On a Lenovo tablet running Windows 7, the Wi-Fi radio periodically is switched off by software, even though the physical radio switch is still in the ON position.
There is a setting in the IBM utilities on a Lenovo tablet (X61) that tells the system to turn off the Wifi radio after it has been inactive for a few minutes. It seems to be enabled by default. One consequence of this is that the wi-fi radio shuts off at seemingly random times - on bootup, coming out of sleep or hibernate, when passing from one wi-fi access point to another, etc.
To disable this setting, follow the instructions below:
- Open the ThinkVantage Poductivity Center software by pressing the blue ThinkVantage button over the keyboard.
- Hover over the ThinkVantage Technologies menu option to call out it's sub-menu.
- From the sub-menu, select Access Connections. This will open a window showing a list of files.
- Double-click Access Connections.exe. This will launch the Access Connections utility.
- Select the Tools tab.
- Click the Global Settings button. This will open the "Global Settings" window.
- On the Network tab of the "Global Settings" window, deselect the box next to "Allow the wireless LAN radio to be turned off when inactive".
- Click OK, and close the ThinkVantage software.
After this is cleared, wi-fi is still ocassionally slow to start up. However, it seems to be more consistently able to see and connect to wireless access points.