Booting with mem=1000m (with mem=1G it caused me a kernel panic saying initrd extends beyond end of memory) indeed fixes this problem. Sorry if this is a duplicate, I have read other bug reports about bcm43xx issues, but they seemed to have been closed or to be related to other platforms (i386, ppc). Btw, I have moved to edgy, and with kernel 2.6.17-6 I have built from source with CONFIG_IOMMU_DEBUG=y and CONFIG_IOMMU_LEAK=y the problem is also fixed.
-- bcm43xx driver :kernel panic when trying to set some wireless parameters (iwconfig) https://launchpad.net/bugs/54780 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs