05-28-2009 01:18 PM
I have a T400 with Windows Vista 32bit SP1 (now SP2) and sometimes my ThinkPad won't wake up from sleep.
I have hybrid sleep disabled and I have Hibernation disabled aswell as the Hibernation Idle timer set to 60000 minutes.
If I put the laptop into sleep mode right now with Fn+F4, it goes into sleep fine and if I hit Fn+F4 a few seconds later it will wake up just fine. But, if I put it into sleep, then put the laptop in the laptop bag, open it up at work and hit Fn+F4 nothing happens. The cresent moon light is still on along with the battery light but it does not come out of sleep.
Any ideas? Is this a hardware issue or could putting in a bag have something to do with it not coming back from sleep (maybe the heat it gives off while sleeping is too much to be in a closed environment?).
05-28-2009 02:26 PM
Will your T400 wake up if you press just the Fn button?
If not, what happens when you press the silver power button?
05-28-2009 10:45 PM
Hello - can anyone help with this problem? Have a new T400 T9600 Vista here and it will not wake from sleep - always have to hard boot after putting laptop into sleep mode. Sleep icon illumuminated and hard drive spins up when pressing Fn (or other keys) but asbolutely nothing else happens and screen remains black. Would love to get this addressed. I've already verified a USB mouse and disabled it's ability to wake system from sleep; drivers are up-to-date and no conflicts. Also, the settings for hybrid are "off" or default.
Thank you in advance
05-28-2009 10:46 PM
05-29-2009 05:19 AM
I searched a bit in the forums and it appears that not being able to wake from sleep is a common problem when running Vista, for a variety of ThinkPads and other notebooks.
Here are some things you can try (links aren't to instructions but rather to original posts):
Press F1 at Thinkpad boot screen to get to BIOS setup. Then go to Security section and change the setting for Security Chip from Inactive to Active.This has worked for several people.
If you don't want to activate your security chip, an alternative might be to uninstall the Client Security Solution software. (I only speculate this might help the sleep problem.)
Install the latest ACPI Power Management and Power Manager drivers from the Device Driver Matrix. Also install the latest Intel turbo memory driver or matrix storage driver. (May as well update your other drivers too.)
Install or re-install Windows update "CAPICOM-KB931906-v2102". While you're at it, install all Vista updates.
There are scattered reports (example) that wake-from sleep was fixed by replacing the planar/motherboard. Others report that this did not fix the problem. I'm inclined to believe that in the vast majority of cases, the motherboard is NOT the problem. But if you've exhausted your other options you might want to explore that while your machine is still under warranty.
When waking your Thinkpad, use the Fn key (alone).
Please report success or failure. It would be most helpful to others if you include:
Good luck, and thanks for your reports.
06-09-2009 07:34 AM - edited 06-09-2009 07:35 AM
I thought I had this solved by just pressing 'Fn' to resume instead of Fn+F4 but just yesterday the laptop went to sleep after being idle and did not wake up when I pressed 'Fn'. What happen was after I pressed 'Fn' the battery light came on and the sleep light stayed on but nothing else happened. Pressing the power button did not do anything nor did pressing the ThinkVantage button or Fn+F4. Why the battery light would come on, I do not know. The laptop had a good battery charge level at the time of sleeping and I tried to wake it up just a few minutes after it went to sleep.
My model is 2764-CTO running Windows Vista 32bit.
06-09-2009 10:31 AM
I have the exact same model 2764-CTO. This is what I did to fix the sleep problem.
Go to bios
Disabled security chip
Save and exit
Went back to bios
Enabled security chip
save and exit.
Been going for a month without the sleep problem. Wakes up everytime now. Give it a try!
06-12-2009 09:10 AM
06-27-2009 08:19 AM
My T400 has the same problem!!!
Wheneven I "Fn+F4" my T400, I am a little worried. Because maybe next time it cannot wake up again. And I have to press the power key to reboot the computer...