16.04 - AMD System fresh install , Only USB 3 working (IOMMU?) - Ask Ubuntu


i fresh installed ubuntu 16.04 on amd machine

  • cpu: amd fx 8350
  • mobo: gigabyte 970a-ud3p (am3+)

problem when os first booted both kb , mouse not working , until switched usb3 ports..

i read other kinda similar issues had iommu , people activating in bios , when did went wrong , , usb3 ports not(!) working.

i rolled initial setup , came here help..

any ideas?

i getting errors on fresh install of ubuntu 16.04 on pc

  • cpu: fx 6300
  • mobo: ga 970a-ds3p

errors this:

usb 5-1: device descriptor read/64, error -32 usb 5-1: device descriptor read/64, error -110 usb 5-1: device not accepting address 4, error -32 usb 5-1: device not accepting address 4, error -110

then tried this.

first, enable iommu in bios restarting computer , pressing delete enter bios (3.0 ports won't work after step, don't worry, soon)

plug usb mouse , keyboard in usb 2.0 ports.

save , exit bios

then in ubuntu:

press ctrl+alt+t open terminal

run following command: 

sudo nano /etc/default/grub

only edit empty quotes in line read: grub_cmdline_linux="iommu=soft"

save changes grub , exit

open new terminal ctrl+alt+t,

run following command: sudo update-grub

exit terminal

restart computer, press delete bios

disable iommu, load optimized defaults , restart.

it's done!

usb 2.0 , usb 3.0 should work in ubuntu, , disabling iommu in bios may speed boot.


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