Re: brcmfmac disconnects when iwd scans

On June 12, 2025 6:51:29 PM KeithG <[email protected]> wrote:

> ...
>
> On Thu, Jun 12, 2025 at 9:37 AM Arend Van Spriel
> <[email protected]> wrote:
>>
>> On June 12, 2025 3:51:34 PM KeithG <[email protected]> wrote:
>>
>>> Arend,
>>>
>>> I am still seeing this:
>>> wpa_supplicant[431]: wlan0: Failed to initiate sched scan
>>>
>>> I tried the brcmfmac options listed above and got no change? Still
>>> getting this every 6 seconds in the log.
>>> Did I get the command in the modprobe conf wrong?
>>
>> Maybe. You could try to merge the two value so one line with 0x200002.
>> Could be that wpa_supplicant determines support for scheduled scan in an
>> unexpected way. Have not looked at the wpa_supplicant code for that.
>>
>> Regards,
>> Arend
>>
>>>
>>> On Fri, May 9, 2025 at 1:01 PM KeithG <[email protected]> wrote:
>>>>
>>>>>>
>>>>>> With this setup, things work really well and the only strange thing I
>>>>>> am getting is a 'failed scheduled scan' message in the log every ~6
>>>>>> sec.
>>>>>>
>>>>>> May 09 08:53:50 pi4 wpa_supplicant[2254218]: wlan0: Failed to initiate
>>>>>> sched scan
>>>>>> May 09 08:53:57 pi4 wpa_supplicant[2254218]: wlan0: Failed to initiate
>>>>>> sched scan
>>>>>> May 09 08:54:03 pi4 wpa_supplicant[2254218]: wlan0: Failed to initiate
>>>>>> sched scan
>>>>>> May 09 08:54:09 pi4 wpa_supplicant[2254218]: wlan0: Failed to initiate
>>>>>> sched scan
>>>>>> May 09 08:54:16 pi4 wpa_supplicant[2254218]: wlan0: Failed to initiate
>>>>>> sched scan
>>>>>> May 09 08:54:22 pi4 wpa_supplicant[2254218]: wlan0: Failed to initiate
>>>>>> sched scan
>>>>>
>>>>> I thought wpa_supplicant had a config option to disable scheduled scan, but
>>>>> can not find it. You can disable it in brcmfmac using feature_disable=2
>>>>> modparam.
>>>>>
>>>>> Regards,
>>>>> Arend
>>>> Arend,
>>>>
>>>> Thanks. I must be doing something wrong as I still get the 'Failed to
>>>> initiate scan' spammed in the log with this config:
>>>>
>>>> # cat /etc/modprobe.d/brcmfmac.conf
>>>> options brcmfmac feature_disable=0x200000
>>>> options brcmfmac feature_disable=2
>>>>
>>>> Do I have it formatted wrong?
>>>>
>>>> Keith
>>>>
>>>> I think you suggested the the first line due to a different log
>>>> spamming message.
> Arend,
>
> Thanks for the help, but that does not seem to change anything. My
> modprobe.conf:
>
> # cat /etc/modprobe.d/brcmfmac.conf
> options brcmfmac feature_disable=0x200002
>
> Still lost of the same "wpa_supplicant[423]: wlan0: Failed to initiate
> sched scan" every 6 seconds.
>
> When I reboot, I get these mesages wrt wpa_supplicant (journalctl | grep wpa):
> Jun 12 11:05:48 pi4 systemd[1]: Created slice
> system-wpa_supplicant.slice - Slice /system/wpa_supplicant.
> Jun 12 11:05:51 pi4 systemd[1]: Started [email protected] -
> WPA supplicant daemon (interface-specific version).
> Jun 12 11:05:53 pi4 wpa_supplicant[423]: Successfully initialized 
> wpa_supplicant
> Jun 12 11:05:54 pi4 wpa_supplicant[423]: nl80211: kernel reports:
> Registration to specific type not supported
> Jun 12 11:06:07 pi4 wpa_supplicant[423]: wlan0: Failed to initiate sched scan
> lots more...
> Jun 12 11:07:51 pi4 wpa_supplicant[423]: wlan0:
> CTRL-EVENT-REGDOM-CHANGE init=USER type=COUNTRY alpha2=US
> Jun 12 11:06:07 pi4 wpa_supplicant[423]: wlan0: Failed to initiate sched scan
> lots more...
>
> yet when I look, it seems it has scanned and are there SSIDs:

Right. Scheduled scan is a different API compared to the normal scan. It 
allows userspace to say "scan periodically and let me know when you see any 
of the ssids I am interested in" to the driver/firmware and go take a nap.

If I remember correctly wpa_supplicant does a couple of normal scans and 
when it doesn't see the ssids in its config file, it switches to using the 
scheduled scan api.

Regards,
Arend

> # wpa_cli scan_results
> Selected interface 'wlan0'
> bssid / frequency / signal level / flags / ssid
> c0:94:35:54:bb:10       5220    -59     [WPA2-PSK-CCMP][WPS][ESS]
> AlignedHedronNetwork
> d2:94:35:54:bb:10       5220    -69     [WPA2-EAP-CCMP][ESS][HS20]
> Xfinity Mobile
> c6:4f:d5:4b:36:c0       5785    -68     [WPA2-PSK-CCMP][ESS]
> c6:4f:d5:4b:36:c2       5785    -68     [WPA2-PSK+SAE-CCMP][ESS]
> ameliafanclub