Battery drain after hibernation

[me93942001]

My t60 has 95% battery left before the hibernation and the next morning, it became 88%. (I unplugged it after the hibernation process) I noticed there are some static noise coming from the bottom after the hibernation. Currently, I am running Vista Business. Actually, because of this, I rolled back to XP and see if it is the same. It was completely silent in XP and the battery wasn't drained. Does anybody experience this problem. Or it is a "feature" from vista? Thanks in advance

[arni]

This sounds strange, since in hibernation the computer is completely shut off. So there is no power consumption after all.

The way you described this problem i would guess your TP only goes into standby mode.

[me93942001]

Thanks for your reply.
That sounds logical. However, I specificly click on the Hibernation rather than some keyboard shortcut. It still brings me to the situation described above. Are there any other way to put it into complete shutdown in Hibernation mode?

[arni]

Hm sounds strange. Maybe something is wrong with your energy configuration inside windows. Try following command in a command window to verify that hibernation mode is active:

powercfg -H off
powercfg -H on

Watch your event log for any errors or information. Further try to delete your hiberfil.sys thru disc-cleanup. And verify your settings in power manager if installed. Maybe there are settings active, which prevent you from hibernation.

Other methods of putting your TP into hibernation are via F12.

[bontistic]

I think I may have seen this before. If you hear same noise, can you please try to remove your battery and insert it again after unplugging from the wall? This could be a component that did not shut off normally. To confirm that you system did go into hibernation, the sleep LED should be off after the hibernation process.

[me93942001]

The sleep LED does turn off after the hibernation process. I just realized if hibernation is done using the battery, the noise doesn't exist and I guess it won't drain the battery. On the other hand, if I have it on AC during the hibernation and unplug it afterwards, the magic noise is there. How weird! I guess from now on, I have to unplug it from AC before hibernating it.
Thanks for all the great replies!
Just one last thing, is it just me or if any of you notice that it takes longer to hibernate in vista than xp?

[arni]

Yes my machine also need longer to get into hibernation under vista. But that's marginal. The benefit i had with vista is that it goes into hibernation without hitches. Under XP sometimes some processes won't shutdown preventing hibernation mode thus finding battery drained because the laptop was alway on.