I'm using Acer Aspire 5750 and Ubuntu 11.10 desktop 64bit. In my case, 'xinput test' gave me the following result. $ xinput test "AT Translated Set 2 keyboard" key release 36 key press 112 <===== I pressed the 'PgUp' key (only once) ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~^[[5~key release 112 key press 112 key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 ^[[5~key press 112 key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~^[[5~key release 112 key press 112 key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~^[[5~key release 112 key press 112 key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~^[[5~key release 112 key press 112 key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~^[[5~key release 112 key press 112 key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key release 112 key press 112 ^[[5~key press 117 <===== I pressed the 'PgDn' key ^[[6~key release 117 When I pressed the 'PgUp' key (only once not many times), it started printing "key press 112 ^[[5~key release 112 " then kept printing it even though I pressed the key only once until I pressed the 'PgDn' key which gave me "^[[5~key press 117 ^[[6~key release 117" Once it happens, I can never use the 'PgUp' key again until I reboot. 'xinput test' gives me nothing after it happens. So I can test it only once. If I want to test the 'PgUp' key again, I have to restart my PC.