10-30-2011 10:33 PM
I have a fairly new x220t. I have had problems with getting the screen to turn off, or have the laptop sleep. I've uninstalled the Lenovo power driver and the power manager, and reinstalled them. I can get the x220t to sleep if I press fn + f4, but not if I leave it alone.
I haven't tried messing around advanced settings or seeing if some of the hardware is prevent the sleep. I don't have any bluetooth devlces or keyboard/mouse attached, nor Lan. Perhaps the wifi network card in interrupting the sleep/screen, I dunno. The basic settings seem reasonable.
I ran powercfg -energy and get 2 errors:
11-01-2011 04:24 PM
For enabling ASPM on windows check last post of this url :
Please lenovo can you confirm if the provided bios does not support ASPM and if it is planned ?