I bought an Asus X550VX laptop a few weeks ago and installed Ubuntu 16.04 alongside Windows 10 on it. For a week or so everything worked fine, until one of the USB 3.0 ports stopped working. Soon after that, the other port stopped working too. The one USB 2 port still works fine. When I connect my phone to a USB 3 port it charges, but Ubuntu doesn't recognize that a device is connected. My wireless mouse doesn't work either on those ports.

I've googled around but nothing seems to help. I've updated my bios and added a "pci=nomsi" line to grub file. Any other suggestions?

  • Try unplugging everything and trying one device / cable at a time. – WinEunuuchs2Unix Mar 7 '17 at 18:12
  • Tried that and nothing works. Not my phone, mouse or flash drive. – LaTeNaaTToRi666 Mar 7 '17 at 18:31

This ought to do it:

  1. sudo gedit /etc/default/grub
  2. Find this line: GRUB_CMDLINE_LINUX=""
  3. Change it to GRUB_CMDLINE_LINUX="iommu=soft"
  4. Save
  5. Reboot
  • Works perfectly! – Rushat Rai Jun 30 '18 at 12:01
  • Worked perfectly in Ubuntu 18.10 – Abdul Rauf Feb 22 at 16:22

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