I have been having a problem with my Thinkpad R40. When I want it to go into standby or hibernate, I perform the necessary action and it goes in to it. All good and well.

However, When I open the lid up (or power it on for hibernate), the machine comes back on for like 20 seconds displays the windows desktop, then goes back into standby, and i have to manually bring it out again.

The only was I have found to stop this behavior is to disable "Power Management Driver", which is from IBM. This fizes the problem, but also leaves me iwth limited function of the Fn key combos.

I have tried reinstalling the drivers and still no luck. Everything is 100% up to date(bios, firmwares, drivers, service packs, etc). Any idea?

-Chris

The IBM think pad has had standby/hybernate problems for as long as I can remember! Do yourself a favor and disable them... or sooner or later you will lose data!

You're not alone.
There are hundreds of posts about this and similar problems on this site. Windows ACPI support and some mboard ACPI support just don't work properly together sometimes.
I have looked into disabling ACPI support in XP - the only thing I have found so far that works for sure is you can choose to NOT load ACPI support when you do a from scratch XP Setup, but that's not an option one wants to for most people.

"The only was I have found to stop this behavior is to disable "Power Management Driver", which is from IBM. This fizes the problem, but also leaves me iwth limited function of the Fn key combos."

Where did you do that? If it was in Windows, try leaving it enabled, and go into your bios and see if you can disable ACPI or pieces of it - if you can, try that. If you disable ACPI completely in the bios, you can still use Control Panel - Power Management and set your hard drives and monitor to shut off after xx minutes, and if the times are exceeded the computer will wake up fine when you press a key, or move your mouse (maybe not both)- Standby may or may not work, but in any case that is sometimes a way to get around the problem.

From what I found that "Power Management Driver" just controls some of the Fn key combos. For certain it controls the Fn+F3 (screen off) and the Fn+F12 combos (hibernate). I did a work around on the hibernate by programing the power key to put it into hibernate. http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=ibm&lndocid=MIGR-4GXPEG

It was the last item under "System Devices" in the control panel. Might be labeled "Thinkpad PM Device" or "IBM PM Device", this was in windows XP Pro SP2. I am trying to get my hands on an older version of this driver (3.31 or earlier) and test that.

So far standby and hibernate both work find like that.

On the ACPI, I do remember there being a way of disabling it once windows is installed. I did it on one of my desktop PCs once.

Found it:
http://www.everything2.com/index.pl?node_id=1073586

"On the ACPI, I do remember there being a way of disabling it once windows is installed. I did it on one of my desktop PCs once."

You can do it easily in Win ME and below (you disable both LoadPowerProfile lines in Msconfig - Startup), but I have found no other way of doing it in XP that works for sure other than choosing to not load it when you run a fresh Setup.

"Fresh Install with no ACPI", and lots of other XP tips to get rid of annoyances here:
http://www.logan.eclipse.co.uk/xp%20hints%20&%20tips.htm