I just got one interesting scenario:

0) Log-in to unity 2d via lightdm.
1) Start virtualbox (with WinXP+windowsupdate) → Heavy system load
After starting it, unity made the impression to be crashed, so
2) Enter CTRL+ALT+F1, DISPLAY=:0; export DISPLAY; unity --replace, ALT+F7
3) In rare cases, pressed letters showed up repeatedly.
4) After stopping virtualbox, I recognized that there were two instances of 
unity running. I'm not sure if I've been starting unity 3d in step 2.

I assume one of those two cases occured:
1) In step 2, I've unindendendly started unity 3d. So there's nothing to learn 
out of this comment.
2) I've not started unity 3d in step 2. That would mean the repeation of keys 
also appears in environments other than unity 3d. The conclusion would be: 
unity 3d puts my system under heavy load. This bug might then be converted to a 
wish to improve unity's performance. IMHO, a 2x1,8 MHz system with 2 GB of RAM 
should be enough to enter text without repeations or lags (they do not appear 
in unity 2d under normal load).

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https://bugs.launchpad.net/bugs/873053

Title:
  unity 3d: issues with usb keyboard

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