I tested modules as suggested:

# uname -srv
Linux 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011
# lspci -k |grep -A 3 Network
02:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 
01)
        Subsystem: Hewlett-Packard Company BCM4312 802.11b/g Wireless LAN 
Controller
        Kernel driver in use: b43-pci-bridge
        Kernel modules: ssb

# uname -srv
Linux 2.6.38-02063802-generic #201103281246 SMP Mon Mar 28 14:09:46 UTC 2011
root@varis:~# lspci -k|grep -A 3 Network
02:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 
01)
        Subsystem: Hewlett-Packard Company BCM4312 802.11b/g Wireless LAN 
Controller
        Kernel driver in use: b43-pci-bridge
        Kernel modules: ssb

No difference whatsoever.
I also compared lsmod output: no difference there either
(apart from module sizes, of course).
Yet the former freezes and the latter does not.

The 2.6.39-0 kernel does indeed work, so we have a solution,
but the cause of the problem remains a mystery.

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https://bugs.launchpad.net/bugs/772923

Title:
  BCM4312 on HP Mini 2133 freezes with Natty

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