Comment 2 for bug 123920

Can you include the output of the command lsusb on a terminal.

Try the following:
1. Direct after gnome login open a terminal and enter the following command:
 $ cp /var/log/Xorg.0.log ~/Xorg.0.log
 $ cp /var/log/dmesg ~/dmesg_boot
2. Wait until your mouse and keyboard stop working.
3. Open a terminal by pressing Ctrl-Alt-F1.
4. Enter the following commands:
 $ cp /var/log/Xorg.0.log ~/Xorg.0.log_tmp
 $ diff -ns ~/Xorg.0.log ~/Xorg.0.log_tmp > ~/Xorg.0.log_diff-ns
 $ dmesg > ~/dmesg
 $ diff -ns ~/dmesg_boot ~/dmesg > ~/dmesg_diff-ns
5. Attach Xorg.0.log, Xorg.0.log_diff-ns, dmesg_boot and dmesg_diff-ns to this bug report.