Arch Linux

codedcosmos

Member

Registered: 2017-09-25

Posts: 18

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 (Yesterday 11:49:30)

void4m0n

Member

Registered: Yesterday

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: 18,439

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: Today

Posts: 2

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