Enabling 6 GHz band in WCN785x

Baochen Qiang baochen.qiang at oss.qualcomm.com
Wed Aug 13 01:57:25 PDT 2025 


On 8/13/2025 2:50 PM, Petros Christopoulos wrote:
> Dear Baochen,
> 
> great, thank you very much for the prompt and clear reply.
> 
> Indeed with the new kernel (6.16.0) when I connect to an AP in DE, the Wifi module
> switches to DE

By manually setting country code to DE? or driver detects it automatically?

> and keeps the DE region even after disconnection and reboot.
> 
> This was not possible with the previous kernel 6.15.9 (I had already tested it with the
> same AP as now, but no success).
> 
> Thus, my basic problem is solved, and I also now know how to enable manual switching.
> 
> Thanks a lot for the advice and above all for the excellent developer work behind
> implementation!

glad to help :)

> 
> Best wishes,
> 
> Petros
> 
> 
> global
> country DE: DFS-ETSI
> (2400 - 2483 @ 40), (N/A, 20), (N/A)
> (5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
> (5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
> (5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
> (5725 - 5875 @ 80), (N/A, 13), (N/A)
> (5945 - 6425 @ 320), (N/A, 23), (N/A), NO-OUTDOOR
> (57000 - 66000 @ 2160), (N/A, 40), (N/A)
> 
> phy#0 (self-managed)
> country DE: DFS-ETSI
> (2402 - 2482 @ 40), (N/A, 20), (N/A)
> (5170 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
> (5250 - 5330 @ 80), (N/A, 23), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
> (5490 - 5590 @ 80), (N/A, 30), (0 ms), DFS, AUTO-BW
> (5590 - 5650 @ 40), (N/A, 30), (600000 ms), DFS, AUTO-BW
> (5650 - 5710 @ 40), (N/A, 30), (0 ms), DFS, AUTO-BW
> (5735 - 5855 @ 80), (N/A, 14), (N/A), AUTO-BW
> (5855 - 5875 @ 20), (N/A, 14), (N/A), AUTO-BW
> (5945 - 6425 @ 320), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
> 
> 
> 
> 
> On 13.08.2025 05:13, Baochen Qiang wrote:
>>
>> On 8/13/2025 6:22 AM, Petros Christopoulos wrote:
>>> Dear Baochen,
>>>
>>> I tried the kernel 6.16.0 today (kernel-6.16.0-200.fc42.x86_64.rpm; it is Fedora kernel
>>> test week now) which contains the commit dcfebfd4c8dc0bec9b6649104cecc09f5978c4cb
>>> (=revision v6.16-rc1~132^2~157^2~16^2~62)
>>>
>>> but the behavior regarding the Wifi module WCN785x has not changed:
>>>
>>> despite  sudo iw reg set DE,
>>> phy#0 remains self managed (see below at the end)
>>>
>>> However, the option CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS is not enabled in the Fedora
>>> kernel, and I have asked the maintainers if this could be enabled (everything is of course
>>> simpler if I do not have to recompile every kernel myself, https://bugzilla.redhat.com/
>>> show_bug.cgi?id=2387486)
>>>
>>> I noticed this option is relevant inside the ath12k code, e.g.
>>>
>>> $ grep -r CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS drivers/net/wireless/ath/ath12k/
>>> drivers/net/wireless/ath/ath12k/reg.c:  if (!
>>> IS_ENABLED(CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS)) {
>>>
>>> Could you please let me know:
>>>
>>> 1. whether having this option enebled in the kernel is absolutely necessary for the
>>> ability to change the region or there are also alternatives?
>> The option is only necessary if you want to manually set the country code. Normally the
>> driver/firmware should be able to detect automatically the country from AP's frames using
>> 11D feature.
>>
>> 11D feature takes some time to detect country info, so please wait, say at least 1 minute,
>> before you make conclusion. If still fail, please help collect verbose ath12k log with
>>
>>     modprobe ath12k debug_mask=0xffffffff
