Impossible to turn Inspirion 1545 into Access Point?

My wireless card worked out of the box, but now I want to turn the maschine into an access point so I followed these guides

Unfortunately, iwconfig eth1 mode master returns Error for wireless request "Set Mode" (8B06) : SET failed on device eth1 ; Invalid argument. and according to iw list supported interface modes are IBSS and managed.

Strangely using Windows' hosted network works fine.

My Network Controller is Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01).

With 802.11, one can alternatively set up an ad-hoc network of client

• installing the open source driver (wireless.kernel.org/en/users/Drivers/b43#Ubuntu.2FDebian) helped now iw list shows AP – user28061 Jun 17 '13 at 17:33