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From:   Krishna Chaitanya <chaitanya.mgit@gmail.com>
Date:   Mon, 30 Sep 2019 21:29:31 +0530
Message-ID: <CABPxzY+8Jjvjv0x79yzo+rL3nONTZSkROK1T+gMqq5nhXb=7-g@mail.gmail.com>
Subject: Re: mac80211_hwsim (kernel 4.18+): wmediumd + 2.4Ghz
To:     Ramon Fontes <ramonreisfontes@gmail.com>
Cc:     Johannes Berg <johannes@sipsolutions.net>,
        linux-wireless <linux-wireless@vger.kernel.org>
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On Sun, Sep 29, 2019 at 10:50 PM Ramon Fontes <ramonreisfontes@gmail.com> wrote:
>
> > Still doesn't explain why it should work in 4.17 and not in 4.18, there
> > aren't a lot of wifi changes there at all.
>
> I just tested it with 4.15 and it didn't work. However, It works in
> 4.15 in other PC. At first these 2 PCs have the same packages with
> apparently the same version. The only thing I can highlight about the
> difference between them is that: (i) Ubuntu has been upgraded from
> 16.04 to 18.04 (it works fine up to 4.17) and (ii) Ubuntu 18.04 has
> been installed from scratch (it doesn't work at all - tested from
> 4.15).

Based on this info, looks like hostapd/wpa_s versions might be causing
the difference,
can you please confirm the versions on both?