Arch Linux

codedcosmos

Member

Registered: 2017-09-25

Posts: 19

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

I updated to the newest kernel and firmware from testing:

6.14.7-arch2-1

Seems to fix it for me, not sure if it was the firmware or the kernel. But I am happy.

Pabley

Member

Registered: 2025-05-11

Posts: 5

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

The reverted linux-firmware 20250508.788aadc8-2 works fine for me with linux 6.14.6.arch1-1.

Arisa

Member

From: Valhalla

Registered: 2019-11-12

Posts: 11

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Dunno if related but mine still doesn't work

kernel: ath12k_pci 0000:09:00.0: failed to send HAL_REO_CMD_FLUSH_CACHE, tid 10 (-105)
kernel: ath12k_pci 0000:09:00.0: failed to send HAL_REO_CMD_FLUSH_CACHE, tid 10 (-105)
kernel: ath12k_pci 0000:09:00.0: failed to send HAL_REO_CMD_FLUSH_CACHE cmd, tid 10 (-105)
kernel: ath12k_pci 0000:09:00.0: failed to send HAL_REO_CMD_FLUSH_CACHE, tid 11 (-105)
kernel: ath12k_pci 0000:09:00.0: failed to send HAL_REO_CMD_FLUSH_CACHE, tid 11 (-105)
kernel: ath12k_pci 0000:09:00.0: failed to send HAL_REO_CMD_FLUSH_CACHE cmd, tid 11 (-105)
kernel: ath12k_pci 0000:09:00.0: failed to send HAL_REO_CMD_FLUSH_CACHE cmd, tid 12 (-105)
kernel: ath12k_pci 0000:09:00.0: failed to send HAL_REO_CMD_FLUSH_CACHE cmd, tid 13 (-105)
kernel: ath12k_pci 0000:09:00.0: failed to send HAL_REO_CMD_FLUSH_CACHE cmd, tid 14 (-105)
kernel: ath12k_pci 0000:09:00.0: failed to send HAL_REO_CMD_FLUSH_CACHE cmd, tid 15 (-105)
kernel: ath12k_pci 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0015 address=0xf9e1c800 flags=0x0020]
kernel: ath12k_pci 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0015 address=0xf9e5c800 flags=0x0020]
kernel: ath12k_pci 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0015 address=0xf9e19000 flags=0x0020]
kernel: ath12k_pci 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0015 address=0xf9e22800 flags=0x0020]
kernel: ath12k_pci 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0015 address=0xf9e17000 flags=0x0020]
kernel: ath12k_pci 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0015 address=0xf9e12000 flags=0x0020]

get a lot of errors about it able to access some memory and such, it is not able to receive any data, even enough to establish DHCP for IP or such

EDIT:
it actually seems to be same issue as this: https://bbs.archlinux.org/viewtopic.php?id=301045

Last edited by Arisa (2025-05-24 11:49:30)

void4m0n

Member

Registered: 2025-05-24

Posts: 1

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

It seems that the latest linux-firmware fixes the problem, my card is now detected and seems to work perfectly.

pacman -Q linux-firmware
linux-firmware 20250508.788aadc8-2

https://gitlab.com/kernel-firmware/linu … 3ba3c96031

loqs

Member

Registered: 2014-03-06

Posts: 18,471

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

It seems that the latest linux-firmware fixes the problem, my card is now detected and seems to work perfectly.

pacman -Q linux-firmware
linux-firmware 20250508.788aadc8-2

https://gitlab.com/kernel-firmware/linu … 3ba3c96031

Just to note linux-firmware [20250508.788aadc8-2] reverted 360fd45 ath12k: WCN7850 hw2.0: update to WLAN.HMT.1.1.c5-00284-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 the upstream fix 2e91d8c ath12k: WCN7850 hw2.0: update to WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 will be included in the next upstream release of linux-firmware.

maclin1963

Member

Registered: 2025-04-20

Posts: 1

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Identified though the latest 6.14.7-arch2-1 get WiFi connection, but I could not select different SSID for alternative WiFi connection. When selecting different SSID to connect, system will stocked and you cannot even shutdown the system. Checked the LTS there's no such issue. Hope this info is helpful.

