the highest level as is all the White Balance.

[Gizmonster]

On my white balance, the red, blue and green are all on 0.
If you've got them all set at max (255 on mine), it'll darken the screen - or at least it did on mine when I just tried it.

[llamekuf]

Again my thanks GIZMONSTER.
Brightness Level = Highest.
Adaptive Brightness = Off.
White Balances = 0
But, whilst there is an improvement when the weather is overcast, cloudy, during sunshine the picture is barely visible.