Screensaver and power off monitor not working

My fix was to disable the wake-up features of devices other than my keyboard in device manager (under power management untick "allow this device to wake the computer").

You can find out what woke your computer last by hitting the green button, typing cmd and hitting cmd.exe when it comes up on top of the start menu. After giving permission to run command, type "powercfg /lastwake" to find out what woke your computer last.

I found out which device was the culprit by typing into the command dialog
"powercfg /devicequery wake_armed"

That will tell you what woke your computer last.

my current 2 cents:
it seems that my screen saver / display power off stopped working when i updated the intel wifi driver. the old driver failed to stay connected to most n-routers, the new one is ok. i'm on win7-64, and yes, "allow this device to wake up the computer" is unchecked in the device manager.

so now i have a choice between n / display powering off. don't like it one bit.

anyone seen the same phenomenon?

EDIT:
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played with this some more. seems that the intel wifi nic is not the culprit after all - even disabling it the screen still stays on. plus - the machine does not run tasks scheduled to run on idle.

I have read the posts here with interest. Whilst I may be missing something, I don't understand why everyone is using a screensaver, in this day and age of flat screens. Unless you are still using a CRT monitor, there is no necessity for a screensaver. At least, that is my understanding. If anyone wishes to correct me, feel free: at 67 I am still learning and will accept any constructive criticism as education.

I have used a Logitech MK 250 wireless KB & mouse for almost 2 years now and have had none of the Power management problems here described. I have not used a screensaver since my first 19" flat screen, 5 years ago. (I now have a 24" Liyama.) This is not meant as criticism, I am simply intrigued by the fact that others still use a screensaver and would like to know if there is an actual technical reason for it.

Hi zdoe

Thanks for that: think I remember "fun". Some 40-odd years ago, before my first marriage.

Or maybe today, when my 6 year old granddaughter wants a (willing) playmate.

Think I will try a screensaver, and change it regularly. Is that allowed?

update2 - i think i've pinned down the culprit - usbaudio.sys.

New USB Audio Driver from Windows 7 SP1

so actually the problem is that the system is never idle enough to sleep / shut off the display. high cpu usage caused by external USB speakers. though i never experienced this with another USB audio stick.

extensive googling shows that win7-64 usb audio driver is at fault. this may get fixed once i upgrade to sp1. or - if i can find them, the xp-64 usb audio drivers might work.

anyone got an xp-64 disc that you could pull them for me from?