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After installing a new graphics card (Radeon R9 380X) on my 970A-D3P board I had difficulty starting Ubuntu. The system was duel boot and I could log into windows. After resetting BIOS I could log onto Ubuntu (though still had some problems) but windows would crash. I have since done a complete reinstall attempting to make another dual boot windows 8.1 with Ubuntu. I had difficulty getting any start disk (DVD or USB) to work but finally managed to get Ubuntu installed after resetting BIOS. However, I now have no wifi (it detects networks but I cannot log on) or wired network.

Networking (wired and unwired) works in Windows.

Any suggestions?

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2 Answers 2

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On my system (mobo GA-990FXA-UD5 R5 I needed to add "iommu=soft" to the grub config file under GRUB_CMDLINE=

there is a thread floating around somewhere about it, but this should resolve the issue with USB and networking ports working oddly. For the life of me I cannot find the source post of this :/

Also, if you have issues booting a live USB, you can edit the grub entry to boot the live/installer to have iommu=soft in the grub line for the /boot/..... Info. Access the built-in grub editor by pressing e on the grub menu.

Edit: just found a source with clearer instructions: http://ubuntuforums.org/showthread.php?t=2111223&page=4

Edit2: for clarity: the AMD 900series seems to sometimes have odd behaving USB and onboard NIC issues which occur due to iommu implementation. This should resolve those issues.

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  • Hi, do you mean /etc/default/grub ?
    – ultrakow
    May 1, 2016 at 15:31
  • Yes, but for booting the install media, I needed to enable iommu=soft to properly boot the install material. The GRUB_CMDLINE is for editing the grub config you mentioned.
    – Jason Fisher
    May 1, 2016 at 15:39
  • sorry this is new to me. Do you mean the line GRUB_CMDLINE_LINUX="" should be edited to GRUB_CMDLINE_LINUX="iommu=soft"
    – ultrakow
    May 1, 2016 at 15:52
  • @ultrakow Exactly. Save it, then from cmd line, run 'sudo update-grub'
    – Jason Fisher
    May 1, 2016 at 15:54
  • Just updated the answer with a source that is similar to the one I followed. I did leave iommu enabled in BIOS though. It seems the source says to disable it after. Think that may be optional.
    – Jason Fisher
    May 1, 2016 at 15:57
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Open up your Terminal and try this : sudo apt-get install firmware-b43-installer

I had the same problem and it worked for me. Tell me if it works

Banana out

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  • Thanks for the answer. That did not work sadly. I get "unable to locate package firmware-b43-installer". I have no networking at all in Ubuntu.
    – ultrakow
    May 1, 2016 at 15:11
  • Can you try to just restart your router if you're using wifi. Just checking
    – Unfaithful Banana
    May 1, 2016 at 15:13
  • yeah I restarted. Just wont log on.
    – ultrakow
    May 1, 2016 at 15:23

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