Solve IdeaPad Y400& Y500 wireless limited problem under Win8

Knowledge point analysis:
Recently, more friends feedback using Y400/Y500, pre-installed windows 8 system, connect home router AP, high probability of wireless appearance Restricted access to the Internet, you need to reconnect to WIFI after the problem occurs, the network exclamation point icon appears in the lower right corner. As shown below:

After analysis, the wireless network card configured by the user model is Broadcam 4313. This problem can be changed by Wireless network card properties to solve,
network card and router compatibility and Microsoft's latest window 8 operating system caused such problems, not the machine's hardware failure.
Operating steps:
Step 1: Turn off the automatic power saving option of the wireless network card.
Click “Device Manager", select <;Wireless Network Card Properties", click “Power Tube








































Compatibility
Right-click on the connected AP signal, select “View Connection Properties"""Security”“Advanced Settings"&#>&#& As shown below, if there is no such option, it is recommended to encrypt the wireless router.
Change to AES encryption method:

Step 3: Roll back the wireless network card driver
Select “Device Manager", right click to select "Wireless network card properties", click “ Driver & rdquo;, select “ rollback driver & rdquo;, as shown below:

Step 4: Optimize Windows 8 TCP configuration