Hardware support 802.11k&r

Hello,

I'm looking for hardware which supports 802.11k and 802.11r.
So far I'v tried two USB-Wifi Dongle with Realtek Chipsets (RTL8192CU 
and MT7610U). For both Realtek says 802.11k&r are supported but I 
couldn't get it work.
 From my point of view the problem with the realtek chipsets is that 
both use the old wext wifi driver and wext doesn't support 802.11k&r.

Can anyone recommend wifi hardware which supports 802.11k&r?
Has anyone experience with 802.11k&r?

Thanks,
Stefan Feirer