zkus místo ndiswrapperu použít jaderný modul (tvá karta má Marvell čipset):

4.18 Marvel Libertas (802.11g)
Driver status : Stable
Driver name : libertas.o
Version : -
Where : Linux kernel (2.6.22)
Maintainers : Dan Williams <dcbw@redhat.com>
Mailing list : http://lists.infradead.org/mailman/listinfo/liberta s-dev
Documentation : Readme files
Configuration : Wireless Extensions and debugfs
Statistics : Wireless Extensions
Modes : Managed, Ad-Hoc, Mesh
Security : WEP, 802.1x, WPA
Scanning : Wireless Extensions
Monitor : Yes
Multi-devices : ?
Interoperability : 802.11b and 802.11g
Other features : Firmware loading via HotPlug, 802.11e (QoS)
Non implemented : -
Bugs : ?
License : GPL
Vendor web page : http://www.marvell.com/

edit: popis modulu libertas a podporovaných typů čipsetů zde: http://linuxwireless.org/en/users/Drivers/libertas