Wireless LAN not working properly.

[iffuw]

Hi,

i've just installed Linux Mint 18.3 and everything seems to be working quite smoothly.
Unfortunately my wireless lan does not work.
I can see the wireless networks around me, but when i try to connect to my own network (password is saved correctly)
I'm unable to connect. The "wait" circle is showing and after a few seconds the message "not connected to network" pops up.
I have a TP-Link TL-WN851N 300Mbps Wireless N PCI Adapter.
When i run "lspci" i can read:
04:07.0 Network controller: Qualcomm Atheros AR9227 Wireless Network Adapter (rev 01).
I am running on the kernel: 4.13.0-36-generic.

I have also tried another wlan adapter I have at home, a ASUS PCE-AC51. I've observed exactly the same issue there.

Please, can anyone help me out? I can surely provide additional info if needed.

Btw.: Im running a dual boot with windows 10 here, and there the wireless network works just fine for both adapters.

[JeremyB]

See the wireless script link in my signature and post results

[iffuw]

Thanks for the quick answer. Here is the info file.

[JeremyB]

I would see if the following helps

Code: Select all

sudo iw reg set DE

Code: Select all

sudo iwconfig wlp4s7 txpower 18

Change IPv6 setting in Network Manager for wifi to ignore/disable, then try to connect. You do have one wifi access point using WPA with TKIP, when WPA2 with AES/CCMP is preferred

[iffuw]

Hi,

thanks again for the quick reply.
I did what you told me, at first ran "sudo iw reg set DE", and after that "sudo iwconfig wlp4s7 txpower 18".
After that i went to "network" in the system settings and disabled IPv6 for my home wireless network.
Unfortunately the result was the same. The loading symbol shows up next to the network, and after a few seconds the "network disconnected" pops up.
I ran your infoscript after the changes from above again an attached it, maybe that helps.

Do you think it would help, if i installed the system again natively in german? I'm just guessing bearing your the first command (set DE) in mind.

Furthermore if i run "dmesg | grep wlp4s7" i repeatedly get the following lines:
[ 1028.909079] wlp4s7: authenticate with 88:03:55:8d:10:d6
[ 1028.940899] wlp4s7: send auth to 88:03:55:8d:10:d6 (try 1/3)
[ 1029.018341] wlp4s7: send auth to 88:03:55:8d:10:d6 (try 2/3)
[ 1029.068034] wlp4s7: send auth to 88:03:55:8d:10:d6 (try 3/3)
[ 1029.119633] wlp4s7: authentication with 88:03:55:8d:10:d6 timed out
maybe that helps...

[JeremyB]

Try with ethernet disconnected as the TX power is good now

[iffuw]

Hi,
sorry, exactly the same, when the ethernet cable is not plugged in.

[iffuw]

Hey, i got the solution via another issue (not all my usb ports were working).

The solution was:
- enable XHCI hands-off
- enable EHCI hands-off
- endable IOMMU controller
all in the UEFI.
Furthermore:
in /etc/default/grub
Add the line:
GRUB_CMDLINE_LINUX="iommu=soft"
Save, rebuild grub config with
sudo update-grub.

No everything works fine!
Tanks again!