Power options - CPU states missing??

I have a problem with the power options on an Acer 1830.
The minimum and maximum processor states are missing under the power options. This means that the CPU does not clock down when on battery.
Is there any solution for this apart from a complete windows reinstall?

 

Update your chipset drivers?

 

Dynamic CPU clocks are managed by the BIOS with technology such as SpeedStep (for Intel CPUs), so you don't have to manage the CPU clocks via Windows unless you want to force it to run at a certain frequency.

 

Perhaps Acer's "ePower"-Tool helps here.
I guess, some registry entries are missing or disabled.

@Bog: most stuff (at least the fine tuning) is controlled by the OS and the drivers nowadays.

Michael

 

That is true, but CPU frequency is controlled via the BIOS, which is higher-level control than the OS or the drivers the OS runs.

 

Well, in some Bios' you can enable or disable the CPU power management, but that's all. And in Laptops, the configuration options are extremely limited.

Michael

 

Open regedit
Find this key

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\54533251-82be-4824-96c1-47b60b740d00\893dee8e-2bef-41e0-89c6-b55d0929964c

and this key

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\54533251-82be-4824-96c1-47b60b740d00\bc5038f7-23e0-4960-96da-33abaf5935ec

And change attributes key from 1 to 0, it should then show up as an option in the advanced power options

 

thanks

checked the registry keys and it is the same as on my 1520, where it works..
The BIOS has no option to set speedstep...
Any other registry keys? or could it be that the powrprof.dll is corrupt?

 

some power states cannot be set using the existing windows gui. You need to run command line (via batch files) to manipulate all of the options.

research this command on technet:

powercfg /qh scheme_current sub_processor

and you'll have an idea how to begin.

 

Fixed that for you.
As you go down to the hardware it is lower level, just like programming language, assembly is low level, C++ is higher level.

 

I stand corrected. Thanks, that is what I meant to say. I just think the OP should know that low level control of CPU states means that it is not meant be managed by the user; it is all done automatically.

 

Don't assume that the windows gui tools give full access to the machine hardware.

 

Ok, this function should be there: It is there on my 1520, it is there on my 1810t and its even there on my office machine, which is a desktop...why is it not there on the 1830?
Like I said, I'm suspecting some registry problem...but I have no idea which keys control the advanced power settings window behavior.

 

Have you tried Acer's ePower-software? Perhaps it "repairs" these registry keys.

Michael

 

different motherboards, different biosii, they will all allow different things.

Research the powercfg command line I mentioned. That's the definitive way (via msft an intel) of changing things anyway.

First you list out the options for your machine, then you decide what to change.