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Wifi connection was weak and would disconnect often so I followed the steps at link1. The issue was not solved so I tried link2. Unfortunately this time wifi does not work at all..Ethernet works just fine. All I know is linux kernel got updated after I tried link2 from 3.19.0-25.26 to 3.19.0-42.48

Wireless info script output is here

Need help to get the network card working. Thanks in advance!

Edit:

modinfo rtl8723be

filename:       /lib/modules/3.19.0-42-
generic/updates/dkms/rtl8723be.ko
firmware:       rtlwifi/rtl8723befw.bin
description:    Realtek 8723BE 802.11n PCI wireless
license:        GPL
author:         Realtek WlanFAE <wlanfae@realtek.com>
author:         PageHe  <page_he@realsil.com.cn>
srcversion:     1A35907BCCEF84FE28F988D
alias:          pci:v000010ECd0000B723sv*sd*bc*sc*i*
depends:        rtlwifi,rtl_pci,btcoexist,mac80211
vermagic:       3.19.0-42-generic SMP mod_unload modversions 
parm:           swlps:bool
parm:           swenc:using hardware crypto (default 0 [hardware])
 (bool)
parm:           ips:using no link power save (default 1 is open)
 (bool)
parm:           fwlps:using linked fw control power save (default 1 is open)
 (bool)
parm:           msi:Set to 1 to use MSI interrupts mode (default 0)
 (bool)
parm:           debug:Set debug level (0-5) (default 0) (int)
parm:           disable_watchdog:Set to 1 to disable the watchdog (default 0)
 (bool)

sudo modprobe -r rtlwifi && sudo modprobe rtl8723be || sudo dmesg | tail -n 20

modprobe: FATAL: Module rtlwifi is in use.
[ 8016.688908] vgaarb: this pci device is not a vga device
[ 8042.309402] atkbd serio0: Unknown key pressed (translated set 2, code 0xd8 on isa0060/serio0).
[ 8042.309407] atkbd serio0: Use 'setkeycodes e058 <keycode>' to make it known.
[ 8042.317523] atkbd serio0: Unknown key released (translated set 2, code 0xd8 on isa0060/serio0).
[ 8042.317531] atkbd serio0: Use 'setkeycodes e058 <keycode>' to make it known.
[ 8042.594891] i915_bpo 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 8042.595060] i915_bpo 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 8042.601010] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master control interrupt lied (SDE)!
[ 8042.706421] vgaarb: this pci device is not a vga device
[13220.548635] atkbd serio0: Unknown key pressed (translated set 2, code 0xd7 on isa0060/serio0).
[13220.548645] atkbd serio0: Use 'setkeycodes e057 <keycode>' to make it known.
[13220.556650] atkbd serio0: Unknown key released (translated set 2, code 0xd7 on isa0060/serio0).
[13220.556663] atkbd serio0: Use 'setkeycodes e057 <keycode>' to make it known.
[13220.608543] i915_bpo 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[13220.608666] i915_bpo 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[13220.779499] vgaarb: this pci device is not a vga device
[13531.306668] vgaarb: this pci device is not a vga device
[13688.660608] vgaarb: this pci device is not a vga device
[14147.339430] vgaarb: this pci device is not a vga device
[14531.406230] vgaarb: this pci device is not a vga device

uname -r

3.19.0-42-generic

sudo lshw -C network

*-network UNCLAIMED     
   description: Network controller
   product: RTL8723BE PCIe Wireless Network Adapter
   vendor: Realtek Semiconductor Co., Ltd.
   physical id: 0
   bus info: pci@0000:08:00.0
   version: 00
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress cap_list
   configuration: latency=0
   resources: ioport:5000(size=256) memory:c6100000-c6103fff
  *-network
       description: Ethernet interface
       product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:09:00.0
       logical name: eth0
       version: 0a
       serial: 3c:a8:2a:bc:2a:8e
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8107e-2_0.0.2 02/26/15 ip=192.168.5.2 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       resources: irq:49 ioport:4000(size=256) memory:c6004000-c6004fff memory:c6000000-c6003fff

