By sugarraysam

2016-02-11 19:44:05 8 Comments

I've been having problems with my wifi connection (rtl8821ae driver). I can stay connected for hours (as long as 6 hours) and then sometimes it just crashes and doesn't work on reboot...have to wait until the next day.

[email protected]:~$ uname -v
#1 SMP Debian 3.16.7-ckt20-1+deb8u3 (2016-01-17)

[email protected]:~$ lspci -vnn | grep Network
04:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. 
RTL8821AE 802.11ac PCIe Wireless Network Adapter [10ec:8821]

[email protected]:~$ sudo iwconfig
eth0      no wireless extensions.

wlan0     IEEE 802.11abgn  ESSID:"Bravotelecom_9947"  
  Mode:Managed  Frequency:2.462 GHz  Access Point:     E8:CC:18:F7:81:50   
  Bit Rate=6.5 Mb/s   Tx-Power=20 dBm   
  Retry short limit:7   RTS thr=2347 B   Fragment thr:off
  Encryption key:off
  Power Management:off
  Link Quality=70/70  Signal level=-24 dBm  
  Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
  Tx excessive retries:0  Invalid misc:1   Missed beacon:0

lo        no wireless extensions.

I've tried to enable power management and then turn it off (even though it shows it is already turned off):

[email protected]:~$ sudo modprobe rtl8821ae swlps=1
[email protected]:~$ sudo iwconfig wlan0 power off
Error for wireless request "Set Power Management" (8B2C) :
SET failed on device wlan0 ; Operation not supported.

But I keep getting this error...anyway I don't think this is the problem.

I've also tried:

rfkill unblock -all

But nothing was soft or hard blocked to start with so no differences. My router is configured for IPv4 (not IPv6), and supports channels in 2 GHz and 5 GHz band. I have noticed that my Network Adapter switches between these two frequencies...sometimes I'm connected with low band and other times high band.

I will post the journalctl entries next time it crashes bcuz I don't have them right now.

Thanks for helping.


@GAD3R 2016-02-11 20:47:55

Add a "non-free" component to /etc/apt/sources.list :

# Debian 8 "Jessie"

Update the list of available packages and install the firmware-realtek package:

sudo apt-get update && apt-get install firmware-realtek

and install build essential:

sudo apt-get install build-essential linux-headers-generic linux-headers-`uname -r`

load module

  sudo modprobe rtl8821ae

install wpa_supplicant

aptitude install wpasupplicant

edit /etc/wpa_supplicant.conf

nano  /etc/wpa_supplicant.conf

Setup wlan0 with the SSID and PSK as follows:

auto wlan0
iface wlan0 inet dhcp
     wpa-ssid YOUR-SSID-HERE

save and exit

type the following command ;

ifup wlan0

restart the networking service using any one of the following method:

/etc/init.d/networking restart

Once connected, start dhclient to obtain a dynamic IP adress.

dhclient wlan0

@Giovanni Toraldo 2017-03-04 09:39:58

so the problem is network-manager?

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