I actually had this problem.. Apparantly you have to use an older hotkey or power mangaement driver. I just reformatted again, but I can't find those drivers that i previously used that worked...
edit: Nevermind the install manager was comparing to the current version that i had installed.. the 50 is infact newer.Although the linked drivers are for some reason newer(version 6 vs version 5)
"6wvu17ww.exe" than lenovo's current driver listing of "6wvu50ww.exe"
also evident by the new style of display with black borders and a continuous progress bar rather than individual block levels
I still can't get the brightness now
EDIT:WAIT WAIT WAIt now i remember why it was so confusing... It wasn't so much the version of lenovo's "hotkey features integration" causing the display brightness level to not show up but it's that you need an older version of INTEL's display drivers.. or maybe just not use the window 7 automatically downloaded ones
either way i know for surehttp://download.lenovo.com/ibmdl/pub/pc ... d808ww.exe
maybe newer intel drivers work if downloaded from lenovo's site but not sure..