Here is a bit more information (possibly evidence) I have a Windows 11 VM (fully updated) using qemu/kvm Host Ubuntu 24.04 kernel 6.8.0-52 - Mediatek 7921 Bluetooth can be passed to the Windows guest consistently Host Ubuntu 24.04 kernel 6.11.0-17 - Mediatek 7921 Bluetooth cannot be passed to the Windows guest at all Host Ubuntu 24.04 kernel 6.11.0-19 - Mediatek 7921 Bluetooth cannot be passed to the Windows guest at all
When I try to pass Bluetooth to the Windows guest using kernels 6.11.0-17 or 6.11.0-19, Virtual Machine Manager crashes. The dialogue box offers "Wait" or "Force Quit" - neither options work and Virtual Machine manager is frozen. REISUO or REISUB also fail. I have to use System Monitor to end processes and, then, power off ungracefully. Consequently, I have to run fsck from a live session. After power off, I detach the power cable and hold the power button for 30 seconds or more to see if Bluetooth returns. Sometimes, I need to do this 2 or 3 times. I am very reluctant to use Bluetooth with 6.11 kernels and Virtual Machine Manager for fear of causing irreparable damage. I can only conclude that mt7921 and kernels newer than 6.8.0-52 are unhappy partners. Whether it is the kernel or Mediatek firmware, I really don't know. Anyway, here's hoping that this info is relevant. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2100027 Title: Bluetooth failure on reboot - Kernel 6.11.0-17 - Mediatek 7921 Status in linux package in Ubuntu: Confirmed Bug description: Using kernel 6.11.0-17, Bluetooth works on first boot. If I reboot, GUI settings shows Bluetooth Turned Off and the on/off slider is completely inactive Ubuntu 24.04.2 (fully upgraded) Gnome 46 (Wayland) GMKtec NucBox K2, AMD Ryzen™ 7 7735HS with Radeon™ Graphics × 16, Wifi and bluetooth combined Mediatek mt7921 Bluetooth both first boot and reboot, performs flawlessly with Kernel 6.8.0-52 and earlier I expected the Bluetooth adapter to be available upon a reboot with kernel 6.11.0-17 The Bluetooth adapter was inactive and could not be turned on The Mediatek card mt7921 is an internal combined wifi and bluetooth device and the wifi is unaffected in all kernels I can resuscitate the bluetooth device:- Close applications and power off Remove the power cable Press and hold the power button for more than 30 seconds Re-attach power cable Boot the PC ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: linux-image-6.11.0-17-generic 6.11.0-17.17~24.04.2 ProcVersionSignature: Ubuntu 6.11.0-17.17~24.04.2-generic 6.11.11 Uname: Linux 6.11.0-17-generic x86_64 ApportVersion: 2.28.1-0ubuntu3.3 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Tue Feb 25 17:35:46 2025 InstallationDate: Installed on 2024-04-26 (305 days ago) InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424) SourcePackage: linux-signed-hwe-6.11 UpgradeStatus: No upgrade log present (probably fresh install) --- ProblemType: Bug ApportVersion: 2.28.1-0ubuntu3.3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/seq: mark 3058 F.... pipewire /dev/snd/controlC1: mark 3062 F.... wireplumber /dev/snd/controlC0: mark 3062 F.... wireplumber CRDA: N/A CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 24.04 InstallationDate: Installed on 2024-04-26 (315 days ago) InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424) MachineType: GMKtec NucBox K2 Package: linux (not installed) ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.11.0-17-generic root=UUID=13a1f220-a4c5-4d7a-b455-718180ab846a ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 6.11.0-17.17~24.04.2-generic 6.11.11 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-6.11.0-17-generic N/A linux-backports-modules-6.11.0-17-generic N/A linux-firmware 20240318.git3b128b60-0ubuntu2.9 Tags: noble wayland-session Uname: Linux 6.11.0-17-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip kvm libvirt lpadmin plugdev sudo users _MarkForUpload: True dmi.bios.date: 04/26/2023 dmi.bios.release: 5.24 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: 104 dmi.board.asset.tag: Default string dmi.board.name: GMKtec dmi.board.vendor: GMKtec dmi.board.version: Version 1.0 dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.ec.firmware.release: 1.3 dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvr104:bd04/26/2023:br5.24:efr1.3:svnGMKtec:pnNucBoxK2:pvrVersion1.0:rvnGMKtec:rnGMKtec:rvrVersion1.0:cvnDefaultstring:ct3:cvrDefaultstring:skuK2-001: dmi.product.family: MINI dmi.product.name: NucBox K2 dmi.product.sku: K2-001 dmi.product.version: Version 1.0 dmi.sys.vendor: GMKtec To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2100027/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
