I have verified your hypothesis regarding the device ID and the libmtp conflict. The data confirms this is indeed a duplicate of bug #2137691, caused by the MediaTek Bluetooth controller sharing an ID with legacy hardware.
1. EVIDENCE FROM MY SYSTEM: - The device is present on the USB bus with the suspect ID: $ lsusb -d 0489:e111 Bus 003 Device 005: ID 0489:e111 Foxconn / Hon Hai Wireless_Device - The conflicting MTP libraries are active: $ apt list --installed | grep libmtp libmtp-runtime/questing,now 1.1.22-1 amd64 [installed,automatic] - The device is being detected as a USB device during boot (despite the card being a PCIe combo card): $ sudo dmesg | grep -i "0489" [ 1.995870] usb 3-2.3: New USB device found, idVendor=0489, idProduct=e111 2. CORRELATION: This confirms the root cause: The existing hwdb rules (specifically 69-libmtp.hwdb) are incorrectly identifying this modern Bluetooth chip as a legacy "Lenovo IdeaTab" or "Medion LifeTab" (ID_MEDIA_PLAYER=1). The segfault in bluetoothd during session handoff and resume is almost certainly caused by libmtp attempting to mount/probe the Bluetooth controller as a storage device, causing the driver to crash. 3. PROPOSED FIX (Local Override): Since I need to retain camera functionality (I cannot simply purge libmtp), I propose applying a local hwdb override to untag this specific device. Could you confirm if the following rule is the correct approach to solve this safely until the upstream package is patched? File: /etc/udev/hwdb.d/99-fix-bluetooth.hwdb ------------------------------------------------ # Force disable MTP and GPhoto2 for MediaTek Bluetooth Chip (0489:e111) usb:v0489pE111* ID_MEDIA_PLAYER=0 ID_MTP_DEVICE=0 ID_GPHOTO2=0 GPHOTO2_DRIVER=none ------------------------------------------------ If confirmed, I will apply this, run `systemd-hwdb update` and `udevadm trigger`, and report back if it resolves the crash. ** Tags added: mt7925e -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2137719 Title: bluetoothd 5.83 segfault during GDM to Desktop session handoff on Ubuntu 25.10 (MediaTek MT7925 / GNOME 49) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/2137719/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
