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I upgraded laptop Toshiba M5 with NVIDIA GeForce 8600 GT video card to Windows 7 32 Ultimate , but the Sleep mode option is disabled on the Shut Down menu (visible, but disabled). I checked the available Power options, but I couldn't see a setting for enabling the Sleep mode. I checked the device manager and all drivers are working normally.
I would like to ask what else I can do in order to enable the Sleep mode.

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migrated from Feb 7 '10 at 0:42

This question came from our site for system and network administrators.

It can also be your display drivers. Open an admin mode cmd and do:

powercfg -a

If it complains about VGAPNP.SYS, you have your prime suspect right there.

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Yes, I get this message The VGAPNP.SYS display driver does not support standby. But how do solve this issue? – Kuldeep Jain Sep 6 '12 at 12:46
You need a display driver that supports it :/ You'll have to look for them, but maybe there is no suitable driver for your machine – Victor Sep 11 '12 at 10:20
I have the same issue but powercgf -a does not report any obstacles. It just says that S3 is disabled by current energy policy. Duh! Any other ideas? – Robert Klemme Dec 11 '12 at 16:46

It could be an issue with the Multimedia settings. Go to the "Power Options" control panel and underneath the active power plan, select "Change Plan Settings". From there, click "Change advanced power settings". From there, find the node "Multimedia Settings" >> "When sharing media" and from there select "Allow the computer to sleep" for the "On battery" and/or "Plugged in" states.

Media center apparently will disable sleep when it thinks that media is being shared.

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Hmm, I have the same problem, but this suggestion does not solve it for my case. – Bernhard May 28 '12 at 12:32

I was able to resolve the issue for my Lenovo ThinkPad T420 by installing this driver. Now sleep/standby works just fine on my TP.

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