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Re: Writer Needs Help

From nospam <nospam@nospam.invalid>
Newsgroups comp.sys.mac.system
Subject Re: Writer Needs Help
Date 2014-05-18 21:07 -0400
Organization A noiseless patient Spider
Message-ID <180520142107326006%nospam@nospam.invalid> (permalink)
References (11 earlier) <llb38i$rok$1@dont-email.me> <180520141607175169%nospam@nospam.invalid> <llbfso$iet$1@dont-email.me> <180520141948039894%nospam@nospam.invalid> <llbk5u$6n6$2@dont-email.me>

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In article <llbk5u$6n6$2@dont-email.me>, Alek Trishan
<alek.trishan@gmail.com> wrote:

> >> >> >> >> Can't she run the 17" without a battery, from (as you would say)
> >> >> >> >> the mains?
> >> >> >> > 
> >> >> >> > she can but it will be roughly half its normal speed.
> >> >> >> 
> >> >> >> Really? What causes that?
> >> >> > 
> >> >> > according to apple,
> >> >> > 
> >> >> >   If the battery is removed from a MacBook or MacBook Pro, the
> >> >> >   computer will automatically reduce the processor speed. This prevents
> >> >> >   the computer from shutting down if it demands more power than the
> >> >> >   A/C  adapter alone can provide.
> >> >> 
> >> >> So the AC adapter is deliberately crippled so they can sell more
> >> >> batteries???
> >> > 
> >> > how do you get that?
> >> > 
> >> > normally, the power consumption of the macbook is well under what the
> >> > power adapter can provide. however, it's possible that a peak burst
> >> > could momentarily push it beyond, in which case the battery will fill
> >> > the void until it drops back down. it's just a brief spike.
> >> 
> >> I never heard of that with a PC. Apparently, either PC OSes operate
> >> differently or the PC laptop manufacturers supply an adapter that can
> >> handle anything thrown at it.
> > 
> > apparently they don't. 
> > 
> > <http://support.lenovo.com/en_US/detail.page?DocID=HT075965>
> >   Newer ThinkPads make use of high performance CPUs that may require
> >   more power than what the 65W adapter can provide while also
> >   supporting USB, Optical and other attached devices, especially in 
> >   docked configurations.  To prevent the potential for sudden system
> >   shut down if the power demand exceeds what the adapter can supply,
> >   the maximum clock speed may be limited when the system is operated on
> >   the 65W AC adapter and no battery is installed.
> 
> From the same source:
> 
> "Solution: If maximum frequency operation is preferred in such
> situations, a 90W AC adapter should be used. "

which costs more. most of the time 65w is sufficient, especially when
it's extremely rare that a laptop is used without a battery. it's an
edge case.

anyway, macbook power adapters tell the macbook how much power they
have, so it's possible that a lower end macbook could avoid throttling
the cpu when a higher power adapter is used, but i don't know if it
actually does that.

also keep in mind that the batteries are now internal anyway so it's
pretty much guaranteed that they'll never be used without a battery
(not that it was particularly common before that). 

> >> Can you tell me what kind of program might cause a spike in power needed?
> > 
> > 3d gaming.
> 
> I can assure you that she will never ever if-she-lives-to-be-150 be a 3D
> gamer. :-)
> 
> Any others?

sure. basically anything that cranks the fans, but it's not just
running a particular app that does it. 

it's more along the lines of the above scenario, where not only is the
cpu/gpu doing a lot, but the optical drive is in use and there are
various attached devices, such as bus-powered hard drives, the display
is at full brightness, music is playing, etc. 

it all adds up.

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Thread

Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-16 20:02 -0400
  Re: Writer Needs Help nospam <nospam@nospam.invalid> - 2014-05-16 20:20 -0400
  Re: Writer Needs Help Your Name <YourName@YourISP.com> - 2014-05-17 12:57 +1200
    Re: Writer Needs Help Savageduck <savageduck1@{REMOVESPAM}me.com> - 2014-05-16 20:24 -0700
      Re: Writer Needs Help Savageduck <savageduck1@{REMOVESPAM}me.com> - 2014-05-16 20:29 -0700
  Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-16 21:09 -0400
    Re: Writer Needs Help nospam <nospam@nospam.invalid> - 2014-05-16 21:31 -0400
      Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-17 12:34 -0400
        Re: Writer Needs Help Your Name <YourName@YourISP.com> - 2014-05-18 10:33 +1200
          Re: Writer Needs Help Tim Streater <timstreater@greenbee.net> - 2014-05-17 23:39 +0100
            Re: Writer Needs Help Your Name <YourName@YourISP.com> - 2014-05-18 10:50 +1200
              Re: Writer Needs Help Tim Streater <timstreater@greenbee.net> - 2014-05-17 23:54 +0100
                Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-17 19:09 -0400
            Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-17 19:06 -0400
              Re: Writer Needs Help nospam <nospam@nospam.invalid> - 2014-05-17 19:09 -0400
                Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-17 19:21 -0400
                Re: Writer Needs Help Tim Streater <timstreater@greenbee.net> - 2014-05-18 00:36 +0100
                Re: Writer Needs Help Your Name <YourName@YourISP.com> - 2014-05-18 14:08 +1200
                Re: Writer Needs Help Tim Streater <timstreater@greenbee.net> - 2014-05-18 09:45 +0100
                Re: Writer Needs Help dorayme <do_ray_me@bigpond.com> - 2014-05-24 08:10 +1000
                Re: Writer Needs Help Tim Streater <timstreater@greenbee.net> - 2014-05-24 13:04 +0100
                Re: Writer Needs Help dorayme <do_ray_me@bigpond.com> - 2014-05-25 08:32 +1000
              Re: Writer Needs Help Savageduck <savageduck1@{REMOVESPAM}me.com> - 2014-05-17 16:43 -0700
                Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-18 14:09 -0400
              Re: Writer Needs Help Your Name <YourName@YourISP.com> - 2014-05-18 13:58 +1200
          Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-17 19:06 -0400
            Re: Writer Needs Help nospam <nospam@nospam.invalid> - 2014-05-17 19:08 -0400
              Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-17 19:25 -0400
                Re: Writer Needs Help Your Name <YourName@YourISP.com> - 2014-05-18 13:56 +1200
            Re: Writer Needs Help Your Name <YourName@YourISP.com> - 2014-05-18 13:50 +1200
              Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-18 14:10 -0400
                Re: Writer Needs Help nospam <nospam@nospam.invalid> - 2014-05-18 14:26 -0400
                Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-18 15:21 -0400
                Re: Writer Needs Help nospam <nospam@nospam.invalid> - 2014-05-18 15:37 -0400
                Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-18 15:56 -0400
                Re: Writer Needs Help nospam <nospam@nospam.invalid> - 2014-05-18 16:07 -0400
                Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-18 19:31 -0400
                Re: Writer Needs Help nospam <nospam@nospam.invalid> - 2014-05-18 19:48 -0400
                Re: Writer Needs Help Alek Trishan <alek.trishan@gmail.com> - 2014-05-18 20:44 -0400
                Re: Writer Needs Help nospam <nospam@nospam.invalid> - 2014-05-18 21:07 -0400
                Re: Writer Needs Help J Burns <burns4@nowhere.com> - 2014-05-18 23:42 -0400
                Re: Writer Needs Help Your Name <YourName@YourISP.com> - 2014-05-19 09:38 +1200
    Re: Writer Needs Help Your Name <YourName@YourISP.com> - 2014-05-17 13:43 +1200
      Re: Writer Needs Help nospam <nospam@nospam.invalid> - 2014-05-16 22:04 -0400

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