vc4.ko causes another misterious error

[Stefan Wahren]

Hi Ryutaroh,

Am 25.03.21 um 07:55 schrieb Ryutaroh Matsumoto:
> Hi Stefan, thank you for your continued interest in this topic.
>
>>> sorry, this error description isn't helpful. Wifi especially 802.11ac
>>> has a little bit more than a simple on/off switch.
>>> Which wifi channel do you use?
>>> Can you provide the output of "iw reg get", "iw list" and "ifconfig
>>> wlan0" in case the issue occurs?
>>> Is it still correct that the wifi connection is established, but higher
>>> communication like IP doesn't work?
>>> Can you please provide the content of
>>> "/lib/firmware/brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.txt"
>> I recheck the situation with Debian kernel 5.10.24 and
>> Debian firmware-brcm80211 20201218-3.
>> 5GHz WiFi works fine with vc4 and without vc4.
> It was incorrect. Actually, 5GHz WiFi with vc4 fails with 5260 MHz.

thanks for providing these information. Firmware board file looks good.

In order to narrow this down (more a general 5 GHz or a DFS specific
issue), are you able to change temporary the channel of your AP to one
of the following:

5180 MHz [36]
5190 MHz [38]
5200 MHz [40]
5210 MHz [42]
5220 MHz [44]
5230 MHz [46]
5240 MHz [48]

and retest with enabled vc4? Does the situation improve?

Best regards