T520 display blanks and flashes when plugging/unplugging ac power

the subject says it all.
brand new t520 with optimus (nvidia+intel) display adapter, 1920x1080 screen.
whenever i plus in or unplug power, the display blanks for about 2 seconds, then flashes back on.
the problem occurs whether the bios setting is integrated, dicrete, or optimus, and th problem occurs even if the display settings are the same in power profile for AC and battery.
is this normal? it is very BAD.
thanks in advance.
george
Solved!
Go to Solution.

hey ghoffman,
uninstall the current graphic driver that you have. let windows install its own generic drivers.
once generic driver has been installed, test again and see if the problem occurs. If it does not, continue by going to our support site via http://support.lenovo.com
download the latest graphic driver for your unit, install it and test again.
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T520 display blanks and flashes when plugging/unplugging ac power

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