This message was posted on behalf of Intel Corporation
Thanks for posting.
The reason why there are only two options; Auto or 20 MHz is because the channel width is defined by the router or access point. If your router is set to channel width 40 Mhz, the adapter will comply as long as it is set to Auto.
You can confirm this and learn more about other advanced options for your wireless adapter here:
- Advanced Intel® Wireless Adapter Settings
Please let us know if there's anything else we can do for you.