Public bug reported:
On recent Ubuntu releases (e.g. 24.04, kernel 6.11), Bluetooth support
for Intel AX200 fails during boot due to how firmware files are packaged
in the linux-firmware package.
The firmware files required by the btusb driver:
/lib/firmware/intel/ibt-19-0-4.ddc
/lib/firmware/intel/ibt-19-0-4.sfi
…are symbolic links to .zst compressed files, e.g.:
ibt-0040-0041.ddc.zst
ibt-19-0-0.sfi.zst
However, the btusb kernel module:
Cannot follow symlinks or decompress .zst files during early boot:
Bluetooth: hci0: Reading Intel version command failed (-110)
** Affects: linux-firmware (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2115563
Title:
Intel AX200 Bluetooth fails to initialize due to firmware symlinks and
.zst compression
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