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lax20531
SCSI Port
Posts: 63
Registered: ‎08-11-2010
Location: US
Views: 827
Message 1 of 3

T420s: Is brightness controlled by an ambient sensor?

Immediately upon entering Windows (after either a cold boot or resuming from Sleep), I notice the display achieves a high degree of brightness for about 1 second, then dims somewhat despite the brightness being set to max.  This occurs with AC power and a full battery.  It appears the initial brightness is more similar to my T410s.  Does the T420s have an ambient light sensor that would cause something like this to occur?  If so, how can I disable it so I can manage it myself? 

ColinATL
Fanfold Paper
Posts: 3
Registered: ‎08-28-2011
Location: Atlanta
Views: 812
Message 2 of 3

Re: T420s: Is brightness controlled by an ambient sensor?

I don't think it has a light sensor.  I would check your power manager settings and reset them to default and see if that would fix the issue.  Try to run ThinkVantage system update and update all the drivers including the optional ones

 

GO to start -> type "Think" and launch "Lenovo ThinkVantage Tools" -> Update and drivers

lax20531
SCSI Port
Posts: 63
Registered: ‎08-11-2010
Location: US
Views: 783
Message 3 of 3

Re: T420s: Is brightness controlled by an ambient sensor?

Drivers have all been updated and I reset all Power settings, but no improvement. I also turned off all settings related to Power Savings in BIOS w/no change.
Something is causing this to occur.

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