6GHz issue QCNCM865 (WCN7850) firmware

[Baochen Qiang]

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
>