Descobri isso.
Os Thinkpads têm um software Think Vantage Access Connections, por padrão, o compartilhamento de arquivos e impressão está desativado em todas as conexões, e o badah boom é fixo.
- Double click on the ThinkVantage Access Connections applet in the notification area.
- Click on the MANAGE button on the toolbar
- Select the SSID (or other network connection) where you want File Sharing to work, and click EDIT
- Click on the ADDITIONAL SETTINGS tab
- Next to "Network Security", click the SETTINGS button
- The first option in Security Settings is "Disable file and printer sharing". UNCHECK this box. Click OK for 3 levels of dialog boxes, then close Access Connections
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