Date: Sat, 28 Jun 2008 18:48:19 -0700 From: David Wolfskill <david@catwhisker.org> To: Kevin Oberman <oberman@es.net> Cc: freebsd-acpi@freebsd.org Subject: Re: How/why would dev.cpu.0.freq_levels change??!? Message-ID: <20080629014819.GR70792@bunrab.catwhisker.org> In-Reply-To: <20080629003216.3AA074500E@ptavv.es.net> References: <200806281738.40672.jhb@freebsd.org> <20080629003216.3AA074500E@ptavv.es.net>
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--EVTdUHOLdMfS4dQd Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Jun 28, 2008 at 05:32:16PM -0700, Kevin Oberman wrote: > > From: John Baldwin <jhb@freebsd.org> > > ... > > Looks like it lowered the temperature. Your BIOS might have decided to= change=20 > > the levels to force the CPU to throttle down to cool the system. I suppose. :-( But as I noted, it often runs for extended periods at around 85C, so the rationale (if any) for such a maneuver escapes me. > Any chance you moved to battery at any time? My ThinkPad BIOS drops my > CPU's top speed from 2G to 800M when I go onto battery. In this case, I definitely did not, and I was on AC at the time I reported the issue. I've noted recurrences since -- one of which was particularly ntable because dev.cpu.0.freq_levels reported that the fastest available spedd was 1200 MHz, while dev.cpu.0.freq reported that the machine was running at 2400 MHz. Through some experimentation, it appears that I can reduce the probability of the event -- and possibly avoid it altogether (I can't be sure yet) by killing off powerd. (I apologize for failing to mention that I run it, using default settings.) Also, I've only seen it while running RELENG_6 -- not RELENG_7 or HEAD. Then again, I generally only run RELENG_7 or HEAD enough to build them. Thanks for the responses so far. Peace, david --=20 David H. Wolfskill david@catwhisker.org I submit that "conspiracy" would be an appropriate collective noun for cats. See http://www.catwhisker.org/~david/publickey.gpg for my public key. --EVTdUHOLdMfS4dQd Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (FreeBSD) iEYEARECAAYFAkhm6d8ACgkQmprOCmdXAD2NngCePCeI3UmjU7DU/WZPXllRMaU3 D6sAmwdsKA8+ca5NKl0wVbjvWpewIFws =Zkg2 -----END PGP SIGNATURE----- --EVTdUHOLdMfS4dQd--
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