Edit 2:

sudo initctl stop network-manager

sudo modprobe -r rtlwifi && sudo modprobe rtl8723be || sudo dmesg | tail -n 20

zaman@zaman-Notebook:~$ sudo initctl stop network-manager
[sudo] password for zaman: 
network-manager stop/waiting
zaman@zaman-Notebook:~$ sudo modprobe -r rtlwifi && sudo modprobe rtl8723be || sudo dmesg | tail -n 20
modprobe: FATAL: Module rtlwifi is in use.
[ 2053.932069] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 2053.985389] atkbd serio0: Unknown key released (translated set 2, code 0xab on isa0060/serio0).
[ 2053.985393] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 2054.084680] atkbd serio0: Unknown key pressed (translated set 2, code 0xab on isa0060/serio0).
[ 2054.084685] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 2054.132757] atkbd serio0: Unknown key released (translated set 2, code 0xab on isa0060/serio0).
[ 2054.132762] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 2054.230363] atkbd serio0: Unknown key pressed (translated set 2, code 0xab on isa0060/serio0).
[ 2054.230367] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 2054.272300] atkbd serio0: Unknown key released (translated set 2, code 0xab on isa0060/serio0).
[ 2054.272304] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 2054.538206] atkbd serio0: Unknown key pressed (translated set 2, code 0xab on isa0060/serio0).
[ 2054.538210] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 2054.613514] atkbd serio0: Unknown key released (translated set 2, code 0xab on isa0060/serio0).
[ 2054.613518] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 2054.890514] atkbd serio0: Unknown key pressed (translated set 2, code 0xab on isa0060/serio0).
[ 2054.890517] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 2054.994063] atkbd serio0: Unknown key released (translated set 2, code 0xab on isa0060/serio0).
[ 2054.994068] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 2171.306785] systemd-hostnamed[3531]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!

lsmod |grep rtl

zaman@zaman-Notebook:~$ lsmod |grep rtl
rtl8723be              90112  0 
btcoexist              53248  1 rtl8723be
rtl8723_common         24576  1 rtl8723be
rtl_pci                28672  1 rtl8723be
rtlwifi                73728  2 rtl_pci,rtl8723be
mac80211              708608  3 rtl_pci,rtlwifi,rtl8723be
cfg80211              524288  2 mac80211,rtlwifi

zaman@zaman-Notebook:~$ modprobe -r rtlwifi
modprobe: FATAL: Module rtlwifi is in use.
zaman@zaman-Notebook:~$ ifconfig wlan0 down
SIOCSIFFLAGS: Operation not permitted

Update:

I booted to my earlier kernel version 3.19.0-25 instead of the latest 3.19.0-42 and the wifi seems to be working! It is unstable though!

Questions:

