Airplane power mode

I have a T420s that will not accept power from any of the aircraft in seat power outlets. The outlets are getting power (light is on), but as soon as I plug in, the light goes out and the computer shows the battery icon....no power coming to the computer. I finally decided to see if anyone else was experiencing this problem. One thread suggested that an update of the power management software would fix the problem, in particular I would be able to select airplane power mode under the Global Power Settings. However, after the update, there is no box to check for airplane power mode.  Any recommendations?  Does the BIOS also need to be updated? Any ideas for how to get around this problem of no power on the plane?  The charger only delivers 65w.

afternoon...
along with Power Manager, do you have the latest Power Management driver installed?
T420s driver matrix: http://support.lenovo.com/en_US/research/hints-or-tips/detail.page?&DocID=HT063249
PM driver: http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS014939 for WinXP-Win7
or: http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS031949 for Win8.
hth.
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