Date: Sat, 25 Jun 2011 18:47:15 +0300 From: Vitaly Magerya <vmagerya@gmail.com> To: Andriy Gapon <avg@freebsd.org> Cc: freebsd-acpi@freebsd.org Subject: Re: (Missing) power states of an Atom N455-based netbook Message-ID: <BANLkTi=dyNx=TjyEqYMhSkRtddjVA4nAtw@mail.gmail.com> In-Reply-To: <4E05EB91.9090509@FreeBSD.org> References: <BANLkTim%2B1UwquMJ32WP8wZBGkYxPv78MLA@mail.gmail.com> <4E05EB91.9090509@FreeBSD.org>
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Andriy Gapon <avg@freebsd.org> wrote: > on 24/06/2011 22:13 Vitaly Magerya said the following: >> Right after I start the laptop I only see one supported power state: >> >> # sysctl dev.cpu.0.cx_supported >> dev.cpu.0.cx_supported: C1/1 >> >> But after 4+ minutes of uptime more power states kick in: >> >> # sysctl dev.cpu.0.cx_supported >> dev.cpu.0.cx_supported: C1/1 C2/20 C3/100 >> >> I'd like to have all Cx right after the boot. Is this possible? >> >> (The temporary solution I employ is to update hw.acpi.cpu.cx_lowest >> every time devd gets ACPI CMBAT message; this appears to happen >> right after cx_supported is updated). > > Hmm, strange... > Can you check if FreeBSD thinks that the system is on AC power until that > CMBAT message? (I see in dmesg that during that boot it detected AC as > disconnected). AC was indeed disconnected during that boot (and hw.acpi.acline was 0 as expected). If I boot with power on the problem is the same: about 4 minutes there's only C1, after that there are C1 and C2 (C3 kicks in too once I disable the power). (I boot with power cord disconnected, since LCD brightness controls on the laptop don't work with FreeBSD, so that's the only way to turn the brightness down). >> Also, when I boot the same machine under Linux (latest Ubuntu), >> powertop reports C1, C2 and C4 right away. Is it possible to get >> C4 under FreeBSD as well? > > I believe that what FreeBSD reports as C3 is the same as what Linux reports > as C4. The problem is that on Linux power consumption is 5.2W (without USB suspension or any other things powertop suggests), while on FreeBSD I'm seeing 6.8W with C3. I assumed this was due to C4/C3 difference, but maybe Linux is doing something differently. >> Other ACPI problems, which I have are: >> 1. When the power cord is plugged in, C3 state disappears. > > Does the same happen with Linux? > Many notebooks disable deep Cx states when on AC power for some reason. No. On Linux C4 is reported both with and without AC plugged in. >> 2. When I plug (or unplug) the power cord I get these two messages: >> >> ACPI Error: [\\_SB_.VDRV] Namespace lookup failure, AE_NOT_FOUND >> (20101013/psargs-464) ACPI Error: Method parse/execution failed >> >> [\\_SB_.PCI0.LPC0.H_EC._Q51] (Node 0xc42ac1e0), AE_NOT_FOUND >> (20101013/psparse-633) >> >> (This appears to be harmless). > > Not sure about these, looks like some additional/external table is not > loaded. You may check if the same happens with the latest ACPICA in FreeBSD > CURRENT. I just tried it with CURRENT snapshot from 2011-05-12; it behaves the same. (For the record, Linux reports similar messages).
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