I can't mirror my notebook screen to my Philips TV.
My notebook settings is: Windows 8.1, Core I5, 8gb, Intel Hd Graphics 4400, Wireless card Dell Wireless 1707
You are correct that Intel now allows specific Broadcom/Qualcomm-Atheros adapters, but the AR956X in the DW1707 is not on the list of widi compatible wifi chipsets.
At its inception, only Intel cards were supported - but though some others are now, not all chipsets are supported.
So, finally i could fix it.
DW1707 is Widi compatible, my trouble was VirtualBox Wireless Card, after uninstall widi worked again.
I think that after upgrading to Windows 8.1, all devices are now compatible, my tablet with Realtek wireless card is compatible.
thank you guys.