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How to enable usb2 and usb3 ports on a gigabyte AMD motherboard what runs a steamos
16.01.18
a gigabyte AMD cpu motherboard like 990FXA-UD3 did not enable usb3 with usb2 on steamos or debian jessie 1. disable iommu in the bios disable XHCI in the bios disable EHCI handoff in the bios 2. boot with iommu=soft 3. for permanently grub2 boot iommu=soft edit the grub2 file: a. emacs /etc/default/grub b. GRUB_CMDLINE_LINUX="iommu=soft" c. update-grub
https://ubuntuforums.org/showthread.php?t=2188370
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