you can also run a driver detective and let it try to find a suitable one... http://www.update-your-drivers...13&OVKWID=57581309513
it's always a pita when mfr's dont provide backwards compatibility.. it seems though from your phone conversation, if lenova has to develop one, then they may have something going on with their config that doesn't allow a standard driver to be used. you never know though, could be they just haven't added it or that was just an easy answer the phone rep could can answer as to why it's not there...
check the site again. you didn't list your specific model, so I coulldn't drill down further than T400 http://www-307.ibm.com/pc/supp...gPage.vm&validate=true
*Q6600@3330mhz 1.35v - True120 | Abit IP35pro | 2x2GB Gskil | 2 x EVGA GTS 250- shader 1890 | Corsair HX520 | OCZ Vertex 60GB/Seagate 7200.11 500GB
*x4 810@3250mhz 1.32v - Xigmatek S1283 | MSI K9A2 CF-F 790X | 2x1GB Kingston HyperX | 2 x MSI GTS 250- shader 1890 | Antec EW 500
*Q6600@3330mhz 1.36v - Scythe Mugen | Gigabyte GA-P35-DS3L | 2x1GB Ballistx | XFX GTX 260 (192) shader 1512 | OCZ Stealth 500w