Comment 6 for bug 287576

I tried to recompile the kernel and remove the ubuntu modification from drivers/usb/core/hub.c (see attached patch), and the usb hubs are working back. I guess the bug is somewhere in this modification.

How I did :

apt-get source linux-image-2.6.24-21-generic
patch -p1 -R < hub.patch
cd linux-2.6.24.2/
cp /boot/config-2.6.24-21-generic .config
make deb-pkg
dpkg -i ../linux-2.6.24.3_2.6.24.3_i386.deb
mkinitramfs -o /boot/initrd.img-2.6.24.3
edit /boot/grub/menu.lst

reboot on this kernel.