09-24-2012 04:17 AM
After install all drivers from Lenovo support site,My Ideapad S400 Device manager still show 1 Unknow device .The Hardware Id is
"ACPI\AOA2011" .How to correct this problem? Thanks.
Solved! Go to Solution.
09-24-2012 06:01 AM
Actually that is Lenovo Smart Connect (Update), the driver file is missing in the support site. It is found on the Lenovo China Support Site.
The link to the file is:
This is for both Windows 7 32bit and 64bit Edition.
File Size: 4.74 MB
11-08-2012 07:31 AM
I've just installed my new S400 with Win7 Professional 64-bit and there is the same problem with the unknown device. But when I try to install the above mentioned Setup I only receive the message "This machine is not Lenovo, Smart Update quit.".
Has anyone an idea how to fix the problem?
12-20-2012 09:48 PM
I have to same problem with my Ideapad S300. I tried several times to reinstall Windows again. When I installed it into SSD then it worked. Anyway 24gb is not enough for Windows 8 so I tried to install to HDD. First time with UEFI then I tried without UEFI. Both time I can't install last driver ACPI\AOA2011
do you have any idea what it should be? I download Lenovo smart update from different location because the original one wrote me the same problem like SideWinder80 that "This machine is not Lenovo, Smart Update quit."
01-17-2013 02:12 PM
01-17-2013 02:14 PM
Your power management system is missing a driver.
Tap or click to download and install the new driver from the Lenovo Group Limited website
01-18-2013 09:51 PM - edited 01-18-2013 09:52 PM
Hi energy cut didn't solve my problem. I still miss driver.
could somebody send me a image from original windows? Maybe it will be great to recover back original partitons which I removed with my first installation.
02-11-2013 04:35 PM
Problem "Missing ACPI\AOA2011 driver"?
Ok, I have now registered to write you. ;-)
The solution is: You will need the drivers "Always Online Always Connected Driver".
"Lenovo Corporation, Lenovo AOAC driver"
The package is very small and contain 3 small files. (LAD.inf; LADx64.cat, and in direcory "x64" the file LAD.sys)
1. Search the driver (I can not upload the driver here)
2. Go to the device and select "Locate driver on this PC"
3. change to the directory where the file "LAD.INF"is located.
4. Click ok and the driver is installed.
Sorry for my bad English