Comment 23 for bug 1353050

Finally!!! found a solution here:

http://ubuntuforums.org/showthread.php?t=2111223&page=4

Must edit the GRUB file then reboot and disable the "IOMMU" setting in BIOS for the VIA VL805 to work with
64b Kernel

"Quote"
Here is my updated fix

First enable iommu in the uefi by restarting your computer and pressing delete to enter the uefi

plug your usb mouse, keyboard and thumbdrive in usb 2 ports.

save and exit the uefi

Then In Ubuntu:

press Ctrl+Alt+T to open up a terminal

run the following command: sudo gedit /etc/default/grub

Edit the empty quotes in this line to read: GRUB_CMDLINE_LINUX="iommu=soft"

save changes to grub and exit gedit and the terminal

Open up a new terminal with ctrl+alt+t

run the following command: sudo update-grub

then exit the terminal using this command: exit

Restart your computer press delete to get back into the uefi

Disable iommu in bios, load optimized defaults and restart.

usb, 2.0 usb 3.0 and networking all work now in Ubuntu, and disabling iommu in bios helps prevent windows freezes that was occurring if you are running a dual boot environment.

If the above post helps anyone I am happy.
Last edited by ozcyto; May 29th, 2014 at 12:25 AM.