Enabling 6 GHz band in WCN785x

Petros Christopoulos petros.christopoulos at gmail.com
Wed Aug 13 02:43:36 PDT 2025 

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).

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.

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.
>>>>>>
>>>>>>
>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 4760 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://lists.infradead.org/pipermail/ath12k/attachments/20250813/45065e86/attachment.p7s>

More information about the ath12k mailing list