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

[bugzilla-daemon@kernel.org]

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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