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Intel speedstep on centrino doesn't work Intel speedstep on centrino doesn't work
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Intel speedstep on centrino doesn't work
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Old 7th April 2005, 09:53   #1
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Intel speedstep on centrino doesn't work

I've bought a new laptop, an acer aspire 1681.

It's based on the centrino platform, equiped with a Pentium M 1.5Ghz Dothan.

Everything works fine except the processor runs at the same voltage & speed (1.34v, 1.5Ghz) at all time, even when running on max battery power scheme.

I've tried changing settings to different power schemes (screen saver > power). The acer powermanagement scheme has processor speed below max. Intel freq ID tool says my processor is capable of multiple speeds, but it's currently running at maximum. What am I doing wrong?

Config:
Pentium 715 (dothan 1.5ghz)
855G chipset
Preinstalled Windows XP Home, SP2

Tried:
latest intel chipset drivers
latest acer powermanagement application
bios
windows update

Verified proc speed with:
Throttlewatch (cool app!)
wcpuid
cpu-z
intel frequency id tool
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Old 7th April 2005, 11:17   #2
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is this any help?
http://www.bay-wolf.com/speedstep.htm
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Old 7th April 2005, 12:42   #3
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Usefull link., thank you.

It states the speedstep driver is built into winxp, so I shouldn't install one. : /

It also states that if you want to check whether it's working, check with intel's freq id tool... which i did and it said it works.

Last option is to flash bios... but there's no new bios for the laptop.

Trying linux now...
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Old 7th April 2005, 15:52   #4
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Why does it run in battery mode?
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Old 7th April 2005, 16:00   #5
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Because it's unplugged?

It does not seem to be a software problem. Linux fails to adjust the speed to. It claims it's adjusting the speed (just as windows), but the processor stays at maximum speed (superpi at 1.5Ghz = 42s, superpi at "600mhz" = 42s...).

Damn! Last hope is a biosflash.
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Old 7th April 2005, 16:13   #6
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I was trying to ask "How does it run in battery mode?" - fingers ahead of my brain
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Old 7th April 2005, 16:22   #7
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Same problem in battery mode: utility claims cpuspeed is 'low', yet it still runs at full speed.

It's most likely not a simple software problem, as linux suffers from the same problem.

There's no new bios, but perhaps i can try an older one.
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Old 7th April 2005, 16:27   #8
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Acer ultility?
My old Toshiba uses proprietary utility; and my brother Centrino 2Ghz is the same.
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Old 7th April 2005, 17:08   #9
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Acer utility replaces the built-in windows power management. Both have no effect on the processor speed (but both claim everyting is ok).
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Old 7th April 2005, 17:36   #10
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Bios flash to older biosversion didn't help either. : /

Sucky Acer.
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