Comment 9 for bug 1790602

Since we are at kernel level 4.18.0.8.9 in cosmic that incl. the fix:
$ git log --oneline | grep "cpuidle: powernv: Fix promotion from snooze if next state disabled"
0a4ec6a cpuidle: powernv: Fix promotion from snooze if next state disabled
$ git tag --contains 0a4ec6a
Ubuntu-4.18.0-7.8
Ubuntu-4.18.0-8.9
Ubuntu-4.18.0-9.10
v4.18
This can be marked as Fix Released for cosmic, too.