here is a link to my old post:
i did try ap_scan=1 long times ago.
i am no linux expert …
Hi i have insert 
ap_scan=1
in wpa_supplicant.conf. No i think reach works better…!
When using IBSS or AP mode, ap_scan=2 mode can force the new network to becreated immediately regardless of scan results. ap_scan=1 mode will first tryto scan for existing networks and only if no matches with the enabled networks are found, a new IBSS or AP mode network is created.