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Date: Tue, 17 Aug 2010 13:19:05 +0200
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Subject: Re: [gentoo-user] Still Struggling With Wireless
From: Elmar Hinz <oss.elmar@googlemail.com>
To: gentoo-user@lists.gentoo.org
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> When I got this to work, I thought I was home free despite the "kludgy"
> way of getting wireless working. =A0However, I rebooted and now, when I
> type iwlist wlan0 scan I get told that scanning is not supported. =A0Yes,
> I have iwl3945-ucode installed and yes, it was recompiled after the
> kernel was rebuilt.
>

Another hint:

emerge rfkill

rfkill list

It will show you some state of the module, if the module is "hard blocked".
That can be a reason for scanning not supported, a hint, that the card is
not turned on at all.