I recently picked up a dual core L335 CPU based X100e and I've upgraded it to near perfection; current configuration -> 4GB RAM, 80GB SSD, Bluetooth, Gobi 2000 WWAN. The preinstalled Win 7 32-bit factory image (with several unneeded software unistallations) runs perfectly. The machine is very fast and doesn't run hot (warm, but not hot). I really like it.
However, with Win 7 32-bit and 4GB of RAM, the machine is only able to use 2.75GB, due to the Microsoft limitation on 32-bit OS's and the integrated video chipset using 256MB of RAM. So, I thought I'd try Win 7 64-bit. Since Microsoft permits the use of the COA key with either bit version, I downloaded the Win 7 64-bit ISO and did a fresh, bare install. FYI, Lenovo does not offer a Win 7 64-bit option for X100e's, yet. (Which is odd, since they do sell some X100e models with 4GB of RAM.)
Everything went well. All Microsoft updates went quickly. I then downloaded the Lenovo System Update and all the updates I selected were installed smoothly. The machine ran incredibly fast and even scored higher than the 32-bit on the Windows Experience test.
However, there is one huge problem. The wifi adapter seems to power off after 5 seconds of use. You can go to one web page, then you have to wait from seconds to a minute until you can browse again. If you stream media, though, it won't disconnect and will continue to stream for the duration of the media - even an hour - but as soon as it stops, the connection is gone.
There is a similar problem with the Win 7 32-bit version, but it is easily fixed in the Power Manager. (In Power Manager, Advanced Settings, Wireless Adapter Settings, changed the default from Maximum Power Savings to Maximum Performance.) The problem in Win 7 64-bit is that the Wireless Adapter Settings does not exist in the Power Manager!!! The crazy thing is that both 32-bit and 64-bit used the same version of the Power Manager, 3.30. Where did that option go?
There is an option in the wifi adapter settings under Power Management called Allow the computer to turn off this device to save power, but whether it is checked or not, it has no effect. The power to the adapter is definitely being throttled and/or cut off.
Adjusting the PCI express Link state power management has no effect. OFF, Moderate Power Savings or Maximum Power Savings all behave the same way.
I tried installing and uninstalling drivers and packages in several different orders, nothing worked.
With or without Access Connections, the result is the same.
I even tried using the Realtek wifi driver (downloaded from Realtek), but it didn't help.
There are no issues at all with the wired Ethernet connection. It works perfectly.
So, my X100e is unusable with Win 7 64-bit. Before I go back to 32-bit, less performance and less usable memory, does any one have any ideas on how to fix this?!
I might just try one of the Intel wifi adapters to see if the issue affects all three of the wifi adapter options for the X100e, Realtek N, Intel N and Intel N + WiMax.
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