Restores lost states after wakeup from sleep

[aluveitie]

@trulyspinach Not tested yet - can I ask you for a review before I try to run this?

[aluveitie]

@trulyspinach I've tested and verified it. This properly restores the lost Pstate and CPB settings after wakeup.

[aluveitie]

@trulyspinach I've updated the pull request. I've been experiencing complete freezes about 30mins after waking up from sleep forcing to power off and restart the machine. With the last commit I could no longer reproduce any freezes after the last couple of sleep cycles.

[trulyspinach]

Thanks a lot :). Was the freeze cause by MPERF-APERF being zero? I believe it's very unlikely for that to happen. You can view to panic log for the freeze in system log, they are all recorded.

[aluveitie]

I searched for logs, but could not find any.
I'm not completely sure since I could not reproduce it anymore (had a log there if MPERF-APERF being zero). But I guess guarding the division might still be good to have.

[trulyspinach]

Yes, of course, It should definitely present as once happen it will crash the whole system. I will look in to this more when I have more time available :)