[SOLVED] Wifi connection not working after latest updates to current.

rsamurti · 11-12-2021, 10:47 PM

Hello,

After applying updates wifi connections are not working. Any clues to correct this?

Thank you for your support.

Anand

kgha · 11-13-2021, 02:16 AM

Some more information is needed. Which slackware version (14.2 or current, 32 or 64 bit)? Date for your previous upgrade?

rsamurti · 11-13-2021, 04:08 AM

Slackware64 Current. All updates applied till Nov 11 2021.

LuckyCyborg · 11-13-2021, 04:22 AM

Quote:

Originally Posted by rsamurti

Hello,

After applying updates wifi connections are not working. Any clues to correct this?

Thank you for your support.

Anand

Only if you give any clues about what hardware we talk...

My surname is not Nostradamus, so I am not able to guess accurately your device model.

igadoter · 11-13-2021, 04:52 AM

You need to disable networkmanager. Then do some standard diagnostic. Use ifconfig to rise up interface. Then use iw toools: iwconfig, iwlist. If this fails it means kernel issue. Probably missed kernel module. If scanning network will show access points, then it is networkmanager issue.

Make sure WiFi is not hardware locked.

Edit: I forgot to add that sometimes wpa_supplicant fails. Which the worst scenario.

rsamurti · 11-13-2021, 05:35 AM

Disabled Network Manager.

ifconfig -a gave this output related to the wireless device:

wlan0: flags=4098 ....

This shows that wlan0 is up.

Now what should I check?

igadoter · 11-13-2021, 06:43 AM

Quote:

Originally Posted by rsamurti

Disabled Network Manager.

ifconfig -a gave this output related to the wireless device:

wlan0: flags=4098 ....

This shows that wlan0 is up.

Now what should I check?

I am now on my tablet. Basically these are two commands,

Code:

# iwconfig wlan0
# iwlist wlan0 scanning

verify with synopsis, say iwconfig --help tells basic usage. If these commands work, next stage is to verify wpa_supplicant. For this you need to set /etc/wpa_supplicant.conf. File contains essid of your network and hashed passphrase. If file does not exist create it with wpa_passphrase command

Code:

# wpa_passphrase essid passphrase > /etc/wpa_supplicant.conf

then run

Code:

# wpa_supplicant -Dwext -i wlan0 -c /etc/wpa_supplicant.conf

output tells about successful association. You can also verify association with iwconfig.
The last thing is to run dhcpcd to obtain local address

Code:

# dhcpcd wlan0

if this works, you obtain your internet connection, then networkmanager is source of your problems.

rsamurti · 11-13-2021, 11:03 AM

When I give the command

ifconfig wlan0

I get this output:

wlan0 unassociated ESSID:"" ...

This means that wlan0 is not associated with with my ESSID.

iwlist wlan0 scanning

gives the output:

wlan0 No scan results

But I am able to connect to the same ESSID through my cellphone.

igadoter · 11-13-2021, 11:29 AM

First of all I need to see terminal output. Just copy and paste terminal output use tags.
So show me this

Code:

 
# ifconfig

and output of these commands

Code:

# pgrep wpa
# pgrep dhcp

I stop to try to help you if you will not provide exact output of command as you see it in terminal. Don't make me to think you are just troll. Here what is on my computer

Code:

bash-5.1# pgrep wpa
1217
bash-5.1# pgrep dhcp
1293
1295
1296
1303
1314

as you see crazy networkmanager spawned plenty of dhcpcd clients. But I am running very old -current. Perhaps new update fixes this. Dunno.

igadoter · 11-13-2021, 11:36 AM

Quote:

Originally Posted by rsamurti

When I give the command

ifconfig wlan0

I get this output:

wlan0 unassociated ESSID:"" ...

I asked for

Code:

#  iwconfig  wlan0

I don't think it is important but to be sure device is not locked

Code:

# rfkill list

rsamurti · 11-13-2021, 04:14 PM

I am unable to send screen shot of output s of commands in the terminal as I am connected to this forum only through my cellphone.

LuckyCyborg · 11-13-2021, 04:39 PM

OP, about what hardware we talk?

What model and make is your WiFi device? I ask this because there could be a (kernel) driver issue.

BTW, I doubt that all your messing with the network stack has a usefulness, because quite probably is the driver - after all, we just switched to a LTS kernel, kernels which are famous about having issues in the initial releases.

PS. You can go USB tethering from your smartphone until you bring up your WiFi.

NightSky · 11-14-2021, 03:20 PM

@LuckyCyborg @rsamurti my wifi disconnects and goes on and off sporadically like blinking after I click on the connect button on current64 too what is the command to pull up hardware profile, if forget. fyi (connects on other devices in house are stable).

@rsmauriti had same problem without direct access to forum: do you working in terminal on pc and copy to usb to connect to cellphone then copy to post (I know its a pain)

RadicalDreamer · 11-14-2021, 03:53 PM

Use this to find your wireless device model:

Code:

bash-5.1# lspci

Did you use slackpkg to update and applied/checked the new configs?

Code:

bash-5.1# slackpkg new-config

Quote:

n/network-scripts-15.0-noarch-17.txz: Rebuilt.
Merged changes in rc.inet1 to make it compatible with LXC containers.
Patched netconfig to ensure the proper permissions on rc.networkmanager
when NetworkManager is not chosen.

http://www.slackware.com/changelog/c...php?cpu=x86_64

rsamurti · 11-15-2021, 06:44 AM

Please excuse all of you for sparing your time to help me. After a lot of testing I found that the WiFi adapter had become defective. After replacing this with a new Tp-Link AC600 Archer T2U Plus adapter, I had to compile the kernel module for it as per instructions given here:

https://github.com/aircrack-ng/rtl8812au

After installing the kernel module for the device RTL8821AU, now the wifi connection is working fine.