let me clarify the situation: I, personaly, don't need help. I compile my own kernels, and I use the default kernel only once, on the first boot. But if somebody installs ubuntu with the default kernel, it will not boot, it will just permanently hang. You cannot put wbsd.ko into /etc/modprobe.d/blacklist, or just delete it from /lib/modules, because the machine will not boot! And one has to have some knowledge to be able to track the problem down to wbsd.ko, and either use a live CD to tweak /etc/modprobe.d/blacklist or /lib/modules/*, or, as you say, feed "iommu=off" to the kernel at the boot time (not sure it will work). An average user simply doesn't have that knowledge.
the default kernel has to boot out of the box, with no tweaks. -- wbsd.ko hangs amd64 kernel due to wrong DMA memory allocation https://launchpad.net/bugs/75084 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
