9

Yesterday I bought new laptop Lenovo E540 and I installed here Ubuntu 14.04.2. But I've problem with my wifi (router is Dlink g version). I can connect to wifi without problems after turning on laptop. But then (after some time of work) suddenly my connection is lost, but network-manager is still signalizing that I'm connect but I can't even ping anything. When I try to reconnect via manager to my network it's looking like it's trying to connect but it will never do... I have to reboot and then everything is again correct until it will close connection again. I was searching net, but unfortunatily without luck. I tried to comment dns=dnsmasq in /etc/NetworkManager/NetworkManager.conf, but nothing happen.

on Jeremy31 suggestion here is a result of 

lspci -nnk | grep -iA2 net
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
    Subsystem: Lenovo Device [17aa:5028]
    Kernel driver in use: r8169
04:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
    Subsystem: Lenovo Device [17aa:b728]
    Kernel driver in use: rtl8723be

when I used grep network-manager over syslog I found there some errors:

Mar 14 22:40:03 dano-lenovo NetworkManager[784]:  error requesting auth for org.freedesktop.NetworkManager.wifi.share.protected: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get UID of name ':1.23': no such name

but I think it's problem that I can't reconnect, but why this happend I'm not sure..

last logs before error are:

NetworkManager[784]:  (wlan0): IP6 addrconf timed out or failed.
Mar 14 22:38:31 dano-lenovo NetworkManager[784]:  Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
Mar 14 22:38:31 dano-lenovo NetworkManager[784]:  Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) started...
Mar 14 22:38:31 dano-lenovo NetworkManager[784]:  Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) complete.
Mar 14 22:38:31 dano-lenovo wpa_supplicant[909]: wlan0: CTRL-EVENT-SCAN-STARTED

Tnaks for help

DaMi
  • 91

4 Answers4

7

you can try one of the below solution:

Open terminal and type in: sudo service network-manager restart.
OR
Go to System Setting -> Network -> Forget your wifi and reconnect to it.
OR
Restart or Log off and Log into your laptop.

Tejus Prasad
  • 200
4

My new Dell Inspiron laptop had the same issue: WiFi would work for a few minutes, then stop working. Adding 

options rtl8723be fwlps=N ips=N

to /etc/modprobe.d/rtl8723be.conf fixed the problem.

But then I saw How do I get a Realtek RTL8723BE wireless card to work? which seems a more definitive approach. So I did that instead (removing rtl8723be.conf as well), and that worked as well.

I'm a little uneasy using this "unapproved" WiFi driver, but it does seem to work.

Community
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Rujith de Silva
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0

Did you change settings on Firewall?
If yes then change the setting for OUTCOMING to ALLOW as you can see on the image:

enter image description here

Gryu
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Soteris 92
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0

This will install backported modules from the 3.19 kernel and it works well

sudo apt-get install linux-headers-generic build-essential
wget https://www.kernel.org/pub/linux/kernel/projects/backports/stable/v3.19-rc1/backports-3.19-rc1-1.tar.gz
tar -zxvf backports-3.19-rc1-1.tar.gz
cd backports-3.19-rc1-1
make defconfig-rtlwifi
make
sudo make install

echo "options rtl8723be fwlps=N ips=N" | sudo tee /etc/modprobe.d/rtl8723be.conf Reboot

If you update and get a new kernel you need to do the following

cd backports-3.19-rc1-1
make clean
make defconfig-rtlwifi
make
sudo make install

EDIT: after seeing the wireless-info, I would change the encryption to WPA2 only with no TKIP

After changing encryption, if you want to try it without the backports cd ~/backports-3.19-rc1-1 and then sudo make uninstall reboot and if you feel it works better with the backports cd ~/backports-3.19-rc1-1 and sudo make install

Jeremy31
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