I am so sorry. While trying to add acpi=off to kernel boot parameters I have 
found the options "i8042.nomux i8042.reset" which I have added some time ago to 
reduce i8042 interrupts for optimizing sleep times with powertop. After 
removing them the problem seems to be gone.
Many thanks for support.

** Changed in: linux-source-2.6.22 (Ubuntu)
       Status: Incomplete => Invalid

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[Gutsy] after shutdown and power on keyboard and mouse doesn't work
https://bugs.launchpad.net/bugs/140791
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