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I am trying to get my new installation of Ubuntu 18.04 on a Lenovo Yoga C930 up and functional. My wireless has been giving me issues since the beginning. Currently my question is:

How do I fix a slow wireless connection on my machine?

Here is the history of what I've done so far:

  1. The question here got my wireless from a Hard block to being unblocked.
  2. Then, by following the advice given here, I was able to determine that I have a iwlwifi driver which needs to be modified to select a different wireless antenna.

So my more specific question is, how can I tell my machine to use the correct wireless antenna to get full signal and speed?

If the answer includes the modprobe or modinfo commands, that would be nice since I've been reading up on how to use them, but for a driver that was inapplicable to my setup.

Pinkie B
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1 Answers1

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I own and use successfully two Intel wireless devices. I have honed a few techniques in several years and thousands of forum posts.

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 recommend 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.

chili555
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  • That's a lot of stuff I don't know how to do! How do I check the router settings? – Pinkie B Aug 29 '19 at 12:21
  • I guess, while I'm clarifying, what's a fixed channel and how do I view/set it? – Pinkie B Aug 29 '19 at 12:33
  • The router settings are found and changed by logging in to the administrative pages of the router. https://www.techadvisor.co.uk/cmsdata/features/3325316/router_wireless_settings-channel.png – chili555 Aug 29 '19 at 13:03
  • Cool. I don't know that I have access to those. Can I skip that step and try the next ones in your solution? – Pinkie B Aug 29 '19 at 13:03
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    `sudo iw reg get` returns a lot of info. Inside it is a line: `phy#0: (self-managed)` `country US: DFS-UNSET` I am in the US. Does that mean I don't have to change anything here? – Pinkie B Aug 29 '19 at 13:07
  • What does `cat /etc/default/crda` tell us? If it says: `REGDOMAIN=US` then you need make no change. If it says anything else, such as `REGDOMAIN= ` then please change it. – chili555 Aug 29 '19 at 13:49
  • It began as `REGDOMAIN=` and I have since updated it to `REGDOMAIN=US`. Performing a speedtest (Ookla) gave me 11mbps download and 1mpgs upload. I think that means my speed is back to normal. I have noticed no slowness, but my wireless signal shows only 2 bars even when I am sitting right next to the router. That leaves me as only 80% confident that I have solved my initial issue. – Pinkie B Aug 30 '19 at 14:49
  • Are both antenna wires actually connected? https://media.karousell.com/media/photos/products/2019/02/04/intel_9260_173_gbps_245ghz_2x2_ac_bluetooth_50_1549261682_90828b630_progressive Both *Main* and *Aux* in the linked image. – chili555 Aug 30 '19 at 15:29