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Date:      Mon, 13 Mar 2017 18:49:49 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-acpi@FreeBSD.org
Subject:   [Bug 217247] [acpi] r265474 makes 11.0R unusable with Atom 330
Message-ID:  <bug-217247-13733-38dO6F54bC@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-217247-13733@https.bugs.freebsd.org/bugzilla/>
References:  <bug-217247-13733@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D217247

--- Comment #14 from St=C3=A9phane Lesimple <stephane_freebsd@lesimple.fr> =
---
Some new data points:

The oldest version I could try, 8.0-RELEASE, behaves the same with C2 as in=
 any
more recent version (up to HEAD). This problem was hidden before due to the
cx_lowest default always being C1 up to 11.0R.

I also noticed that when C2 is set as cx_lowest, C1 is not used at all. Ano=
ther
interesting behavior is that the cx_usage_counters increases 10 times faster
with C2 than with C1.
It might also be interesting to note that C3 is ignored even if advertised =
as
supported (which is probably irrelevant to this bug).

# sysctl dev.cpu.0.cx_lowest=3DC1 ; sleep 10 ; sysctl dev.cpu.0.cx_usage_co=
unters
dev.cpu.0.cx_lowest: C1 -> C1
dev.cpu.0.cx_usage_counters: 1192 0 0

# sysctl dev.cpu.0.cx_lowest=3DC2 ; sleep 10 ; sysctl dev.cpu.0.cx_usage_co=
unters
dev.cpu.0.cx_lowest: C1 -> C2
dev.cpu.0.cx_usage_counters: 0 11122 0

# sysctl dev.cpu.0.cx_lowest=3DC3 ; sleep 10 ; sysctl dev.cpu.0.cx_usage_co=
unters
dev.cpu.0.cx_lowest: C2 -> C3
dev.cpu.0.cx_usage_counters: 0 11048 0

--=20
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