Re: Can't connect to a 5GHz WiFi network

[Sadeep Madurange <sadeep@xxxxxxxxxxx>]

Hi Jaron,

On 2023-11-16 08:35:41, Jaron Kent-Dobias wrote:
> I recommend checking that the regulatory domain of your laptop matches
> that of the hotspot. When they don't match, the hotspot can advertise
> on channels that are disabled on the laptop.
> 
> The wiki has a note about this, as well as how to set it:
> https://wiki.archlinux.org/title/Network_configuration/Wireless#Respecting_the_regulatory_domain

Thanks for the advice. Following the relevant section in the Wiki, I
installed wireless-regdb, did the reboot, uncommented regdomain for my
location. However, I still can't connect to the AP.  Please let me know
if I missed something.

However, running iw list | grep -A 15 Frequencies: on my T490 (which is
the machine giving me the problem), I see the following output where
5GHz channels as disabled:

		Frequencies:
			* 2412 MHz [1] (22.0 dBm)
			* 2417 MHz [2] (22.0 dBm)
			* 2422 MHz [3] (22.0 dBm)
			* 2427 MHz [4] (22.0 dBm)
			* 2432 MHz [5] (22.0 dBm)
			* 2437 MHz [6] (22.0 dBm)
			* 2442 MHz [7] (22.0 dBm)
			* 2447 MHz [8] (22.0 dBm)
			* 2452 MHz [9] (22.0 dBm)
			* 2457 MHz [10] (22.0 dBm)
			* 2462 MHz [11] (22.0 dBm)
			* 2467 MHz [12] (22.0 dBm)
			* 2472 MHz [13] (22.0 dBm)
			* 2484 MHz [14] (disabled)
	Band 2:
--
		Frequencies:
			* 5180 MHz [36] (disabled)
			* 5200 MHz [40] (disabled)
			* 5220 MHz [44] (disabled)
			* 5240 MHz [48] (disabled)
			* 5260 MHz [52] (disabled)
			* 5280 MHz [56] (disabled)
			* 5300 MHz [60] (disabled)
			* 5320 MHz [64] (disabled)
			* 5340 MHz [68] (disabled)
			* 5360 MHz [72] (disabled)
			* 5380 MHz [76] (disabled)
			* 5400 MHz [80] (disabled)
			* 5420 MHz [84] (disabled)
			* 5440 MHz [88] (disabled)
			* 5460 MHz [92] (disabled)

Whereas when I run the same command on the ThinkPad X1, which connects
to 5GHz AP (gcat), I see the following output, where some 5GHz channels
are not disabled (reg domain is global, country 00 - this was the same
for T490 before I changed it using wireless-regdb).

                Frequencies:
                        * 2412 MHz [1] (22.0 dBm)
                        * 2417 MHz [2] (22.0 dBm)
                        * 2422 MHz [3] (22.0 dBm)
                        * 2427 MHz [4] (22.0 dBm)
                        * 2432 MHz [5] (22.0 dBm)
                        * 2437 MHz [6] (22.0 dBm)
                        * 2442 MHz [7] (22.0 dBm)
                        * 2447 MHz [8] (22.0 dBm)
                        * 2452 MHz [9] (22.0 dBm)
                        * 2457 MHz [10] (22.0 dBm)
                        * 2462 MHz [11] (22.0 dBm)
                        * 2467 MHz [12] (22.0 dBm)
                        * 2472 MHz [13] (22.0 dBm)
                        * 2484 MHz [14] (disabled)
        Band 2:
--
                Frequencies:
                        * 5180 MHz [36] (22.0 dBm) (no IR)
                        * 5200 MHz [40] (22.0 dBm) (no IR)
                        * 5220 MHz [44] (22.0 dBm) (no IR)
                        * 5240 MHz [48] (22.0 dBm) (no IR)
                        * 5260 MHz [52] (22.0 dBm) (no IR, radar detection)
                        * 5280 MHz [56] (22.0 dBm) (no IR, radar detection)
                        * 5300 MHz [60] (22.0 dBm) (no IR, radar detection)
                        * 5320 MHz [64] (22.0 dBm) (no IR, radar detection)
                        * 5340 MHz [68] (disabled)
                        * 5360 MHz [72] (disabled)
                        * 5380 MHz [76] (disabled)
                        * 5400 MHz [80] (disabled)
                        * 5420 MHz [84] (disabled)
                        * 5440 MHz [88] (disabled)
                        * 5460 MHz [92] (disabled)

Does that mean anything to anyone? Thanks.

-- 
Regards,
Sadeep
PGP: 103BF9E3E750BF7E