m1210 coming out of hibernate uses more battery power

I was testing out the battery life of my m1210 and I noticed something interesting.

First, this is the specs of my m1210:

core 2 duo 2.0 ghz
7400 nvidia graphic card
355 bluetooth module
1500 draft n wifi module
av package
auo lcd
1 gig memory
60 gig 5400 rpm hd
9 cell battery

I measured the discharge rate of my 9 cell battery using notebook hardware control's (nhc) monitoring tool. When coming out of a cold boot with

lcd level at 3
max battery (1 ghz)
nvidia powermizer set at max power savings
bluetooth turned off
wifi turned on with power savings mode on
webcam disabled (via device manager)
quickset running
nhc running
no other applications running

I get a battery discharge rate of around 14-15 watts.

Now if I hibernate my machine and then turn it back on, with the exact same settings, I get a battery discharge rate of around 17-18 watts.

Has anybody experienced this or would be willing to try to reproduce this?

Any ideas as to what the problem could be?

Thanks

 

For how much longer is that battery discharging at that rate? Constantly? what if you hibernate again and then start it again? That's also a fairly small difference... could NHC be getting a bad reading from the measurement hardware? The way to really test is to let it run out of battery before you hibernate it and time it, and then try the same thing after hibernating it and restarting it. If there's more than about 10 minutes of battery difference, I'd worry. The way to scientifically test it would be to put a watt-meter between the computer and the wall, with the battery fully charged, then see how much it draws under freshly-started conditions for a while (doing the same tasks), and then under un-hibernated conditions.

 

Pretty weird you bring this up- I noticed something simular on my D620 however I never tested it.

I placed my laptop to hibernate when the screen is closed and often times when I restart it- I see the battery life is much lower than when I closed the case. I havent looked into it too much but that was just my observation.

 

Just an update on this. The problem turns out to be the builtin webcam.

If you just disable the webcam in the device manager and u hibernate and come back in, the power to the webcam is turned back on for some reason.

The solution is to disable the webcam's usb port. This disables power to the webcam and the power isn't turned back on after the laptop is un-hibernated.

 

Since the webcam is USB-based, it's very likely the USB power fix at microsoft.com might correct the issue. Check out http://support.microsoft.com/kb/918005/en-us

 

thanks for that lancorp.

I knew about the usb power bug, but I thought it would be automatically downloaded by system updates, but checking my system, it looks like I don't have that fix.