[Bug 266888] hint.* don't survive suspend/resume

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266888

            Bug ID: 266888
           Summary: hint.* don't survive suspend/resume
           Product: Base System
           Version: 13.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: ltning-freebsd@anduin.net

Hi,

Have applied the patch by Tom Jones from #253288 which works wonders, but
during A/B testing with and without the patch, I stumbled across something
potentially significant: Hints given via the boot loader prompt - and
presumably via loader.conf - do not survive a suspend/resume cycle.

In this case, the hint to disable hwpstate_intel was set during initial boot,
and the system was stable. After a suspend/resume had set my heart racing (it
actually worked!), the system wedged shortly after, as if the aforementioned
hint had not been set. I'm guessing the hwpstate_intel driver attached itself
upon resume because the hint was purged from memory, leading to the wedging
problem resurfacing.

I assume this should be easy to test/verify for anyone slightly more qualified
than me, but my suspicion is that this will affect a significant number of
scenarios where hints (and possibly other loader.conf settings) could be lost.

/Eirik

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