Ubuntu

Gigabyte 990FX Gaming Rev1

Asked by br116

During boot of Ubuntu 14.04 LTS USB keyboard and mouse connected to the USB "DAC" port work perfectly in BIOS screen.
Once boot is done the connection is lost and USB keyboard and mouse no longer works.
Same things happens if I switch the hardware to the USB 3.1 port.
Where/how do I obtain detail "debugging" data to submit here?
Or better yet, does anyone know if this is a known issue (lack of drivers)?

Thank you.

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br116 (br116) said : 		#1

The issue has to do with IOMMU -- Input Output Memory Management Unit. We need to make sure that the OS controls it rather than the mobo firmware.

open a terminal and issue the following command:

Code:

gksudo gedit /etc/default/grub

Input your password at the prompt.

Find the line that says GRUB_CMDLINE_LINUX="" and change it to GRUB_CMDLINE_LINUX="iommu=soft"

I also change the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash iommu=soft"

Save the file.

Now you need to update GRUB to use the new settings:

Code:

sudo update-grub

Reboot. You may or may not have to disable IOMMU in your BIOS/UEFI if you still have problems when you reboot.