Strange wifi issues!

[fabio199618]

Good morning/evening to everyone!

I recently bought a raspberry pi 2 along with a pre-imaged NOOBS microsd.
I am a newbie, so i don't know anything about Linux and so, but I would like to learn something, so I purchased the Pi.

After succesfully installing raspbian, I found I wasn't able to connect to wifi (Router zyxel p600 series) by using the edimax n150 wifi adapter.
The network has been recognized by the adapter, but every time I try to connect, after inserting password, the blue light on the adapter turns off.
At first i thought i had missed something during setup, or that i didn' turn on some options, so i checked every possible option but i didn't find anything. Then i thought i had probabily been inserting the wrong password for my network, so i checked it 4 times, but nothing. Then i tried to connect with my galaxy s2 using it as a router, and it worked! I followed the tutorial about wifi issues on the forum and i renamed some lines with terminal, in order to activate auto connection to wifi, but nothing.
I also thought my microsd could have been imaged with an older version of raspbian, so i downloaded again NOOBS installing package from the official site, I cleaned up the sd and re- installed raspbian. With no results.

Nothing works and i don't really know what to do... any suggestions?

Thanks a lot!

[Shea]

The problem seems to be power related. make sure you have a power supply which can more than 1.2 amps of current, and add "max_usb_current=1" to /boot/config.txt.
If you already did that, then describe your hardware, and software setup. Try Jessie lite, and see how it goes...

[fabio199618]

Thank you very much for the help you provided, but unfortunately it didn't work out.

First of all, i have to say i'm using the official RasPi power supply (5V 2000mAh), so i think the problem is not power related.

I tried to add max_usb_current=1, but it didn't change anything. I also installed Jessie Lite, with no results.

I'll give more hardware specifics just in case it's needed.

I'm using a Raspberry Pi model 2 with the official power supply.
MicroSD 8 gb imaged with raspbian Jessie (no lite).
My adapter is the Edimax N150 wi-fi nano usb adapter: http://www.edimax.com/edimax/merchandis ... /ew-7811un

The router i'm trying to connect with is the Zyxel p660hw: however i don't think it's important, because i tried to connect with another router ( i don't know the model) and it didn't work either...

Ethernet cable with that router works fine, phone used as a router also works well.

Thanks in advance!

[fruitoftheloom]

Thank you very much for the help you provided, but unfortunately it didn't work out.

First of all, i have to say i'm using the official RasPi power supply (5V 2000mAh), so i think the problem is not power related.

I tried to add max_usb_current=1, but it didn't change anything. I also installed Jessie Lite, with no results.

I'll give more hardware specifics just in case it's needed.

I'm using a Raspberry Pi model 2 with the official power supply.
MicroSD 8 gb imaged with raspbian Jessie (no lite).
My adapter is the Edimax N150 wi-fi nano usb adapter: http://www.edimax.com/edimax/merchandis ... /ew-7811un

The router i'm trying to connect with is the Zyxel p660hw: however i don't think it's important, because i tried to connect with another router ( i don't know the model) and it didn't work either...

Ethernet cable with that router works fine, phone used as a router also works well.

Thanks in advance!

Plug the adapter into the RPi and post the output of:

uname -a

lsusb

Post the results in code tags, thank you.....

[fabio199618]

Thanks for the patience!

Here are the results of uname a

Code: Select all

Linux raspberrypi 4.1.13-v7+ #826 SMP PREEMPT Fri Nov 13 20:19:03 GMT 2015 armv7l GNU/Linux

These are the results of lsusb:

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Bus 001 Device 007: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
Bus 001 Device 005: ID 0b38:0010 Gear Head 107-Key Keyboard
Bus 001 Device 004: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

[fabio199618]

Update: I tried installing openElec and wifi works just fine, maybe the problem was Raspbian-Related...

Any suggestions?

[rurwin]

I have an Edimax 7318Ug working on a Pi2 using the latest Raspbian. It worked straight away with no problem. The router is a Netgear R7000.
I have had the impression in the past that this WiFi adapter might be power-hungry, it didn't like being used on an unpowered hub hung off a Windows Laptop, but I haven't had to use that max_usb_current config line, so maybe not.

Code: Select all

Bus 001 Device 004: ID 148f:2573 Ralink Technology, Corp. RT2501/RT2573 Wireless Adapter

So it's not the same.

