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BollerwagenPicard

Member

From: Grimma | Germany

Registered: 2021-07-30

Posts: 42

[btqca] Qualcomm WCN785x (FastConnect 7800) stuck in "Rome" fallback I

Hi everyone,

I am trying to get Bluetooth LE Audio (ISO channels / Auracast) working on a Qualcomm WCN785x (FastConnect 7800) Wi-Fi/BT card. The card is installed in a Framework 13 Laptop running the latest Arch Kernel.

The Problem:
The bluetooth controller seems to be stuck in a fallback state. btqca detects it with the generic "Rome" ID (0x190200) instead of the proper "Hamilton" ID.
Consequently, it requests the legacy rampatch_usb_00190200.bin firmware.

Even when forcing the correct Hamilton firmware (hmtbtfw20.tlv) via symlinks to the requested legacy name, the driver loads it (Version upgrades from 12 to 13, TxPower increases), but ISO support remains broken.
I'm seeing: Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is advertised, but not supported.
bluetoothctl show confirms missing Broadcast Audio Announcement (0x1852) UUIDs.

System Info:
    Card: Qualcomm WCN785x (FastConnect 7800) - aftermarket upgrade
    Kernel: 6.17.8-arch1-1 (current stable)
    BlueZ: 5.79 (Daemon started with -E)
    Attempts:
        Cold boot (Battery disconnect) to clear controller state -> No change, stuck on ID 0x190200.
        Symlink hack (mapping hmt... to rampatch...) -> Firmware loads, but ISO handshake fails.

Has anyone with a WCN785x on Arch managed to get the btqca driver to correctly identify the chip without falling back to the Rome ID?
Is this a known regression in the current kernel module for this chipset?

Thanks! And sorry that I have a 2nd question to this card.

sdmcclain

Member

Registered: 2024-12-04

Posts: 3

Re: [btqca] Qualcomm WCN785x (FastConnect 7800) stuck in "Rome" fallback I

I am in the exact same spot: I just upgrade my Framework 16 7040 laptop to the Qualcomm NCM865 chip. WiFi is working great (negotiating 6Ghz with 320Mhz channel width and getting ~2Gbits/sec on my LAN), but bluetooth is essentially not functional. As you said, the driver is trying to load the "rome" firmware instead of "hamilton", and crashing:

~ φ sudo dmesg | grep -i blue
[    3.689180] Bluetooth: Core ver 2.22
[    3.689204] NET: Registered PF_BLUETOOTH protocol family
[    3.689206] Bluetooth: HCI device and connection manager initialized
[    3.689214] Bluetooth: HCI socket layer initialized
[    3.689217] Bluetooth: L2CAP socket layer initialized
[    3.689222] Bluetooth: SCO socket layer initialized
[    3.749593] Bluetooth: hci0: using rampatch file: qca/rampatch_usb_00190200.bin
[    3.749596] Bluetooth: hci0: QCA: patch rome 0x190200 build 0x8567, firmware rome 0x190200 build 0x43fb
[    4.401432] Bluetooth: hci0: using NVM file: qca/nvm_usb_00190200.bin
[    4.540419] Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is advertised, but not supported.
[    5.436028] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    5.436033] Bluetooth: BNEP filters: protocol multicast
[    5.436038] Bluetooth: BNEP socket layer initialized
[    5.436996] Bluetooth: MGMT ver 1.23
[    9.380816] Bluetooth: RFCOMM TTY layer initialized
[    9.380825] Bluetooth: RFCOMM socket layer initialized
[    9.380827] Bluetooth: RFCOMM ver 1.11
[ 1462.580351] Bluetooth: hci0: ACL memdump size(589824)
[ 1463.150787] Bluetooth: hci0: memdump done: pkts(2418), total(589824)
[ 1463.158213] Bluetooth: hci0: hardware error 0x85
[ 1463.567296] Bluetooth: hci0: HCI reset during shutdown failed
[ 1464.082310] Bluetooth: hci1: using NVM file: qca/nvm_usb_00190200.bin
[ 1464.225423] Bluetooth: hci1: HCI Enhanced Setup Synchronous Connection command is advertised, but not supported.
[ 1464.657452] Bluetooth: MGMT ver 1.23
[ 1751.140438] Bluetooth: ISO socket layer initialized

Were you ever able to get this working?

Last edited by sdmcclain (2026-01-11 20:32:36)