Ok, skimmed through the changelog, and looks like the .zstd compression is expected.
The issue seems to be that in my case, it's expecting to find intel/ibt-19-0-4.sfi, but that's no longer included - with or without a .zstd suffix. Seems we no longer include anything above ibt-18-{xxx}. https://packages.ubuntu.com/mantic/amd64/linux-firmware/filelist (goes from ibt-18-2 to ibt-hw) vs https://packages.ubuntu.com/lunar/amd64/linux-firmware/filelist (several ibt-19-{xxx} and ibt-20-{xxx} files between ibt-18-2 and the ibt-hw files) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-firmware in Ubuntu. https://bugs.launchpad.net/bugs/2036428 Title: Intel AX201 Bluetooth not available with 20230915.gitdfa11466-0ubuntu1 Status in linux-firmware package in Ubuntu: Confirmed Bug description: After upgrading linux-firmware to 20230915.gitdfa11466-0ubuntu1, my Intel AX201 Bluetooth controller is not available post-reboot. The device itself shows up here: $ lsusb | grep -i blue Bus 003 Device 005: ID 8087:0026 Intel Corp. AX201 Bluetooth But running e.g. `dmesg | grep -i bluetooth` returns no matches, and bluetoothctl finds no controllers. Reverting to the 20230323.gitbcdcfbcf-0ubuntu1.6 package restores full functionality. n.b. Possible duplicate of LP:2036348 - I am not in a position to confirm those symptoms yet, but will update later. Running mantic pre-release on amd64: $ lsb_release -rd No LSB modules are available. Description: Ubuntu Mantic Minotaur (development branch) Release: 23.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/2036428/+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