1

I used Windows but uninstalled it, and installed Ubuntu 16.04. Now I have a big problem: My WiFi stopped working. I tried everything I could find, and still no WiFi. for 10 days.

My machine is :

  • Acer Aspire V13 / V3-371-55PF
  • CPU Intel Core i5-4210U 1.7 GHz with Turbo Boost ut to 2.7 GHz
  • Network controller: Qualcomm Atheros AR9462 Wireless Network Adaptor (rev 01)
  • Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
Sumeet Deshmukh
  • 9,296
Angel Trifonov
  • 11
  • 2

2 Answers2

1

First, 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

Use nano or kate or leafpad if you don't have the text editor gedit.

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.

If these changes do not help, please try:

sudo modprobe -r ath9k
sudo modprobe ath9k nohwcrypt=1

If it helps, make it permanent:

sudo -i
echo "options ath9k nohwcrypt=1"  >>  /etc/modprobe.d/ath9k.conf
exit
chili555
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0

I've got the same laptop running ubuntu gnome 16.04, the wifi would connect to my home network but be completely unusable. Within seconds of connecting I'd be getting 70-90% packet loss with pings in the 1000's ms, often dropping from that to timeouts and something like a buffer error.

The fix for me was disabling the 802.11'n' features on the card, the issue stopped straight away and the wifi hasn't had an issue for weeks now.

I believe this was the post I got it from, the iwlwifi part halfway down. How do I keep my Wifi from dropping out? - Ask Ubuntu

Jeff
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