Date: Mon, 13 Mar 2006 12:46:46 -0800 From: Nate Lawson <nate@root.org> To: Kris Kennaway <kris@obsecurity.org> Cc: stable@FreeBSD.org Subject: Re: Problems with hw.acpi.cpu.cx_lowest=C2 (Re: cvs commit: src/etc/defaults rc.conf) Message-ID: <4415DA36.2000904@root.org> In-Reply-To: <20060313172457.GA96768@xor.obsecurity.org> References: <200601290551.k0T5pwEC028440@repoman.freebsd.org> <20060129060654.GA47495@xor.obsecurity.org> <20060129061300.GA47596@xor.obsecurity.org> <43DC5E0B.40003@root.org> <20060129063007.GA47800@xor.obsecurity.org> <20060313083954.GA46731@xor.obsecurity.org> <4415A5E7.8000801@root.org> <20060313172457.GA96768@xor.obsecurity.org>
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Kris Kennaway wrote: > On Mon, Mar 13, 2006 at 09:03:35AM -0800, Nate Lawson wrote: > >>> I finally managed to test this in RELENG_6. The system performance is >>> not obviously bad, but sound playback is distorted (e.g. the 'bell' in >>> KDE is much higher pitched than it should be, and on the console it is >>> low pitched and lasting about 3 seconds). Nothing is logged on >>> console. >>> >>> There may be other problems that I didn't notice right away, but the >>> sound problems were enough to make me turn it off again. >> Are you sure that's the cause? (Does setting cx_lowest to C1 fix it?) > > Absolutely sure: the system worked at C1 after boot, then I set it to > C2, observed that beeping was broken, then set it back to C1 and > observed that it worked again. Ok, good to know. This looks like a different failure mode where occasionally the system is waking up from the idle too often, but not enough to affect system performance. >> Can you send the output of sysctl hw.acpi so we can see how often each >> cx type is being run? > > hw.acpi.cpu.cx_supported: C1/0 C2/1 > hw.acpi.cpu.cx_lowest: C1 > hw.acpi.cpu.cx_usage: 100.00% 0.00% I'd like to see it after you've set it to C2 for a few minutes. I'm looking to see what happens with cx_usage. -- Nate
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