EDIT: I finally realized that there are two different versions of Linux listed in the Grub booting menu

  • 3.13.0-39
  • 3.13.0-32

If I pick 3.13.0-32 the keyboard and mouse will work. But if I pick 3.13.0-39 I have no mouse or keyboard.

Last week I installed Ubuntu 14.04 on a Dell Optiplex 760. The whole install worked fine and I started getting everything on the machine set up to my liking (installing chrome, email client, mapping a shared drive). I rebooted several times during this process and had no issues.

I come back to it this morning and now I cannot get any keyboard or mouse to do anything inside of Ubuntu. I have tried different keyboards/mice and different USB ports all with no effect.

While the machine is booting up it does recognize keyboard and mouse because I can use them to press F2 which will take me to the BIOS and then I can navigate around the BIOS with both mouse and keyboard. So I know all of the hardware is working fine.

Searching around online I've found a lot of stuff talking about VT-d and enabling IOMMU but I don't see any option for anything by either of those names in the BIOS and I don't know enough about either of them to even know where else to start looking.

Since I can't get keyboard or mouse working I can't run any commands to help with diagnostics.

However I am able to boot from the install CD and alter files on the hard drive. I tried adding intel_iommu=soft to the file /etc/grub.d/40_custom based on a suggestion I found while searching for this issue and device model #. That does not seem to have had any effect though to be honest I am not certain I actually put it in the right spot.

Does any one have suggestions for further diagnosing or solving this issue so that I can correctly use mouse / keyboard on my machine?


I have had same problem whit mouse, and you could try to enter in the terminal this:

 gsettings set org.settings.gnome-cursor cursor=false

and for the keyboard enter this in the terminal:

 gsettings set org.settings.gnome-keyb keyb=true

and it might work fine this way.

  • I will try it out tomorrow, thanks for the suggestion. – FoamyGuy Nov 24 '14 at 22:53
  • Did not work unfortuantely – FoamyGuy Dec 4 '14 at 18:50

There has been another new version of the kernel 3.13.0-40 which resolved the issue. Once my ubuntu updated to this new version everything went back to working correctly.

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