acertimeline team mailing list archive

[Matthew Lai <cyberfish@xxxxxxxxxxx>]

link_power_management_policy min_power doesn't work for 3810t's either. 
The northbridge is probably too new to be supported yet.

This is what I get with my SSD 3810t at almost idle.

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        ( 2.0%)         1400 Mhz     2.4%
polling           0.0ms ( 0.0%)         1200 Mhz    97.6%
C1 mwait          0.0ms ( 0.0%)
C2 mwait          0.1ms ( 0.0%)
C6 mwait          8.3ms (98.0%)

Wakeups-from-idle per second : 120.2    interval: 10.0s
Power usage (ACPI estimate): 7.4W (9.2 hours)

Top causes for wakeups:
 41.2% ( 60.1)       <interrupt> : i915
 20.5% ( 29.9)       <interrupt> : iwlagn
  9.4% ( 13.7)     <kernel core> : hrtimer_start_range_ns 
(tick_sched_timer)
  5.5% (  8.0)        notify-osd : usb_hcd_poll_rh_status (rh_timer_func)
  4.2% (  6.1)       <interrupt> : ehci_hcd:usb2, uhci_hcd:usb5
  4.0% (  5.8)     <kernel core> : hrtimer_start (tick_sched_timer)

Power consumption fluctuates between 7 and 9.

There could be a difference between C6 and C3.

Matthew


Darrell Kavanagh wrote:
> I've made the following changes related to power management:
>
> iwconfig wlan0 power on
> and the changes suggested by powertop (except the 
> link_power_management_policy min_power, which doesn't work, I'm 
> investigating this).
>
> This brought power consumption as reported by powertop down slightly 
> to about 10.5 - 11 watts, and powertop showed thousands of wakeups per 
> second and the CPU state was always in "C1 mwait", never at "C3 mwait" 
> - both bad things according to what I read.
>
> I upgraded the bios to 1.10, and this immediately dropped the number 
> of wakeups per second to 20 or 30 when idle, and now cpu state is 
> almost always "C3 mwait". This has also dropped power consumption to 
> 9.5 to 10 watts. I'm going to experiment with more power management 
> options.
>
> I wonder if the fixed frequency of the Celeron 723, and its higher 
> power consumption compared to the Core ULV processors might make this 
> lower power computer consume more power!
>
> Darrell
>
>
> Darrell Kavanagh wrote:
> > It seems that in the UK (and Europe?) Acer offer the 3410, the 3810TZ 
> > is sold in the US, right? They do look very similar. The 3410 is not 
> > advertised as part of the Timeline range on Acer's UK website, but is 
> > by at least some retailers, and is supplied in a Timeline box. On 
> > other Acer models here in the UK, the "Z" suffix denotes a lower spec 
> > version. Confusion marketing at its worst, IMO. Even when considering 
> > the "full spec" 3810, there are models with or without the extra 
> > graphics card and bluetooth, and the retailers are very hazy about 
> > this, and rarely quote full specs. Buyer beware.
> >
> > I will try the power management suggestions and report back.
> >
> > Thanks, all
> >
> > Darrell
> >
> > elijah wrote:
> > > Matthew Lai wrote:
> > >
> > >  
> > > > The power consumption is quite high, compared to 3810T's (7W-8W 
> > > > with wireless active, and medium brightness).
> > > >     
> > >
> > >  
> > > > 1 user reported the same issue with a 3410T, with an Atheros wifi 
> > > > card, so the wireless card is probably not the culprit.
> > > >     
> > >
> > > I think the CPU on the 3410T uses more power than 3810T, and that the
> > > 3810TZ is basically the 3410T but with a 3810 label on it.
> > >
> > > It is frustratingly difficult to get any real model specs from acer.
> > >
> > > This is what I have figured out:
> > >
> > > 3410T and 3810TZ have Atheros wifi. For me, this has proven very
> > > unreliable. It cuts out frequently and I must reboot.
> > >
> > > 3810TZ has Intel Pentium SU2700 [1], it uses max 10W [2]
> > >
> > > 3410T has Intel Celeron Mobile 723, it uses max 10W [3]
> > >
> > > 3810T has Core 2 Solo SU3500 [4], it uses max 5.5W [5].
> > >
> > > According to the acer website, the timeline models have Core 2 Solo or
> > > Duo. [6]. That is a lie.
> > >
> > > Darrell Kavanagh wrote:
> > >
> > >  
> > > > Power consumption out of the box runs at around 11 or 12 Watts,
> > > >     
> > >
> > > Yeah, that is what I get for the 3810TZ. It must be the CPU that makes
> > > the difference.
> > >
> > > -elijah
> > >
> > > [1]
> > > http://reviews.cnet.com/laptops/acer-aspire-timeline-3810tz/4507-3121_7-33676738.html 
> > >
> > >
> > > [2] http://ark.intel.com/product.aspx?id=42004
> > >
> > > [3] http://ark.intel.com/Product.aspx?id=36685
> > >
> > > [4]
> > > http://reviews.cnet.com/laptops/acer-aspire-timeline-3810t/4507-3121_7-33691151.html 
> > >
> > >
> > > [5] http://ark.intel.com/Product.aspx?id=37133
> > >
> > > [6] http://www.acer.com/timeline/spec/spec.html
> > >
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