Date: Fri, 28 Nov 2008 00:58:16 +0100 From: "Paul B. Mahol" <onemda@gmail.com> To: martinko <gamato@users.sf.net> Cc: freebsd-acpi@freebsd.org, freebsd-mobile@freebsd.org Subject: Re: Is the C3 possible with SMP? Message-ID: <3a142e750811271558r73727d81nb7dc7184627b54d3@mail.gmail.com> In-Reply-To: <ggn74m$8ui$1@ger.gmane.org> References: <20081121195714.CEE4B45010@ptavv.es.net> <20081122113015.B70117@sola.nimnet.asn.au> <ggn74m$8ui$1@ger.gmane.org>
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On 11/27/08, martinko <gamato@users.sf.net> wrote:
> Ian Smith wrote:
>> On Fri, 21 Nov 2008, Kevin Oberman wrote:
>> > > From: martinko <gamato@users.sf.net>
>> > >
> [...]
>> > >
>> > > Hi,
>> > >
>> > > My laptop reports C1 state only:
>> > >
>> > > $ sysctl -a | grep cx_
>> > > hw.acpi.cpu.cx_lowest: C1
>> > > dev.cpu.0.cx_supported: C1/1
>> > > dev.cpu.0.cx_lowest: C1
>> > > dev.cpu.0.cx_usage: 100.00%
>> > >
>> > > But this is Pentium-M and I remember it could use C2 and C3 back with
>>
>> > > 5.x kernel and I'm sure I had USB as I have now.
>> > >
>> > > Do you have any idea why I don't have C2/C3 states available anymore
>> ??
>> >
>> > Under 7-Stable, my Pentium-M system (ThinkPad T43) shows C1, C2, and
>> > C3. Of course, it's not an SMP.
>> > dev.cpu.0.cx_supported: C1/1 C2/1 C3/85
>> > dev.cpu.0.cx_lowest: C1
>> > dev.cpu.0.cx_usage: 100.00% 0.00% 0.00%
>> >
>> > cx_supported has nothing to do with the value of cx_lowest. It should
>> > simply be what the CPU reports back vi ACPI as to the C states
>> supported
>> > on the platform.
>>
>> Well, except that cx_supported shows the possible values for cx_lowest;
>> ie you can only select a value for cx_lowest that's in cx_supported ..
>> so it does seem odd that martinko's cx_supported has been limited to C1?
>>
>> Whether the system ever actually uses the cx_lowest value you select,
>> other than C1, is another matter of course. My T23 (P3-M, 7.0-R) allows
>> selection of C3, but only ever uses it if the machine was booted up on
>> battery(!) but that might be a BIOS/EC bug that upgrading these may fix.
>>
>> cheers, Ian
>>
>
> Well, booting with or without battery does make a difference, strangely:
>
> $ sysctl dev.cpu
> dev.cpu.0.%desc: ACPI CPU
> dev.cpu.0.%driver: cpu
> dev.cpu.0.%location: handle=\_PR_.CPU1
> dev.cpu.0.%pnpinfo: _HID=none _UID=0
> dev.cpu.0.%parent: acpi0
> dev.cpu.0.freq: 525
> dev.cpu.0.freq_levels: 2000/-1 1800/-1 1600/-1 1400/-1 1225/-1 1200/-1
> 1050/-1 1
> 000/-1 875/-1 800/-1 700/-1 600/-1 525/-1 450/-1 375/-1 300/-1 225/-1
> 150/-1 75/
> -1
> dev.cpu.0.cx_supported: C1/1 C2/1 C3/2
> dev.cpu.0.cx_lowest: C3
> dev.cpu.0.cx_usage: 100.00% 0.00% 0.00%
>
> This was suggested to me by Henry Hu:
>
> Henry Hu wrote:
> > You may try to boot with battery.
> > If I boot with AC, there are only C1 and C2. But if I boot with
> > battery, there is C3.
> > I found that the line to recheck cx states has been commented in the
> > source code. So cx states keep the same since system startup.
> >
> > Cheers,
> >
> > Henry
>
> Cx states other than C1 are never used, unfortunately. Both C2 and C3
> were used back with 5.something (I started with 5.3). I guess USB might
> be the culprit here. Anyway, it behaves strangely, at best. :(
>
> Cheers,
>
> Martin
>
> PS: Also, AFAIR C3 was not 2 but something like 100 back in times of 5.x
> when it worked on this laptop correctly.
It works for me: [ignoring fact that C3 appears only if laptop is
disconneted from AC]
Looks like I'm lucky ...
CPU: Intel(R) Core(TM)2 CPU T5500 @ 1.66GHz (1662.51-MHz 686-class CPU
dev.cpu.0.%desc: ACPI CPU
dev.cpu.0.%driver: cpu
dev.cpu.0.%location: handle=\_PR_.CPU0
dev.cpu.0.%pnpinfo: _HID=none _UID=0
dev.cpu.0.%parent: acpi0
dev.cpu.0.freq: 125
dev.cpu.0.freq_levels: 1667/31000 1458/27125 1333/22000 1166/19250
1000/13000 875/11375 750/9750 625/8125 500/6500 375/4875 250/3250
125/1625
dev.cpu.0.cx_supported: C1/1 C2/1 C3/57
dev.cpu.0.cx_lowest: C3
dev.cpu.0.cx_usage: 0.00% 4.59% 95.40%
dev.cpu.1.%desc: ACPI CPU
dev.cpu.1.%driver: cpu
dev.cpu.1.%location: handle=\_PR_.CPU1
dev.cpu.1.%pnpinfo: _HID=none _UID=0
dev.cpu.1.%parent: acpi0
dev.cpu.1.cx_supported: C1/1 C2/1 C3/57
dev.cpu.1.cx_lowest: C3
dev.cpu.1.cx_usage: 0.00% 3.61% 96.38%
Design capacity: 3365 mAh
Last full capacity: 3365 mAh
Technology: secondary (rechargeable)
Design voltage: 10800 mV
Capacity (warn): 169 mAh
Capacity (low): 34 mAh
Low/warn granularity: 100 mAh
Warn/full granularity: 100 mAh
Model number: Primary
Serial number: 03400 2007/03/19
Type: LIon
OEM info: Hewlett-Packard
State: discharging
Remaining capacity: 92%
Remaining time: 2:12
Present rate: 15573 mA
Voltage: 11708 mV
It is interesting that when machine is almost completly idle
typing inside syscons is very slooow - I need to move mouse
all the time to speed up it (guess syscons is very slow).
But just having mplayer playing music in background
will improve interactivity a lot, note this doesnt happen inside X11.
It doesnt happen if one of CPU have cx_lowest set to C2.
This is very evident if I use powerd -b minimum.
PS:
I tested it with usb2_{core,controller_(ehci,uhci)}
--
Paul
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