New information:
About 10% of the time suspend resumes to a blank screen with blinking cursur 
that does not respond.
The mouse cursur moves but does not affect anything.
Reboot with power button is the only solution.
About 1% of the time the cursur doesn't blink.

About 5% of the time the above mentioned ACPI and PNP0C0D:00 errors appear once 
or four or five times (for five to ten seconds) and then the computer resumes 
from suspend normally. It accepts the password and everything is fine.
Just once the password field would not accept the cursur and therefore the 
password. Reboot was the only solution.

About 1% of the time the computer resumes to the blank screen with
blinking cursur for a second or two and then resumes normally.

The rest of the time it resumes directly to the log on screen and
functions normally.

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https://bugs.launchpad.net/bugs/1036456

Title:
  BUG: soft lockup - CPU#0 stuck for 22s!

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