[Bug 220237] New: Bluetooth: MediaTek MT7925 (0e8d:7925) fails to load firmware with timeout (-110)

[Bug 220237] New: Bluetooth: MediaTek MT7925 (0e8d:7925) fails to load firmware with timeout (-110)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220237

            Bug ID: 220237
           Summary: Bluetooth: MediaTek MT7925 (0e8d:7925) fails to load
                    firmware with timeout (-110)
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: are.mehus@protonmail.com
        Regression: No

Created attachment 308259
  --> https://bugzilla.kernel.org/attachment.cgi?id=308259&action=edit
Output from dmesg log

Hello,

The MediaTek MT7925 Bluetooth device (ID 0e8d:7925) consistently fails to
initialize on my Debian Trixie (Sid) system. The kernel log shows a firmware
upload timeout (-110) during the boot process.

Key Findings:

This is not a recent regression. The issue occurs on the latest experimental 
kernel (6.15) and also on an older kernel (6.12).
This is not a missing firmware issue. I have installed the latest
firmware-misc-nonfree package and have also manually updated the firmware files
from the master branch of the linux-firmware git repository.
This is not a power management issue solvable by parameters. The pcie_aspm=off
kernel parameter has no effect on the problem.
This is not a BIOS/UEFI configuration issue. Fast Boot and other aggressive
PCIe power-saving features have been disabled in the BIOS with no effect.
This appears to be a fundamental bug in the kernel driver's handling of this
hardware.

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[Bug 220237] Bluetooth: MediaTek MT7925 (0e8d:7925) fails to load firmware with timeout (-110)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220237

Are Mehus (are.mehus@protonmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |are.mehus@protonmail.com

--- Comment #1 from Are Mehus (are.mehus@protonmail.com) ---
Created attachment 308260
  --> https://bugzilla.kernel.org/attachment.cgi?id=308260&action=edit
Output from lsusb log log

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[Bug 220237] Bluetooth: MediaTek MT7925 (0e8d:7925) fails to load firmware with timeout (-110)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220237

--- Comment #2 from Are Mehus (are.mehus@protonmail.com) ---
Created attachment 308261
  --> https://bugzilla.kernel.org/attachment.cgi?id=308261&action=edit
Output from lspci log

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[Bug 220237] Bluetooth: MediaTek MT7925 (0e8d:7925) fails to load firmware with timeout (-110)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220237

--- Comment #3 from Are Mehus (are.mehus@protonmail.com) ---
Created attachment 308262
  --> https://bugzilla.kernel.org/attachment.cgi?id=308262&action=edit
Kernel version

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[Bug 220237] Bluetooth: MediaTek MT7925 (0e8d:7925) fails to load firmware with timeout (-110)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=220237

jens.nitschke@mailbox.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jens.nitschke@mailbox.org

--- Comment #4 from jens.nitschke@mailbox.org ---
Device: HP OmniBook X Flip 14-fk0178ng
BIOS: F.10 (2025-10-22)
OS: CachyOS (Arch-based)
Kernel: 7.0.3-1-cachyos
WiFi/BT chip: MediaTek MT7925 (PCIe ID: 14c3:7925, Subsystem: 8c38)
I can confirm this issue on my device. The Bluetooth USB interface never
enumerates successfully. WiFi works fine via mt7925e driver.
Key symptoms from dmesg:

usb 3-5: device descriptor read/64, error -110
xhci_hcd 0000:65:00.0: Timeout while waiting for setup device command
usb 3-5: device not accepting address, error -62

The BT device never appears in lsusb or rfkill. No hci0 interface is created.
Workarounds that had no effect:

pcie_aspm=off
usbcore.autosuspend=-1
xhci_hcd.quirks=0x80000
Early loading of mt7925e via initramfs
linux-firmware up to date, firmware files present in
/lib/firmware/mediatek/mt7925/

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