[Bug 221832] MT7925 (Foxcon T99H493.03) BT missing in lsusb on Vivobook S16

https://bugzilla.kernel.org/show_bug.cgi?id=221832

--- Comment #5 from IQ ([email protected]) ---
extract from dmesg: (it is trying to init wcn7850)

[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x512f0011]
[    0.000000] Linux version 7.2.0-rc5 (root@A16) (gcc (Ubuntu 14.2.0-4ubuntu2)
14.2.0, GNU ld (GNU Binutils for Ubuntu) 2.43.1) #1 SMP PREEMPT_DYNAMIC Sun Aug
 2 13:19:20 EST 2026
[    0.000000] KASLR disabled on command line
[    0.000000] Machine model: ASUS Vivobook S 15 X1P-42-100
[    0.000000] earlycon: efifb0 at I/O port 0x0 (options '')
[    0.000000] printk: legacy bootconsole [efifb0] enabled
[    0.000000] efi: EFI v2.9 by INSYDE Corp.
[    0.000000] efi: SMBIOS=0xd4462000 SMBIOS 3.0=0xd445f000
TPMFinalLog=0xd46e0000 ACPI 2.0=0xd47d3018 MEMATTR=0xd0a2a018 ESRT=0xcf3d8c98
TPMEventLog=0xd4771018 INITRD=0xc4845518 RNG=0xd47d3918 MEMRESERVE=0xc484a018
[    0.000000] random: crng init done
[    0.000000] esrt: Reserving ESRT space from 0x00000000cf3d8c98 to
0x00000000cf3d8d48.
[    0.000000] Skipping dt linux,cma-default node in favor for "cma=" kernel
param.
....
[    7.914566] qcom-pcie 1c08000.pci: iATU: unroll T, 8 ob, 8 ib, align 4K,
limit 1024G
[    7.922145] Bluetooth: Core ver 2.22
[    7.922168] NET: Registered PF_BLUETOOTH protocol family
[    7.922170] Bluetooth: HCI device and connection manager initialized
[    7.922174] Bluetooth: HCI socket layer initialized
[    7.922176] Bluetooth: L2CAP socket layer initialized
[    7.922178] Bluetooth: SCO socket layer initialized
...
[    8.140142] Bluetooth: HCI UART driver ver 2.3
[    8.140149] Bluetooth: HCI UART protocol H4 registered
[    8.140150] Bluetooth: HCI UART protocol BCSP registered
[    8.140191] Bluetooth: HCI UART protocol LL registered
[    8.140192] Bluetooth: HCI UART protocol ATH3K registered
[    8.140220] Bluetooth: HCI UART protocol Three-wire (H5) registered
[    8.140298] Bluetooth: HCI UART protocol Intel registered
[    8.140331] Bluetooth: HCI UART protocol Broadcom registered
[    8.140345] Bluetooth: HCI UART protocol QCA registered
[    8.140346] Bluetooth: HCI UART protocol AG6XX registered
[    8.140353] Bluetooth: HCI UART protocol Marvell registered
[    8.141317] Bluetooth: hci0: setting up wcn7850
...
[    9.335870] mt7925e_git 0004:01:00.0 mt0: renamed from wlan0
[   10.298232] Bluetooth: hci0: command 0xfc00 tx timeout
[   10.298495] Bluetooth: hci0: Reading QCA version information failed (-110)
[   10.298641] Bluetooth: hci0: Retry BT power ON:0
[   12.431550] Bluetooth: hci0: command 0xfc00 tx timeout
[   12.431967] Bluetooth: hci0: Reading QCA version information failed (-110)
[   12.432119] Bluetooth: hci0: Retry BT power ON:1
...
[   14.564761] Bluetooth: hci0: command 0xfc00 tx timeout
[   14.564997] Bluetooth: hci0: Reading QCA version information failed (-110)
[   14.565143] Bluetooth: hci0: Retry BT power ON:2
[   16.696488] Bluetooth: hci0: command 0xfc00 tx timeout
[   16.696679] Bluetooth: hci0: Reading QCA version information failed (-110)
[   18.829711] Bluetooth: hci0: AOSP get vendor capabilities (-110)
[   18.829831] Bluetooth: hci0: command 0xfc00 tx timeout

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