Still affects jammy on a ThinkPad X260 with kernel 6.8.0-40-generic. I haven't tried the workaround yet but a `rmmod btusb; modprobe btsub` makes Bluetooth work on this notebook.
Actually, I am pretty sure it worked before and this is a more recent regression, maybe when the LTS kernel was updated from 6.5 (?) to 6.8. -- 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/1940332 Title: hci0: Failed to send firmware data (-38) Status in linux package in Ubuntu: Confirmed Bug description: This report is related to a problem reported in IRC #ubuntu whereby (Intel 8260 Wifi) Bluetooth device cannot load its firmware file at boot time but can later. Appears to be a race condition between the wifi chipset setting up the device and enabling the attached USB interface to the Bluetooth device fully. Bluetooth: hci0: Failed to send firmware data (-38) Bluetooth: hci0: Intel reset sent to retry FW download The solution is to introduce a delay in loading the 'btusb' module: echo "install btusb /usr/bin/sleep 2; /usr/sbin/modprobe --ignore- install btusb" | sudo tee -a /etc/modprobe.d/btusb.conf This imposes a 2 second delay before the 'btusb' module is loaded. Reporting user tells us this works around the problem. The code responsible is net/bluetooth/hci_request.c::__hci_cmd_sync_ev() and/or https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/bluetooth/hci_request.c#n147 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/bluetooth/hci_request.c#n234 as the result of the calls: err = wait_event_interruptible_timeout(...) since only these are followed by calls to net/bluetooth/lib.c::bt_to_errno() and that is the only function that can return -ENOSYS (-38) https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/bluetooth/lib.c#n132 default: return ENOSYS; } To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1940332/+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