Luuuu

Member

Registered: 2025-05-25

Posts: 3

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Hi all,

after struggling a bit with my wifi i have noted the last firmware package doesn't create a directory structures like this.

ls

drwxr-xr-x - root 25 mag 01:48  1.0

drwxr-xr-x - root 25 mag 01:48  1.0.c5

drwxr-xr-x - root 25 mag 01:48  1.1

.rw-r--r-- 2,8M root 22 mag 20:06  amss.bin.zst

.rw-r--r-- 34k root 22 mag 20:06  board-2.bin.zst

.rw-r--r-- 139k root 22 mag 20:06  m3.bin.zst

.rw-r--r-- 11k root 22 mag 20:06  Notice.txt.zst

/lib/firmware/ath12k/WCN7850/hw2.0

❯ ls 1.0

drwxr-xr-x - root 25 mag 01:48  WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4

/lib/firmware/ath12k/WCN7850/hw2.0

❯ ls 1.0.c5/

drwxr-xr-x - root 25 mag 01:48  WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

/lib/firmware/ath12k/WCN7850/hw2.0

❯ ls 1.1

drwxr-xr-x - root 25 mag 01:48  WLAN.HMT.1.1.c5-00284-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

drwxr-xr-x - root 25 mag 01:48  WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

/lib/firmware/ath12k/WCN7850/hw2.0

I had to manually download via

git clone https://git.codelinaro.org/clo/ath-firm … k-firmware

and copy it manually.

Now the firmware is correctly loaded on kernel 6.14.8

iha_niaz11

Member

Registered: 2025-05-27

Posts: 5

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Hey guys any news about this issue

loqs

Member

Registered: 2014-03-06

Posts: 18,471

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Hey guys any news about this issue

https://bbs.archlinux.org/viewtopic.php … 6#p2243026

iha_niaz11

Member

Registered: 2025-05-27

Posts: 5

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Can U explain that to me I am new inteo arch Linux. So is it finally fixed or just half a way

loqs

Member

Registered: 2014-03-06

Posts: 18,471

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Can U explain that to me I am new inteo arch Linux. So is it finally fixed or just half a way

linux-firmware 20250508.788aadc8-2 reverted the bad commit fixing the issue. The next upstream linux-firmware release will fix the issue with updated firmware rather than  reverting to older firmware.

iha_niaz11

Member

Registered: 2025-05-27

Posts: 5

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Thank U man

iha_niaz11

Member

Registered: 2025-05-27

Posts: 5

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Is the problem now solved? Caus I see I still have some files missing for the firmware

loqs

Member

Registered: 2014-03-06

Posts: 18,471

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Is the problem now solved? Caus I see I still have some files missing for the firmware

Do you have the same card as the topic starter? Are you experiencing the same symptoms? What firmware files are missing?

zikasak

Member

Registered: 2025-06-22

Posts: 4

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

After today's linux-firmware update I stuck with this issue again...

Luuuu

Member

Registered: 2025-05-25

Posts: 3

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

After today's linux-firmware update I stuck with this issue again...

The same to me
i have open a bug ticket

https://bugzilla.kernel.org/show_bug.cgi?id=220254

zikasak

Member

Registered: 2025-06-22

Posts: 4

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

After today's linux-firmware update I stuck with this issue again...

The same to me
i have open a bug ticket

https://bugzilla.kernel.org/show_bug.cgi?id=220254

it seems to be a different issue, actually. I compile linux-mainline (6.16rc2). It works there.

domx93

Member

Registered: 2020-11-30

Posts: 51

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Same issue here. I solved with linux-lts, but I hope this will be fixed soon in the last kernel...

slayerking

Member

Registered: 2021-03-02

Posts: 9

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

After today's linux-firmware update I stuck with this issue again...

Yep me too both wifi and bluetooth gone.
Asus tuf gaming x670e plus wifi
EDIT: Fixed by downgrading linux-firmware

Last edited by slayerking (2025-06-22 22:47:05)

caioquirino

Member

Registered: 2025-06-23

Posts: 2

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

I have noticed that exactly today as I have updated my pc. Basically, it went from a single linux-firmware package, to a bunch of child packages, and one happened to be linux-firmware-atheros.
The new package linux-firmware-atheros, was giving an older firmware: WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
So when I have downgraded the package, a newer version of the firmware was used instead: WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

From 1.0 to 1.1 after downgrading the package.

