source : http://support.lenovo.com/en_US/downloads/detail.page?DocID=HT004603
Unknown Devices after installing Windows Vista / 7 – ThinkPad SL300, SL400, SL500, R400, R500, T400, T500, W500, W700, W700ds, X200, X200s, X200 Tablet and X301
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List of devices which are unsupported and deprecated