I have the same problem. I tried both amd64 and i386 versions of gutsy
and used bcm43xx-fwcutter (through restricted-manager) to get the
firmware. My computer is HP notebook (dv6510ew). In fwcutter I used the
firmware from internet link that was provided. I also tried several
other firmwares (like this:
http://downloads.openwrt.org/sources/wl_apsta-3.130.20.0.o from
http://linuxwireless.org/en/users/Drivers/b43 and
bcm43xx_compwiz18.1-all.deb firmware (got it somewhere on forum)) with
the same result. I also tried extracting firmware from windows vista
driver (bcmwl6.sys) but fwcutter told me that this file doesn't contain
any firmware.

I don't know what the problem may be, because the card is listed as
compatibile with the bcm43xx driver. So maybe firmware is incorrect, if
so restricted-manager should check it and point proper firmware to me.

With these errors card is listed in iwconfig but can't find any network
(and network is present because on windows it gets detected with about
80% strenght).

This is lspci outpu about my card:

03:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11a/b/g 
[14e4:4312] (rev 02)
        Subsystem: Hewlett-Packard Company Unknown device [103c:1371]
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at b0200000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>

Dmesg output about wifi card is exactly the same as in reporter's
attachment.

** Attachment added: "lspci-v-nn"
   http://launchpadlibrarian.net/10176806/lspci-v-nn

-- 
bcm43xx cannot suspend mac
https://bugs.launchpad.net/bugs/153358
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