6GHz issue QCNCM865 (WCN7850) firmware

[Janek K]

I've opted to install the current mainline (6.16rc4) from Fedora-Vanilla repo. 
Using the new firmware and the mainline kernel did solved the 6GHz issue, but now it removed the 5GHz 160MHz option, that is not a deal breaker, but is nice to have.

now I get the correct country in iw reg get:

~$ iw reg get
global
country PL: 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 PL: 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

Thanks for the help


On Monday, 30 June 2025 at 03:48, Baochen Qiang <baochen.qiang at oss.qualcomm.com> wrote:

> 
> 
> 
> 
> On 6/28/2025 3:19 AM, Janek wrote:
> 
> > Hi,
> > 
> > Yesterday, I noticed that I could not "see" or connect to any 6GHz SSID/AP. After some checking, I noticed that my WiFi card was stuck with the reg country 00, as below:
> > 
> > $ iw reg get
> > global
> > country PL: 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
> > 
> > I'm not sure what caused this, but I suspect that is the firmware that was updated on last Sunday, as part of the Fedora 42 package named atheros-firmware-20250613-1.fc42 (WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3).
> > 
> > I've tried reverting the kernel to 6.14.9 (that I was running before the 6.15.3), it did not help, after manually downloading and installing the previous known good firmware, I got it to connect to 6GHz networks (both ax and be).
> > 
> > Currently installed firmware: atheros-firmware-20250410-1.fc42 (WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3) 6GHz working.
> > 
> > My system details
> > WiFi card: QCNCM865 (WCN7850)
> > Distro: Fedora 42
> > Kernel: 6.15.3 from Fedora
> 
> 
> Recently a series fixing 6 GHz issue has been merged upstream
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/wireless/ath/ath12k?id=d662c14a51910ba0ad66afd248b601ba30b9f7f1
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/wireless/ath/ath12k?id=37e775a0a9d79a031d28d9e21480f99f448e9215
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/wireless/ath/ath12k?id=886bb3624e4c9914a943b63fcfdf30b8d2f2b66e
> 
> Can you pick them and try again? Or even better to try the latest mainline kernel?
> 
> > Affected firmware: WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 (from Fedora package atheros-firmware-20250613-1.fc42)
> > 
> > related dmesg output:
> > [ 5.082826] ath12k_pci 0000:01:00.0: BAR 0 [mem 0x90600000-0x907fffff 64bit]: assigned
> > [ 5.082844] ath12k_pci 0000:01:00.0: enabling device (0000 -> 0002)
> > [ 5.083105] ath12k_pci 0000:01:00.0: MSI vectors: 16
> > [ 5.083110] ath12k_pci 0000:01:00.0: Hardware name: wcn7850 hw2.0
> > [ 5.733493] ath12k_pci 0000:01:00.0: chip_id 0x2 chip_family 0x4 board_id 0xff soc_id 0x40170200
> > [ 5.733499] ath12k_pci 0000:01:00.0: fw_version 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_SILICONZ-3
> > [ 5.733744] ath12k_pci 0000:01:00.0: failed to get ACPI BDF EXT: 0
> > [ 5.958726] ath12k_pci 0000:01:00.0 wlp1s0: renamed from wlan0
> > 
> > Let me know if there is any other info that I could get from my machine.
> > 
> > Thanks in advance,
> > Janek
> 
>