Wifi : can't find any SSID

[nolex90]

Hello guys. I have an Edimax ew-7318USg wlan card with an external powered usb hub.
But I can't connect any kind of wlan network and I can't see any SSID network. I use only WPA-PSK TKIP and SSID broadcast.

/etc/network/interfaces/:

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  GNU nano 2.2.6                File: /etc/network/interfaces

auto lo

iface lo inet loopback
iface eth0 inet dhcp

#allow-hotplug wlan0
#wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
#iface default inet dhcp

allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-ap-scan 1
wpa-scan-ssid 1
wpa-ssid "*****"
wpa-psk "*****"

dmesg:

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[  191.369841] usb 1-1.2.1: new high-speed USB device number 5 using dwc_otg
[  191.603379] usb 1-1.2.1: New USB device found, idVendor=148f, idProduct=2573
[  191.603413] usb 1-1.2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  191.603434] usb 1-1.2.1: Product: 802.11 bg WLAN
[  191.603452] usb 1-1.2.1: Manufacturer: Ralink
[  191.699088] cfg80211: Calling CRDA to update world regulatory domain
[  191.849916] usb 1-1.2.1: reset high-speed USB device number 5 using dwc_otg
[  192.274274] ieee80211 phy0: rt2x00_set_chip: Info - Chipset detected - rt: 2573, rf: 0002, rev: 000a
[  192.308178] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[  192.316224] usbcore: registered new interface driver rt73usb
[  192.530343] ieee80211 phy0: rt2x00lib_request_firmware: Info - Loading firmware file 'rt73.bin'
[  192.534038] ieee80211 phy0: rt2x00lib_request_firmware: Info - Firmware detected - version: 1.7

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pi@raspberrypi ~ $ sudo iwlist wlan0 scan
wlan0     No scan results

What should I do?

[DougieLawson]

What do you get from:
lsusb
ifconfig -a

[nolex90]

What do you get from:
lsusb
ifconfig -a

lsusb:

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Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
Bus 001 Device 004: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 005: ID 148f:2573 Ralink Technology, Corp. RT2501/RT2573 Wireless Adapter

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pi@raspberrypi ~ $ ifconfig -a
eth0      Link encap:Ethernet  HWaddr b8:27:eb:1d:1b:41
          inet addr:192.168.1.80  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8628 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3614 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:8031490 (7.6 MiB)  TX bytes:476434 (465.2 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

wlan0     Link encap:Ethernet  HWaddr 00:1f:1f:01:f3:c8
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

wifi router is near my pi in 2m.

[pluggy]

I'd comment out anything to do with eth0 in /etc/network/interfaces as a trial. It sometimes causes problems.

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auto lo
auto wlan0
iface wlan0 inet static
address 192.168.1.248
netmask 255.255.255.0
broadcast 192.168.1.255
gateway 192.168.1.1
wpa-ssid "EE-BrightBox-w99fa7"
wpa-psk "whatever"
wireless-power off

Barebones with static IP. The last line is to stop certain adaptors going to sleep. It won't do any hurt to leave it in.

If you can find 'EE-Brightbox-w99fa7' you can sit on the wall outside and try and guess the password......

[nolex90]

I'd comment out anything to do with eth0 in /etc/network/interfaces as a trial. It sometimes causes problems.

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auto lo
auto wlan0
iface wlan0 inet static
address 192.168.1.248
netmask 255.255.255.0
broadcast 192.168.1.255
gateway 192.168.1.1
wpa-ssid "EE-BrightBox-w99fa7"
wpa-psk "whatever"
wireless-power off

Barebones with static IP. The last line is to stop certain adaptors going to sleep. It won't do any hurt to leave it in.

If you can find 'EE-Brightbox-w99fa7' you can sit on the wall outside and try and guess the password......

It can't find networks, and can't connect to the existed network. What should I do?

[redhawk]

It's possible the USB hub power supply isn't good enough to drive the Wifi adapter which could explain to lack of found networks.
Providing your Pi isn't the original rev 1 board with poly fuse USB ports (F1,F2) then I would suggest you dump the hub and connect it directly to the Pi.
Make sure your dongle is fully inserted into the USB port before the Pi is powered on and not after otherwise it may reboot.

Richard S.

[nolex90]

It's possible the USB hub power supply isn't good enough to drive the Wifi adapter which could explain to lack of found networks.
Providing your Pi isn't the original rev 1 board with poly fuse USB ports (F1,F2) then I would suggest you dump the hub and connect it directly to the Pi.
Make sure your dongle is fully inserted into the USB port before the Pi is powered on and not after otherwise it may reboot.

Richard S.

I solved the problem, but I dont know how.
The EW-7318USg doesn't find any networks. I replaced with TL-WN722N card and it works correctly.
Thank you all.