The key to this issue may be given by the following clue from
/var/log/kern.log:
ACPI Error (evxfevnt-0383): Could not disable RealTimeClock events [20080609]
ACPI: RTC can wake from S4
Which, if it is indicating the root cause, indicates a 'bad' ACPI DSDT.
If you're experiencing this issue with Hardy, Intrepid or Jaunty could
you please search the logs after recovering from this issue and report
the results:
grep '\(ACPI Error\|RealTimeClock\|RTC can wake\)'
/var/log/kern.log{,.0} | tee /tmp/lp63967.log
If that shows results attach /tmp/lp63967.log to this bug report.
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machine does not wake up after suspend
https://bugs.launchpad.net/bugs/63967
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