[dgordon42]

The Edimax 7811Un works well with Raspbian without having to make any changes to the default /etc/network/interfaces file.
You do need to tell the Pi your WiFi's SSID and Password, and you can do this using the Network icon on the top left of the GUI, or you can add the details to the /etc/wpa_supplicant/wpa_supplicant.conf file. This file is owned by root, so use something like

Code: Select all

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

to edit it, and make it look like:

Code: Select all

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
        ssid="Your WiFi SSID"
        psk="Your WiFi Password"
        key_mgmt=WPA-PSK
}

The /etc/network/interfaces file should be the default version, and should look like this:

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# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto lo
iface lo inet loopback

iface eth0 inet manual

allow-hotplug wlan0
iface wlan0 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

allow-hotplug wlan1
iface wlan1 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

The Edimax 7811 tends to 'fall asleep' when not in use on the Pi, and this can lead to the kind of problems you describe in your original post. To prevent this, create the file:

Code: Select all

/etc/modprobe.d/8192cu.conf

with permissions:

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-rw-r--r-- 1 root root  86 Oct 17 16:00 8192cu.conf

containing the lines:

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# Disable Edimax 7811 WiFi Dongle power management
options 8192cu rtw_power_mgnt=0 rtw_enusbss=0

Hope this helps,

Dave.

[fabio199618]

Thanks a lot for your help Dave!

Unfortunately, there is a little problem.

I don't know how to set permissions.

I created the file using sudo nano /etc/modprobe.d/8192.conf

I wrote the lines you suggested, but nothing has happened...

Any advice?

[DirkS]

I created the file using sudo nano /etc/modprobe.d/8192.conf

I wrote the lines you suggested, but nothing has happened...

Any advice?

Reboot and wait to see if it solves your problem...

[dgordon42]

DirkS is right, reboot after making changes.

When you say

I wrote the lines you suggested, but nothing has happened...

what do you mean?
Does the blue LED in the Edimax 7811 stop flashing when you try to connect to a network, as you reported in your original post?

Can you confirm that you are using Raspbian Jessie by checking the contents of the /etc/os-release file.

Thanks,
Dave.

[fabio199618]

When i say "i wrote the lines you suggested, but nothing has happened" i mean I wrote

Code: Select all

# Disable Edimax 7811 WiFi Dongle power management
options 8192cu rtw_power_mgnt=0 rtw_enusbss=0

in that file, as you said, (after editing wpa_supplicant.conf and double-checking interfaces was in "default" state) then i did the reboot, but nothing particular happens. Usb still stops flashing. As it regards the Os, i'm pretty sure i'm using Jessie, because i downloaded it from the official site and burned it to my sd using win32 disk imager. The fact is that the adapter does its work perfectly if i'm trying to connect to a tethering router (e.g. my galaxy s2 used as a router) and if i use OpenElec, there is no problem.

Thanks for the patience, i'm really sorry to bother you all

[dgordon42]

@fabio199618'

Earlier in the thread you posted

Ethernet cable with that router works fine, phone used as a router also works well.

Disconnect the Ethernet cable, reboot, and try the WiFi.
Raspbian, by default, runs a daemon which prevents both wired and wireless networks running together.

Dave.

[fabio199618]

Okay, i know i have been probably a little confusionary, so i'll try to be more precise and i'll describe my situation in every possible detail, so please excuse me if i'll take too long.

1) I downloaded raspbian jessie from here and i wrote it in my 8gb sd card using win32 disk imager.

2) I started my Raspi with success and desktop loaded without problems: wifi adapter flashes one time per second.


3) I tried first time to insert password on my net and

4) Wifi adapter stops flashing and this happens: . Nothing!

5) I Open Browser and obviously it does not work

6) I try to connect using network management (wlan0) this way: and , however i get the same problem as before.

7) I try using Dave's fix i first run lsusb and uname-a in order to check everything is right

8) At this point, wifi adapter has stopped flashing every second and flashes every 7-8 seconds

9) Then i open wpa_supplicant.conf with nano and i start editing it

10) I rename this: into this: and i double-check internet/interfaces is in "standard" state: and

11) Reboot: Wifi adapter is flashing 1 time per second: however, internet still doesn't work.I go with the last part of the fix: power management.

12) I create the file using "touch" and i check permissions: all o-k.

13) I edit the file using nano , then save.

14) Another reboot: now the wi fi adapter doesn't even flash.

I DID NOT use Ethernet AND Wifi at the same time, i first tried using only ethernet, then only wi-fi. If i use ONLY ethernet, it works.
If i use ONLY Wifi, it doesn't work. If i turn my phone into a router via thethering, it works fine, if i use another OS, like openElec, for example, it works.

