Hi
I'm with my rt-n56u on 17.01.4, r3560. When I disable 5Ghz wifi with Luci (or wifi down cmd) I cannot reactive it in Luci (or wifi up cmd). To be exact: According to Luci the interface is up, but I cant see the SSID with my mobiles. I have to reboot the router to get 5GHz back.
My wireless config:
config wifi-device 'radio0'
option type 'mac80211'
option hwmode '11g'
option path 'pci0000:00/0000:00:01.0/0000:01:00.0'
option channel '3'
option htmode 'HT40'
option country 'DE'
option txpower '20'
#option noscan '1'
config wifi-iface
option device 'radio0'
option network 'lan'
option mode 'ap'
option ssid '2G'
option encryption 'psk2'
option key 'mykey1'
config wifi-device 'radio1'
option type 'mac80211'
option hwmode '11na'
option path '10180000.wmac'
#option htmode 'HT20'
option channel 'auto'
option country 'DE'
option txpower '20'
option noscan '1'
option log_level '0'
config wifi-iface
option device 'radio1'
option network 'lan'
option mode 'ap'
option encryption 'psk2'
option key 'mykey2'
option ssid '5G'
Also curious: The 5G option htmode 'HT20' has to be commented out and the channel to be 'auto'. If try to define a fixed a channel 5GHz doesn't start (even after reboot) at all.
I know there are some other post here where problems w/ 5GHz are reported. This might be the next.