I think I have found a way to reproduce this bug:

If I run the script http://launchpadlibrarian.net/25972602/kb.sh, I
attached a few seconds ago, as root and press some keys during "sleep 5"
than the keyboard will behave incorrect (in the same way as described in
this bug report).

Here are the related dmesg lines:
[11895.609042] serio: i8042 KBD port at 0x60,0x64 irq 1
[11895.609067] serio: i8042 AUX port at 0x60,0x64 irq 12
[11895.656337] input: AT Raw Set 2 keyboard as 
/devices/platform/i8042/serio4/input/input10
[11896.286737] Synaptics Touchpad, model: 1, fw: 6.3, id: 0x180b1, caps: 
0xa04713/0x200000
[11896.324194] input: SynPS/2 Synaptics TouchPad as 
/devices/platform/i8042/serio5/input/input11

-- 
extended ascii characters not displayed on cold boots
https://bugs.launchpad.net/bugs/285908
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