08-29-2011 12:48 PM - edited 08-29-2011 12:54 PM
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?
08-29-2011 04:48 PM
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
08-30-2011 11:47 AM