T420S display switch to 50 Hz battery power

I just got my T420s, and I love it, except for a boredom that I can't mitigate. No matter what options I choose, whenever I draw from the power adapter, the display of flickers for a second, back to the top, and of course, it went to 50 Hz. When I plug the power back in, it flashes again and back to 60 Hz.

I tried everything I can think of. I did the graphics properties and made sure to turn off all the power saving features when the battery is selected. I tried the new 60 Hz after setting that it has introduced to 50 Hz then on the battery. This work until the power is reconnected and then removed, at which point, she goes back to 50 Hz.

This happens as well with the display of Lenovo and Intel a genereic driver. It happens with the preloaded image that comes with the laptop and with a clean install. I don't know if it's a bug with the drivers, or Power Manager software. Does anyone else have this problem?

Thanks in advance for your help.


Tags: ThinkPad Notebooks

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