Hibernate still consume power?

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henryan · #1 Post by **henryan** » Wed Nov 14, 2007 7:41 pm

I hibernated my T61p and unplug the power in the morning. When I turn it back on in the evening, I noticed there is about 6% power loss. Should it

pibach · #2 Post by **pibach** » Wed Nov 14, 2007 8:10 pm

Yes.
I suppose the USB to be the culprit. If you sleep the device without AC wired, USB will be powere3d down. Or goto BIOS and disable that.

Another possibility is Wake on LAN. You have to switch this off in both BIOS and Device Manager.

henryan · #3 Post by **henryan** » Wed Nov 14, 2007 10:15 pm

How can I get into BIOS setting? The blue button only leads to rescue & recovery.

steveg47 · #4 Post by **steveg47** » Wed Nov 14, 2007 10:34 pm

henryan wrote:How can I get into BIOS setting? The blue button only leads to rescue & recovery.

Press the F1 key at bootup to enter the bios.

#5 Post by **ryengineer** » Thu Nov 15, 2007 2:53 am

henryan wrote:How can I get into BIOS setting? The blue button only leads to rescue & recovery.

There is also an option in the Rescue and Recovery that can lead to BIOS, called "Start setup utility". If you have the newer 4.1 version (of Rescue n Recovery) you would need to change the view.

tpribors · #6 Post by **tpribors** » Thu Nov 15, 2007 12:15 pm

Hibernate (Fn+F4) does use power. All memory is retained, but peripherals are powered down (e.g., hard drives) or placed in a lower power "wakeup" mode, e.g., NIC cards. Pressing any key or other wake events, e.g., NIC, will wake it up. Hibernate recovery is very quick - Windows wants the login screen to be there in 2 secs or thereabouts.

Suspend (Fn+F12) saves all memory to a suspend file and changes the boot up to restore that context. You then power up and unless interrupted by F8 the context previously saved is restored.

#7 Post by **rkawakami** » Thu Nov 15, 2007 1:05 pm

Ah, actually in the context of Thinkpads, hibernation mode (Fn+F12) is the full powered-down state where the contents of the memory have been written to a disk file and the system completely (in theory) shut down. Standby, or sleep, (Fn+F4) is the state where the system is placed in the lower power consumption mode, with memory still powered up, and ready to resume operation in a few seconds with an Fn keypress.

There has also been some notice taken in the T2x world about hibernation consuming some battery power. This thread,

http://forum.thinkpads.com/viewtopic.php?t=47929

documents some of the things that were found. Basically, removing the battery for a few seconds after the system was placed in hibernation mode seemed to have prevented the small "leakage" of charge.

egibbs · #8 Post by **egibbs** » Thu Nov 15, 2007 1:06 pm

tpribors wrote:Hibernate (Fn+F4) does use power. All memory is retained, but peripherals are powered down (e.g., hard drives) or placed in a lower power "wakeup" mode, e.g., NIC cards. Pressing any key or other wake events, e.g., NIC, will wake it up. Hibernate recovery is very quick - Windows wants the login screen to be there in 2 secs or thereabouts.

Suspend (Fn+F12) saves all memory to a suspend file and changes the boot up to restore that context. You then power up and unless interrupted by F8 the context previously saved is restored.

I think you got the names (but not the key combinations) reversed. Fn+F4 is sleep, FN+F12 is hibnernate. Sleep is where memory is still powered up, Hibernate is where RAM is written to disk and powered down.

Hibernate is not off though - some parts are still powered, though a full charge should last at least a week in Hibernate mode. 6% over 1/2 day does not sound excessive.

Ed Gibbs

umeet · #9 Post by **umeet** » Wed Nov 21, 2007 5:19 pm

I have relatively new T61 and it behaves very odd in hibernation.

For example it consumes huge amount of battery when hibernating.. drainage is something like 1-3% per 1hour (EDIT: 6cell battery, lasts about 5h with wlan in Vista)! That is more than in suspend to ram I guess (I don't use it that often). When laptop is put on hibernation everything else should be shutdown expect RTC (or BIOS clock if you prefer), so only small part of battery should be consumed by that RTC and normal selfdischarging of battery. Or this is what it should be.. if it does something else in thinkpad, I wonder why? Of course I have disabled all Wake-up on Lan etc. stuff.

And also it seems to boot up by itself from hibernation occasionally and this should be impossible since only rtc is running (or should be). Altough I just found out that in some BIOS's windows could trigger BIOS to boot up when certain time is passed for scheduled tasks, so I checked all the scheduled tasks and there were none which would have that option selected.

I googled a bit and found this http://forum.notebookreview.com/archive ... 83193.html
so this seems to be common problem with Windows Vista. I have 32bit Business (so maybe this is in a bit wrong place then?).

But I wouldn't blame totally Vista about it, since there has to be somekind of hardware issues too, if the laptop is supposed to shutdown and something is left consuming power.

I also found out that some users believe that Ubuntu or other Linux distribution would have changed ACPI settings from BIOS so that the laptop wouldn't shutdown entirely in hibernation.. I also have Ubuntu installed and I messed quite a lot with it to get out more batterylife.

So I have quite a many variables here and I'am frankly quite desperated about this since is use my thinkpad mostly couple hours at the time and then it might be 4-12h in hibernation before I get to home and slam it on A/C .

So, any thoughts? Go for an apple? (quite a huge first post... and sorry for my bad English)

Hibernate still consume power?

Hibernate still consume power?

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