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From:   JH <jupiter.hce@gmail.com>
Date:   Wed, 29 Jan 2020 20:21:32 +1100
Message-ID: <CAA=hcWTEnYraPy5Un7a7ryeDBJmf0KoCU2VoJjr5LJWtbc9j_g@mail.gmail.com>
Subject: Strange inconsistant WiFi network behaviour
To:     linux-wireless <linux-wireless@vger.kernel.org>,
        connman <connman@lists.01.org>
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Sender: linux-wireless-owner@vger.kernel.org
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Hi,

I have 2 iMX6 devices running uBlox Lily WiFi, mrvl firmware
sd8801_uapsta.bin in kernel 4.19.75. In my office, a WiFi router is
just 1 meter away, the WiFi signal should not be a problem. One device
could connect to the WiFi router well and stably, one could not, here
were error messages:

[  408.990029] ieee80211 phy0: mwifiex_cfg80211_sched_scan_start :
Invalid Sched_scan parameters
.....................

[56.986414] ieee80211 phy0: mwifiex_cfg80211_sched_scan_start :
Invalid Sched_scan parameter

connmand[13469]:
../connman-1.35/src/service.c:preferred_tech_add_by_type() type 5
service 0x119120 Telstra
connmand[13469]: ../connman-1.35/src/service.c:auto_connect_service()
preferred 1 sessions 0 reason auto
connmand[13469]: ../connman-1.35/src/ntp.c:send_timeout() send timeout
2 (retries 0)
connmand[13469]:
../connman-1.35/plugins/ofono.c:netreg_update_strength() /ubloxqmi_2
Strength 80
connmand[13469]: ../connman-1.35/src/ntp.c:send_timeout() send timeout
4 (retries 1)
connmand[13469]: ../connman-1.35/plugins/wifi.c:throw_wifi_scan()
device 0x118da8 0x116c78
connmand[13469]:
../connman-1.35/src/device.c:connman_device_ref_debug() 0x118da8 ref 4
by ../connman-1.35/plugins/wifi.c:1214:throw_wifi_scan()
connmand[13469]:
../connman-1.35/src/device.c:connman_device_set_scanning() device
0x118da8 scanning 1
connmand[13469]:
../connman-1.35/src/technology.c:__connman_technology_scan_started()
device 0x118da8
connmand[13469]: ../connman-1.35/plugins/wifi.c:autoscan_timeout() interval 27
connmand[13469]: ../connman-1.35/plugins/wifi.c:interface_state() wifi
0x11a7c8 interface state 4
connmand[13469]: ../connman-1.35/plugins/wifi.c:scan_started()
connmand[13469]: ../connman-1.35/src/rtnl.c:rtnl_message() NEWLINK len
56 type 16 flags 0x0000 seq 0 pid 0
connmand[13469]: ../connman-1.35/plugins/wifi.c:scan_finished()
connmand[13469]: ../connman-1.35/plugins/wifi.c:interface_state() wifi
0x11a7c8 interface state 3

Both devices were installed the same firmware and software, if it was
firmware / software issues, both would not be able to connect to WiFi,
as one device could connect to the office WiFi router well, it could
not the WiFi router problem either.

If I move the faulty one to my home, it could connect to my home WiFi,
so the device does not have WiFi problem, that is really confusing,
what could cause that kind problem and how to debug and fix it?

Thank you.

Kind regards,

- jh