Having the same issue with the random characters on 14.04.3 and 15.10.
It stops for several minutes after pressing the ESC key.
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Same problem with a wireless Genius on Ubuntu 13.10 but not with a
Genius wired
Wireless (mouse settings missing)
$ xinput --list
⎡ Virtual core pointer id=2[master pointer (3)]
⎜ ↳ Virtual core XTEST pointerid=4[slave pointer (2)]
⎜ ↳ SynPS