Ubuntu sets the values of this parameter depending if you are on AC
power.

Check to make sure you have laptop mode enabled on battery power.  Then
run powertop wgile on battery power. You'll probably find that the
message will not occur any more.

-- 
powertop suggests "increase the VM dirty writeback time from 5.00 to 15 
seconds" repeatedly
https://bugs.launchpad.net/bugs/137602
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