0

A few weeks ago, I switched from Windows8 to Ubuntu 14.04.3 LTS on my Sasmung NP900X3E-K02DE.

Everything worked, except the WiFi. The problem was, that connecting to networks (home, work, hotspot and university) sometimes took up to 2 minutes, sometimes I could connect immediately and sometimes i couldn't connect at all. I had to switch WiFi off and back on or connect to another network, before it worked again.

So I tried various things to get rid of this problem, mainly I tried different drivers and settings ( like this: samsung-series-9-np900x3a-no-wifi-internet ). Unfortunately I can't remember everything I did.

Long story short: Since this morning, my WiFi adapter isn't found at all. There is no possibility to (de)activate it through UI, there are no wifi networks shown and I can't find wlan0 in terminal.

Here is a copy of my wireless-info.txt

I hope someone can help me.

Thanks in advance, Fitzi.

Community
  • 1
Fitzi
  • 111

1 Answers1

0

First, it appears that you have loaded the wrong driver. Let's remove it:

sudo apt-get purge bcmwl-kernel-source

Also, in the version of iwlwifi that is included in kernel version 3.19-xx, there is a great deal more in the file iwlwifi.conf. Apparently, it has been overwritten. Please do:

gksudo gedit /etc/modprobe.d/iwlwifi.conf

Use nano or kate or leafpad if you don't have the text editor gedit. Amend the file to read:

# /etc/modprobe.d/iwlwifi.conf
# iwlwifi will dyamically load either iwldvm or iwlmvm depending on the
# microcode file installed on the system.  When removing iwlwifi, first
# remove the iwl?vm module and then iwlwifi.
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs     /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
options iwlwifi 11n_disable=8

I doubt that you need the other options. Proofread carefully, save and close the text editor.

Next, check the settings in the router. WPA2-AES is preferred; not any WPA and WPA2 mixed mode and certainly not TKIP. Second, if your router is capable of N speeds, you may have better connectivity with a channel width of 20 MHz in the 2.4 GHz band instead of automatic 20/40 MHz, although it is likely to affect N speeds. I also have better luck with a fixed channel, either 1, 6 or 11, rather than automatic channel selection. Also, be certain the router is not set to use N speeds only; auto B, G and N is preferred. After making these changes, reboot the router.

Next, I recommend that your regulatory domain be set explicitly. Check yours:

sudo iw reg get

If you get 00, that is a one-size-maybe-fits-all setting. Find yours here: http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 Then set it temporarily:

sudo iw reg set IS

Of course, substitute your country code if not Iceland. Set it permanently:

gksudo gedit /etc/default/crda

Change the last line to read:

REGDOMAIN=IS

Proofread carefully, save and close the text editor.

Next, I'd set IPv6 to Ignore in Network Manager: http://docs.fedoraproject.org/en-US/Fedora/18/html/Installation_Guide/images/netconfig/network-connections-ipv6-ignore.png This example is for ethernet, but you want wireless.

I notice in your paste that there are at least four access points with the same name. I suspect that the dropping may be because your wireless card is roaming from among them. I suggest you ask Network Manager to bind to the strongest one as described here: Ubuntu connect drops. Worked for a while then started dropping again

Community
  • 1
chili555
  • 61,330