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Groups > linux.debian.kernel > #92576

Bug#1136945: linux: Bluetooth broken on MediaTek MT7961 (regression in 6.12.85+deb13)

Cross-posted to 2 groups.

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Control: forcemerge 1136790 1136945

Hi

On Sun, May 17, 2026 at 03:20:52PM +0200, Roman Hocke wrote:
> Package: linux
> Version: 6.12.88-1
> Severity: important
> Hardware: Lenovo IdeaPad, MediaTek MT7961 (USB ID 0e8d:e0cd)
> 
> Dear Maintainer,
> 
> Bluetooth has stopped working on my system after upgrading the kernel from
> 6.12.74+deb13+1 to 6.12.85+deb13 (and all subsequent versions up to and
> including 6.12.88+deb13, the current one). Downgrading back to
> 6.12.74+deb13+1 restores Bluetooth functionality.
> 
> -- System information --
> 
> Kernel (broken):  6.12.88+deb13-amd64
> Kernel (working): 6.12.74+deb13+1-amd64
> Bluetooth chip:   MediaTek MT7961 (USB ID 0e8d:e0cd, PCI: mt7921e,
> ASIC revision 79610010)
> Firmware package: firmware-mediatek (reinstallation did not help)
> Distro:           Debian 13 (trixie)
> 
> -- Symptom --
> 
> Bluetooth adapter is detected but fails to initialize. The following
> errors appear in dmesg on the broken kernels:
> 
>   Bluetooth: hci0: HW/SW Version: 0x008a008a, Build Time: 20241106151414
>   Bluetooth: hci0: Failed to send wmt func ctrl (-22)
>   Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is
>               advertised, but not supported.
> 
> rfkill shows no block (soft or hard). The bluetooth.service is running.
> Reinstalling firmware-mediatek had no effect.

This is already known, merging with #1136945. Please check always for
existing bugreports and followup on them.

Regards,
Salvatore

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Bug#1136945: linux: Bluetooth broken on MediaTek MT7961 (regression in 6.12.85+deb13) Salvatore Bonaccorso <carnil@debian.org> - 2026-05-17 16:10 +0200

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