\HKEY_LOCAL_MACHINE
\SYSTEM
\CurrentControlSet
\Services
\i8042prt
\Parameters
'PollStatusIterations' specifies the maximum number of times to check the i8042
controller status register for interrupt verification before dismissing the
interrupt as spurious. It says some keyboards are dismissed as spurious under certain
conditions.
Changing the value from 1 to 2 sometimes cures the lockups.