Enabling 6 GHz band in WCN785x

Baochen Qiang baochen.qiang at oss.qualcomm.com
Wed Aug 13 19:52:13 PDT 2025 


On 8/13/2025 5:43 PM, Petros Christopoulos wrote:
> The module changed to DE automatically a few seconds after I connected to an AP that
> advertised DE (using kernel 6.16.0, the same did not work with kernel 6.15.9 a couple of
> says ago, i.e. the module remained in region 00 despite connecting to the same AP).

Yeah, the 11D support does not land in 6.15.9 kernel.

> 
> Manual change does not work. Before connecting to the AP (and while the module was set to
> 00) I issued sudo iw reg set DE
> but this had no effect.
> 
> Of note, the option CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS is not enabled in the Fedora
> kernel I am using, so this now all makes perfect sense to me after your explanations.
> 

Great!

> Thank you very much!
> 
> 
> On 13.08.2025 10:57, Baochen Qiang wrote:
>>
>> 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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