Walter Goldens [off-list ref] writes:

Hi Paul,

Your device has ZyDAS zd1211b chip which is covered by the zd1211rw driver. Recently AP support has been implemented for this module. You'll likely need compa t-wireless to enable it on your system.

Walter

Hallo Walter.

Thank YOu for the answer.

I didn't know about compat-wireless package, thus that's why I upgraded
by ubuntu 10.04 to ubuntu 11.04, then gotten newest kernel 2.6.39 week
ago.

then I did: 
$ iw list
Wiphy phy0
....
....
	Supported interface modes:
		 * IBSS
		 * managed
		 * AP           !!!! YES, YES
		 * AP/VLAN
		 * monitor
		 * mesh point

BUT:(((((:

$ sudo iwconfig wlan0 mode master
Error for wireless request "Set Mode" (8B06) :
    SET failed on device wlan0 ; Invalid argument.

I was a little bit disappointed, that's why I decided to ask You.

What am I doing wrong?

best regards,
Paul