  1. I want to remove the latest kernel where I had the driver issues since I no longer need it, how do I do that?

  2. The wifi is unstable and keeps disconnecting as I move away from the router, any fix for this?

Community
  • 1
silent_monk
  • 31
  • The kernel log (lines 327f of http://pastebin.ubuntu.com/14230656/) points to a kernel module mismatching your kernel version. Which driver source (from which answer of the linked questions) were you using while running the Wifi diagnostics and did you (re-)compile the driver for the current kernel? – David Foerster Dec 27 '15 at 15:21
  • @DavidFoerster : I followed the links in the same order, the wireless script was run after the steps in [link] (http://askubuntu.com/questions/645220/unable-to-connect-wifi-ubuntu-14-04-lts-hp-pavilion-network-driver-rtl8723be/645238#645238) I did not compile the driver for the current kernel as the last step said "reboot" – silent_monk Dec 27 '15 at 16:45
  • What's the output of modinfo rtl8723be? It also looks like that module isn't loaded in favour of rtlwifi. What happens, when you run sudo modprobe -r rtlwifi && sudo modprobe rtl8723be || sudo dmesg | tail -n 20? – David Foerster Dec 28 '15 at 13:13
  • Attaching the results in images as I am not sure what happened there..img1 and img2 . Does it mean anything to you? – silent_monk Dec 30 '15 at 15:15
  • Please [edit] your question, when you want to add information and use text instead not images to represent text. Especially file or program output listings (with the help of the {} button in the editor toolbar) are much more readable there and overall it's best to have everything relevant in one place. Also, comments may be deleted for various reasons. – David Foerster Dec 31 '15 at 00:36
  • That didn't work as expected. Please disable Wifi and repeat the last set of commands again please. What's the output of uname -r? – David Foerster Dec 31 '15 at 00:38
  • @DavidFoerster : Sorry but I am unable to disable wifi. The wireless networking option itself is missing! Any commands to disable it? – silent_monk Jan 03 '16 at 18:05
  • If everything else fails, you can stop NetworkManager to bring down all networks including wifi: sudo initctl stop network-manager – David Foerster Jan 04 '16 at 09:01
  • @DavidFoerster : Tried that, ethernet went down..okay! but rtlwifi is still in use (code listing at edit 2)! Weird! – silent_monk Jan 04 '16 at 15:21
  • I'd suggest you to remove all drivers related to your wifi card and re-install from scratch. Follow this topic as it is the same device: http://askubuntu.com/questions/590414/wifi-problems-with-rtl8723be-in-ubuntu-14-04 and if any issues pls provide the result so we can assist where the problem stays. – ostendali Jan 04 '16 at 17:41
  • @ostendali : thanks much! I did not know how to remove the drivers but tried booting in earlier kernel (added an update to the post). wifi is back now but unstable. Could you help with the questions? – silent_monk Jan 05 '16 at 15:27
  • for the first question all you have to do is to open ubuntu sofware center and look for kernel (called linux-image-x.xx.x-xx) first check in terminal with "uname -r" to find out the kernel you are using so you make sure you don't remove that one, any kernel greater than the one you are using you can remove. About your wifi being unstable, I am not sure how far you go away from the router, that depends on expansion of your signal. However, just to make sure you don't have multiple modules loaded post the result of "lsmod |grep rtl" – ostendali Jan 05 '16 at 15:52
  • @ostendali : updated the result above. The signal drops surely if I move to another room than the one with the router, but it also weakens in the same room with just 2m away..! – silent_monk Jan 05 '16 at 16:10
  • the modules are OK so far, what happens if you try to remove "modprobe -r rtlwifi" see if without the wifi is still working. if you get an error during removal just put the wifi interface down (i.e. ifconfig wlan0 down or whatever is your interface) – ostendali Jan 05 '16 at 17:10
  • @ostendali: that did not seem to work..! the wifi issue is not there in windows 10, just with the ubuntu rtl8723be driver. – silent_monk Jan 05 '16 at 17:24
  • The easiest solution is to explained here: http://askubuntu.com/a/743467/11223 – Marcello Nuccio Apr 08 '16 at 18:03
  • 1
    Possible duplicate of Realtek 8723BE Wifi problem – Pilot6 Jul 28 '16 at 12:02

1 Answers1

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Hello,

I have the same wireless card, and I had problems with wifi after updates as well.

Establish a temporary internet connection (with ethernet cable), open up a terminal and try these commands.

sudo apt-get install build-essential git
git clone https://github.com/lwfinger/rtlwifi_new/
cd rtlwifi_new
make
sudo make install

After doing this, reboot and your wifi should be working.

When this does not fix your problem, try this:

Go to BIOS and disable secure boot!

Maybe your system is not allowing your wireless card.

Hope I helped! -orion-

Zanna
  • 70,465
  • Thank you. It solves my problem even after these years. What I don't understand is that the wifi connection drops every few weeks and then I have to repeat these steps all over again to ensure connectivity. Anyone else have this issue or was it a one time fix? – silent_monk Oct 04 '18 at 03:49