Same problem here on Dell Mini 9. Not really a regression for me though.
This has ALWAYS been a problem with the b43 driver. I use the bcmwl-
kernel-souce package (which installs the official STA wireless driver).

Current versions of the b43 have problems communicating with this
particular LP-PHY card via DMA. The patch to enable PIO options on boot
would be great. Patch can be found here
http://patchwork.kernel.org/patch/66372/

With this PIO can be activated with the following boot/modprobe.d command, for 
people with cards experiencing this problem.
options b43 pio=1

This command does not work at present as the patch is not applied to the
Lucid kernel.

Riz

-- 
Lucid: b43 fatal DMA error on Dell Mini 9
https://bugs.launchpad.net/bugs/502433
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