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I have a very strange issue with my network connection on my laptop.

My LAN connection disconnects every time my lcd screen light turns off. and when I press a key or move the mouse to turn on the screen the lan connection restarts and gets connected again. but it will be disconnected all the time that the screen is off.

System: Lenovo-T500 ( Win7 Pro x64 )

I have a PC with the same OS connected to the same network and don't have this problem with my PC it's only happening to my laptop.

this will even happen if I turn my laptop's screen off manually using a function key.

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Is the laptop going to sleep when the screen goes off? – sblair May 12 '11 at 22:08
No. I've turned off all the setting so that it wouldn't go to sleep or hibernate. – Hamid May 12 '11 at 22:15
Have you checked the setting that is accessed through the LAN > properties > configure button? – Tog May 12 '11 at 22:29
I disabled that too (after you mentioned it). but still lan get's disconnected. – Hamid May 12 '11 at 22:43

Check your power settings and make sure your network card will not disconnect to save power. Here is a simple how-to Windows 7 Power Settings.

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I checked there are no options enabled to turn of the network card. – Hamid May 14 '11 at 0:43
up vote 0 down vote accepted

OK, I finally managed to fix it with the latest Intel's network driver for Windows 7.

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