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I'm trying a new post because the situation changed from my last one.

My wifi was not working at all a few days ago. After a suggestion was put forward, I attempted --reinstall linux-firmware and now have the following files:

ls /lib/firmware | grep 8000
iwlwifi-8000C-13.ucode
iwlwifi-8000C-16.ucode
iwlwifi-8000C-21.ucode
iwlwifi-8000C-27.ucode
iwlwifi-8000C-31.ucode
iwlwifi-8000C-34.ucode

As you can see I am still missing the -22, -23, and -24.ucodes. The Wifi option appears on the network pane, and it shows up during rfkill list. But I cannot see any available wifi networks, and it says 'Wifi disconnected' under the top-right network panel.

rfkill list
 0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no

sudo lshw -C network
  *-network               
   description: Wireless interface
   product: Wireless 8260
   vendor: Intel Corporation
   physical id: 0
   bus info: pci@0000:02:00.0
   logical name: wlp2s0
   version: 3a
   serial: 44:85:00:62:8f:b8
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
   configuration: broadcast=yes driver=iwlwifi driverversion=4.13.0-26-generic firmware=34.0.1 latency=0 link=no multicast=yes wireless=IEEE 802.11
   resources: irq:127 memory:df200000-df201fff

'rfkill list; dmesg | grep iwl' gives a very long line of code ending with: 

 [3428.012482] iwlwifi 0000:02:00.0: Scan failed! ret -110

My wifi worked in the 'test Ubuntu' part of setup before I fully installed the OS. I am running kernel 4.13. Please let me know if I can provide any more info.

user782156
  • 3

1 Answers1

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I suspect that the absence of the -22, -23 and -24 firmware blobs is insignificant. As the driver is updated, the firmware is also updated. Not every firmware works with every driver version.

You are already loading the -34 firmware, a very new version.

There are some other steps that I suggest you might check. 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:

sudo nano /etc/default/crda

Change the last line to read:

REGDOMAIN=IS

Proofread carefully, save and close the text editor.

Next, here is a post that suggests that the -31 firmware might work better: https://bugs.archlinux.org/task/51271 It is easy to try and easy to reverse if it isn’t helpful. We’ll rename the -34 so it doesn’t load and reboot so that the -31 loads and test:

cd /lib/firmware
sudo mv iwlwifi-8000C-34.ucode iwlwifi-8000C-34.bak

Reboot. Any improvement?

chili555
  • 61,440
  • Hey, this worked (mostly)! I can view all available wifi networks and connect to most of the networks I've tried so far. The few remaining must have some sort of internal conflicting parameters. Thank you! – user782156 Jan 16 '18 at 02:31
  • Awesome! If my answer has been helpful, please accept it: https://askubuntu.com/tour – chili555 Jan 16 '18 at 02:47