Hope this helps, and sorry for the inconveniet, but, as I said, i'm a total noob

[dgordon42]

I'm still looking at this but, I'm wondering if your WiFi password has got any odd characters, such as @#<>"'¬`, etc. in it. If it does, try temporarily changing it in your router to something simple, like 12345, enter the new password into wpa_supplicant.conf, as you have been doing, reboot, and see what happens.

I have never seen the two network error icons at the top right of your screen shots of the Pi's desktop, I'm trying to reproduce them on my Pi at the moment.
I can confirm that an incorrect WiFi password will cause the Edimax blue LED to stop flashing after if fails to connect.

Dave.

[DougieLawson]

Open an LXterminal window

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
Check in there that you've got your WiFi SSID and psk correct.

If your network doesn't use WPA/WPA2 security then you have some extra stuff to do.

[fabio199618]

My router password doesn't have any particular characters, just numbers, and i can assure i typed those characters right!

I checked password 4 times!

[fabio199618]

Open an LXterminal window

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
Check in there that you've got your WiFi SSID and psk correct.

If your network doesn't use WPA/WPA2 security then you have some extra stuff to do.

Good afternoon and thanks for the advice!

My network uses WEP security, what's the extra stuff i need to do?

[fruitoftheloom]

Open an LXterminal window

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
Check in there that you've got your WiFi SSID and psk correct.

If your network doesn't use WPA/WPA2 security then you have some extra stuff to do.

Good afternoon and thanks for the advice!

My network uses WEP security, what's the extra stuff i need to do?

Any reason for still using WEP ? WPA is far more secure and nowadays the de-facto standard in Home Routers

[fabio199618]

Open an LXterminal window

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
Check in there that you've got your WiFi SSID and psk correct.

If your network doesn't use WPA/WPA2 security then you have some extra stuff to do.

Good afternoon and thanks for the advice!

My network uses WEP security, what's the extra stuff i need to do?

Any reason for still using WEP ? WPA is far more secure and nowadays the de-facto standard in Home Routers

You are right, but I'm Italian, standards don't apply to us

[MrEngman]

Open an LXterminal window

sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
Check in there that you've got your WiFi SSID and psk correct.

If your network doesn't use WPA/WPA2 security then you have some extra stuff to do.

Good afternoon and thanks for the advice!

My network uses WEP security, what's the extra stuff i need to do?

Change file /etc/wpa_supplicant/wpa_supplicant.conf so it looks like

Code: Select all

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
       ssid="network-name"
       key_mgmt=NONE
       auth_alg=OPEN
       wep_key0=WEP-hex-key
}

WEP-hex-key is the 10 or 26 hex character key, depending on the version of WEP, with NO quotation marks around it.



MrEngman

[DougieLawson]

Any reason for still using WEP ? WPA is far more secure and nowadays the de-facto standard in Home Routers

You are right, but I'm Italian, standards don't apply to us

That's not true. The Italians were the reason I had to change my IBM passwords every ninety days when I worked for IBM United Kingdom Ltd. Due to your Government's half baked security standards (93 days would have been so much easier).

You can crack a WEP network in less than five minutes.

[fabio199618]

Thank you so much! Unfortunately it didn't work out...
I'm clueless...

[dgordon42]

When you say

Unfortunately it didn't work out...

I take it you are referring to @MrEngman's post of a sample wpa_supplicant.conf file above, suitable for use with WEP WiFi security.
If so, try changing the line

Code: Select all

 auth_alg=OPEN

in MrEngman's example to

Code: Select all

auth_alg=SHARED

Have you got anything else running on your WiFi?

Thanks,
Dave.

[Paulwood]

The problem seems to be power related. make sure you have a power supply which can more than 1.2 amps of current, and add "max_usb_current=1" to /boot/config.txt.
If you already did that, then describe your hardware, and software setup. Try Jessie lite, and see how it goes...

Thank you @Shea - I've been going crazy - I have a model A+ that was running fine using node-red. I had to upgrde becasue one of the nodes I was using (openweathermap) started requiring an API key which ment upgrading etc.

So I upgraded to Jessie lite and couldn't connect. If I used a hub, the WiFi dongle worked fine but in the Pi it would not connect. Same power supply, wifi dongle, SD card, and pi - the main thing that changed was I upgraded to Jessie.

Now, after adding "max_usb_current=1" to /boot/config.txt - it now works!

So my take is that Jessie has done something to effect the power to the usb port

----------------------
arugh - spoke too soon. Left it alone for a little bit and ssh got disconnected and now I'm getting a 'host is down' message. sigh...WiFi dongle blinks 11 times, 3 second break and it repeats.

pulled the wifi dongle (edimax) out, plugged in the powered usb hub, stuck the wifi dongle in it and everyghint works - without rebooting....sigh