>>
>>> 2. whether if this option is enabled with kernel 6.16.0 (with the commit above), I should
>>> be able to change the region of the WCN785x module with a simple sudo iw reg set DE, or
>>> whether still another special method will be necessary?
>> Enabling CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS will let you be able to set country code
>> using iw. There is no alternative for this purpose.
>>
>>> Thank you very much and kind regards
>>>
>>> Petros
>>>
>>>
>>> global
>>> country DE: DFS-ETSI
>>>          (2400 - 2483 @ 40), (N/A, 20), (N/A)
>>>          (5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
>>>          (5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
>>>          (5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
>>>          (5725 - 5875 @ 80), (N/A, 13), (N/A)
>>>          (5945 - 6425 @ 320), (N/A, 23), (N/A), NO-OUTDOOR
>>>          (57000 - 66000 @ 2160), (N/A, 40), (N/A)
>>>
>>> phy#0 (self-managed)
>>> country 00: DFS-UNSET
>>>          (2402 - 2472 @ 40), (N/A, 20), (N/A)
>>>          (2457 - 2482 @ 20), (N/A, 20), (N/A), PASSIVE-SCAN
>>>          (5170 - 5330 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>>>          (5490 - 5730 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>>>          (5735 - 5895 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> On 12.08.2025 05:21, Baochen Qiang wrote:
>>>> On 8/10/2025 9:56 PM, Petros Christopoulos wrote:
>>>>> Dear all, I have a Qualcomm Technologies, Inc WCN785x Wi-Fi 7(802.11be) 320MHz 2x2
>>>>> [FastConnect 7800] [17cb:1107] (rev 01) Wifi controller
>>>>> with Fedora 42 KDE, latest kernel 6.15.9-201.fc42.x86_64 and recent firmware 0x1108811c
>>>>> fw_build_timestamp 2025-05-17 00:21 fw_build_id
>>>>> QC_IMAGE_VERSION_STRING=WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V2.0_SI
>>>>> LICONZ-3
>>>>>
>>>>> The 6 GHz band is disabled, I suspect that the problem is the 00 region setting in
>>>>> phy#1,
>>>>> however as this is "self-managed" I have not managed to change this (iw reg set or an /
>>>>> etc/modprobe.d/ath12k.conf file with "options ath12k country=DE" have no effects).
>>>> Try with CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS enabled.
>>>>
>>>>> $ iw reg get
>>>>> global
>>>>> country DE: DFS-ETSI
>>>>> (2400 - 2483 @ 40), (N/A, 20), (N/A)
>>>>> (5150 - 5250 @ 80), (N/A, 23), (N/A), NO-OUTDOOR, AUTO-BW
>>>>> (5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW
>>>>> (5470 - 5725 @ 160), (N/A, 26), (0 ms), DFS
>>>>> (5725 - 5875 @ 80), (N/A, 13), (N/A)
>>>>> (5945 - 6425 @ 320), (N/A, 23), (N/A), NO-OUTDOOR
>>>>> (57000 - 66000 @ 2160), (N/A, 40), (N/A)
>>>>>
>>>>> phy#1 (self-managed)
>>>>> country 00: DFS-UNSET
>>>>> (2402 - 2472 @ 40), (N/A, 20), (N/A)
>>>>> (2457 - 2482 @ 20), (N/A, 20), (N/A), PASSIVE-SCAN
>>>>> (5170 - 5330 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>>>>> (5490 - 5730 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>>>>> (5735 - 5895 @ 160), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
>>>>>
>>>>> I have searched extensively the web, found some relevant articles (e.g. https://
>>>>> patchwork.kernel.org/project/linux-wireless/patch/20250401020840.357-5-
>>>>> quic_kangyang at quicinc.com/, which should be integrated into 6.15.9 if I understand
>>>>> correctly), but still no solution.
>>>> Do you mean with the whole 11D support series merged the issue is still seen?
>>>>
>>>>> I would be grateful for some help.
>>>>>
>>>>> Thank you very much.
>>>>>
>>>>>
>>>>

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