What I just did was:

sudo pacman -R linux-firmware-amdgpu linux-firmware-atheros linux-firmware-broadcom linux-firmware-intel linux-firmware-mediatek linux-firmware-nvidia linux-firmware-other linux-firmware-radeon linux-firmware-realtek linux-firmware-whence
sudo pacman -R linux-firmware

Then installed the following version using `downgrade linux-firmware`:
linux-firmware 20250508.788aadc8-2

If that is the case for you, I think there is a regression (literally), and the newer packages needs to be corrected.

Edit: Mixed mentioning the versions. So fixed now (old firmware in new package, new firmware in old package)

Last edited by caioquirino (2025-06-23 18:03:29)

domx93

Member

Registered: 2020-11-30

Posts: 51

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

I have noticed that exactly today as I have updated my pc. Basically, it went from a single linux-firmware package, to a bunch of child packages, and one happened to be linux-firmware-atheros.
The new package linux-firmware-atheros, was giving an older firmware: WLAN.HMT.1.1.c5-00284.1-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
So when I have downgraded the package, a newer version of the firmware was used instead: WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

From 1.0 to 1.1 after downgrading the package.

What I just did was:

sudo pacman -R linux-firmware-amdgpu linux-firmware-atheros linux-firmware-broadcom linux-firmware-intel linux-firmware-mediatek linux-firmware-nvidia linux-firmware-other linux-firmware-radeon linux-firmware-realtek linux-firmware-whence
sudo pacman -R linux-firmware

Then installed the following version using `downgrade linux-firmware`:
linux-firmware 20250508.788aadc8-2

If that is the case for you, I think there is a regression (literally), and the newer packages needs to be corrected.

thank you, it worked for me too, so I don't need to use linux-lts anymore. For now I keep linux-firmware in IgnorePkg,  let's hope the issue will be solved soon.

caioquirino

Member

Registered: 2025-06-23

Posts: 2

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

Hi all, I have just checked there was a new update today and now I have this version running:

fw_version 0x100301e1 fw_build_timestamp 2023-12-06 04:05 fw_build_id QC_IMAGE_VERSION_STRING=WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

It looks like they changed it to the working version. So I think it is now safe to update and remove the IgnorePkg. Thanks!

rLy

Member

From: Hungary

Registered: 2011-06-01

Posts: 8

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

I have the same chip but still doesn't work. The last time it worked based on logs was the beginning of June.

Jun 03 05:58:00 valhalla kernel: input: HDA ATI HDMI HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/>
Jun 03 05:58:00 valhalla kernel: input: HDA ATI HDMI HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/>
Jun 03 05:58:00 valhalla kernel: input: HDA ATI HDMI HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/>
Jun 03 05:58:00 valhalla kernel: ath12k_pci 0000:0a:00.0: Hardware name: wcn7850 hw2.0
Jun 03 05:58:00 valhalla kernel: ath12k_pci 0000:0a:00.0: MSI vectors: 16
Jun 03 05:58:00 valhalla kernel: snd_hda_intel 0000:03:00.1: bound 0000:03:00.0 (ops amdgpu_dm_audio_component_bind_ops [amdgpu])
Jun 03 05:58:00 valhalla kernel: ath12k_pci 0000:0a:00.0: enabling device (0000 -> 0002)
Jun 03 05:58:00 valhalla kernel: ath12k_pci 0000:0a:00.0: BAR 0 [mem 0xdca00000-0xdcbfffff 64bit]: assigned
Jun 03 05:58:00 valhalla systemd[1]: Finished Virtual Console Setup.

╭─[Thu 25/06/26 15:31 CEST][pts/1|zsh][6.15.3-arch1-1/x86_64/1.11, 1.67, 4.45]
├─[rly@valhalla:~]
╰─1013 [1] $ sudo dmesg | grep -i ath12k
╭─[Thu 25/06/26 15:31 CEST][pts/1|zsh][6.15.3-arch1-1/x86_64/1.11, 1.67, 4.45]
├─[rly@valhalla:~]
╰─1014 [1] $ trizen -Qi linux-firmware       
Name            : linux-firmware
Version         : 20250613.12fe085f-9

domx93

Member

Registered: 2020-11-30

Posts: 51

Re: wlan0 disappeared with Wi-Fi WCN785x card (ath12k_pci)

For me the last update solved the issue!