Is there a light sensor on X220 IPS screen?

[psychopomp1]

Hi
I have the X220 with the IPS screen and sometimes the screen just goes dim for a few seconds, if i move the mouse normal brightness returns. Is there an ambient light sensor or perhaps my screen is faulty?
Cheers
psycho

[Commander Wolf]

There is no ambient light sensor on the x220.

How dim is dim? No backlight dim or brightness 0 dim?

[psychopomp1]

Thanks, my normal brightness is set at 7 but when the screen goes dim brightness level goes to about 3. Why is this happening?

[MidnightSun]

No, the X220 does not have an ambient light sensor.

Two possible reasons for the described behavior:
1). You have the auto-dimming setting on. You can go to Power Manager and turn off the Dim Display setting under Idle Timers (Advanced mode).

2.) Check your Intel integrated graphics settings; there's a power-saving feature that dims the display (especially on darker images) to save power. Not exactly sure what it's called for Intel, but AMD's equivalent is "VariBright."

[psychopomp1]

Originally Posted by MidnightSun

1). You have the auto-dimming setting on. You can go to Power Manager and turn off the Dim Display setting under Idle Timers (Advanced mode).

Thanks midnight! Yes the screen was set to dim brightness to 2 after 2 mins of inactivity (on battery mode) so now changed it to 7.

[psychopomp1]

Hi
I'm afraid i'm still getting this problem. What happens frequently is that whilst using my notebook, the display turns dim and then gradually returns to normal brightness. Why is this happening?