Comment 546 for bug 88746

I have found that most of my problems have cleared up by doing the following :-

1. Adding the following to /etc/initramfs-tools/modules :-

ohci_hcd
ehci_hcd

2. Rebuilding the initramfs by running 'update-initramfs'

3. Reboot.

This (I believe) ensures the modules are loaded in the right order at boot.