I'm invoking wpa_supplicant with -D nl80211 -i wlp3s0 when I do, immediately I get

wlp3s0: Could not read SSID from driver

When I use wpa_cli and issue a scan I get

<4>Could not read SSID from driver

I'm not sure what the problem is, my underlying card is the

Intel Corporation Centrino Advanced-N 6205 AGN

This is effectively stopping me from connecting with the new nl80211 driver. When I use -Dwext I no longer get the above but wpa_supplicant shows,

ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument

I had an issue with wpa_supplicant in which I had the same issue. I then used the wpa_gui and it offered an option to start the wifi service, and then worked.

If you still have issues, try testing a different program to interact with network configs, such as wicd-gtk

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