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32 Posts

11-06-2009

Austria

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Re: Possible solution to low battery capacity in Win7

2009-11-14, 19:35 PM

actually when i recalibrated i had 69 instead of 70..... but still i am quite happy

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164 Posts

07-06-2009

Germany

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  • Message 72 of 183

Re: Possible solution to low battery capacity in Win7

2009-11-14, 21:48 PM

I'm having similar battery life problems with an SL500 - ~25W power draw instead of the usual 16W under XP... not really acceptable. in my case, removing the Power Manager didn't help :(

 

-edit- Win7 Professional x64, BTW.

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25 Posts

11-01-2008

Arizona

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  • Message 73 of 183

Re: Possible solution to low battery capacity in Win7

2009-11-17, 14:37 PM

Still waiting for an answer Lenovo.....   Please just let us know you actually care, at least tell me that you are working on it or something... Please....

 

 

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45 Posts

04-28-2009

Boston, MA

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  • Message 74 of 183

Re: Battery Life Decrease In Windows 7

2009-11-17, 15:12 PM

T400, switchable graphics running in integrated-only mode with no Power Manager (I can't stand it in Windows 7, and find it unnecessary aside from switching graphics, which doesn't seem to work properly anyways).

 

I ran the cmd power test and got the following errors (among others that are my fault):

 

 

Platform Power Management Capabilities:Adaptive Display Brightness Support
This computer does not allow Windows to automatically control the brightness of the integrated display. Installing the latest system firmware (BIOS) may resolve this issue.

 
Platform Power Management Capabilities:PCI Express Active-State Power Management (ASPM) Disabled
PCI Express Active-State Power Management (ASPM) has been disabled due to a known incompatibility with the hardware in this computer.

 

 

As for the first one, I've installed the latest BIOS update.  Also, Windows does seem to change the brightness (I have it set to dim after a short period).

 

As for the second issue, since others have it as well, I'm holding this one to Lenovo to fix.  Soon.  Please.  Without needing to install the POS Power Manager.

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45 Posts

04-28-2009

Boston, MA

79 Signins

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  • Message 75 of 183

Re: Battery Life Decrease In Windows 7

2009-11-17, 15:13 PM

Also, what program can I use to see how much power my computer is actually using?  I take it (from looking) that Task Manager does not handle this.  Thank you.

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59 Posts

10-06-2008

Toronto

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  • Message 76 of 183

Re: Battery Life Decrease In Windows 7

2009-11-19, 15:14 PM

The best way to see actual draw is using a Power Meter that goes directly into your  wall socket.  Although, I assume most people don't have one of these.

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9557 Posts

01-13-2008

United States of America

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  • Message 77 of 183

Re: Battery Life Decrease In Windows 7

2009-11-20, 1:34 AM

Just adding my +1 here and subscribing to this thread.

 

My 9-cell T400 has lost over an hour of runtime since switching from VIsta Business 64 (Lenovo media) to Windows 7 Pro 64 (Microsoft media + Lenovo apps and drivers).

 

Not good.

 

Z.


The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.


The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored - questions and answers belong in the forum so that others may contribute and benefit. ... GeezBlog

 

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12 Posts

12-07-2008

evanston, il

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  • Message 78 of 183

Re: Battery Life Decrease In Windows 7

2009-11-20, 17:06 PM

I have the same problem. Recently got a X25-M, installed it together with Windows 7 64bit (MSDNAA version+ Lenovo drivers). Now, instead of increased battery life I have less.

 

One very interesting thing I noticed is this: I turn on the computer and after login I disconnect the power supply. I get 7-8 hours battery life (9W min). I do not change anything, just press the power button and go into sleep. Immediately I wake the computer up and I get only 5-6 hours (13 W min). Did anybody else notice this?

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33 Posts

05-25-2009

Canada

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  • Location: Canada
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  • Message 79 of 183

Re: Battery Life Decrease In Windows 7

2009-11-21, 4:25 AM

I am having the same problem. A huge drop from Vista 64 Business to Windows 7 Professional 64.

 

Before my T400 would get about 4hrs on integrated now I get around 2 hours even after updating everything to the latest drivers. Please fix this Lenovo!

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12 Posts

12-07-2008

evanston, il

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  • Message 80 of 183

Re: Battery Life Decrease In Windows 7

2009-11-21, 4:48 AM

Ok, more results.

 

When I wake up after sleep, I see 14-18W average, and 5 hours tops. Then I select "high performance" in switchable graphics, and the battery life drops to 3-4. When I select back "energy saving", I get 6-7 hours, ~10W as usual.

 

So for me, this would be a workaround for now.

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