The solution turned out to be simple: upgrade the kernel. I'd have thought 2.2.1 would have been sufficient, but upgrading to 2.2.9 made everything just work.
Thanks to all who replied, especially Graziano, who came up with the right answer.
The solution turned out to be simple: upgrade the kernel. I'd have thought 2.2.1 would have been sufficient, but upgrading to 2.2.9 made everything just work.
Thanks to all who replied, especially Graziano, who came up with the right answer.