Hi all W850i user. I have a probably stupid question regarding my friend W850i

He just bought it this year and the firmware is R1GB001. The problem is, when the phone is near light area, the screen get brighter, but when we cover the light sensor or go to darker place the screen and keypad light will be dimmer... i don't think W810 did this, but this is really ridiculous... any suggestion? or it;s normal?

not only N73, even W810 works the correct way as other phone did. I've search previous thread but they did not mention the anomalies of light sensor like what has happened to my friend one...

brighter light should be dimmer, darker place should be brighter... too bad, my friend W850:x

thank you for the infos
my friend was so stress regarding his screen because he put it at 50% like me to prolong battery life... and then dimmer summore.. well, the screen was like 50% brightness on my W550i!