On 03/16/2016 11:44 PM, Linus Torvalds wrote:
> On Wed, Mar 16, 2016 at 2:23 PM, Linus Torvalds
> <torva...@linux-foundation.org> wrote:
>>
>>> Do you use 20Mhz or 40MHz?
>>
>> HT20 on 2.4GHz, HT40 on 5GHz.
>>
>> At least that's the wireless AP setup.
>>
>>> Basically, I'd like to see the output of iw dev
>>
>> I'll have to walk over and check. I don't have my machines set up so
>> you can get into them over the network..
> 
> Hmm. "iw dev" seems to say that device is using the 2.4Ghz side, at
> least in the working configuration.
> 
>   phy#0
>         Unnamed/non-netdev interface
>                 wdev 0x2
>                 addr a4:34:d9:0e:20:d7
>                 type P2P-device
>         Interface wlp1s0
>                 ifindex 3
>                 wdev 0x1
>                 addr a4:34:d9:0e:20:d6
>                 type managed
>                 channel 1 (2412 MHz), width: 20 MHz, center1: 2412 MHz
> 
> I have no idea why it wouldn't connect to the 5GHz network, but it
> might just be far enough away (a couple of walls, not so much
> distance) that it is borderline. Both networks have the same essid and
> password, maybe I should add a separate 5GHz network to make it easier
> to say "connect to that one" for testing, in case the trouble happens
> with the 5GHz side only.
> 

You can check the RSSI of both networks:

sudo iw wlp1s0 scan

>      Linus
> 
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