pi zero w wifi gone after power cycle

[midol]

Raspbian up to date, wifi fine when using it one day. Orderly shutdown and no wifi the next day on power up. eth0 fine but ifconfig shows no wlan0. The unit has been configured according to these instructions - https://www.raspberrypi.org/documentati ... -point.md
up to the end of the section labelled Add routing and masquerade I only want remote access to the pi at this point.

Does the wifi show up in a startup log file? I can't see any mention of it in dmesg. Test? other log files? Suggestions welcome.

Dave

[DougieLawson]

There's no ethernet on a Zero only WiFi so your post doesn't make sense.

[midol]

yes the eth0 is on a plugin to the usb OTG port

[DougieLawson]

Get a fresh SDCard and a fresh copy of plain Raspbian (NOT NOOBS), write that to the fresh SDCard with Etcher.

Write /boot/ssh (a blank zero length file is all you need) and /boot/wpa_supplicant.conf on that new SDCard so that SSH and the WiFi work on first boot.

wpa_supplicant.conf

Code: Select all

country=GB
update_config=1
ctrl_interface=/var/run/wpa_supplicant

network={
 scan_ssid=1
 ssid="MyNetworkSSID"
 psk="mySecurePassword"
}

Boot that, does the WiFi work?
Run sudo apt update; sudo apt dist-upgrade -y to get the latest kernel and bootcode, does that work?

[midol]

excellent, thanks very much, I'll let you know.

Dave

[midol]

I know it has taken a long time, but anyway no joy.

Code: Select all

pi@raspberrypi:~ $ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.122  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::b497:b105:527f:38f2  prefixlen 64  scopeid 0x20<link>
        ether 00:e0:4c:53:44:58  txqueuelen 1000  (Ethernet)
        RX packets 82  bytes 8146 (7.9 KiB)
        RX errors 1  dropped 1  overruns 0  frame 2
        TX packets 73  bytes 10996 (10.7 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether b8:27:eb:94:40:d8  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

and

Code: Select all

pi@raspberrypi:~ $ dmesg | grep wlan0
[   30.588933] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready

further ideas?

d

[kerry_s]

have you tried just using "sudo raspi-config" -> network options-> wifi

[midol]

got these:

Failed to set SSID or passphrase
There was an error running option N2 Wireless LAN

good idea though. any others? don't know which logfiles might be informative, ideas?

D