This bug is marked "Fix Released" but the fix is incomplete. The .zst
handling was added only to the add_firmware() function and was never
extended to the module inclusion code path.
Confirmed on Linux Mint 22.3 (Ubuntu Noble/24.04 base), kernel
6.17.0-29-generic, nvidia-dkms-580 (580.159.03):
$ grep -A 10 -B 10 "zst" /usr/share/initramfs-tools/hook-functions
# Returns an error if no such firmware file can be located and DESTDIR doesn't
# already contain any matching file. (It is up to the caller to figure out
# whether a warning should be printed in that case.)
add_firmware()
{
local ext firmware found_fwloc fwloc path
firmware="${1}"
for path in "updates/${version?}" "updates" "${version}" ""; do
for ext in ".xz" ".zst" ""; do
fwloc="/lib/firmware${path:+/}${path}/${firmware}${ext}"
if [ -e "${DESTDIR}${fwloc}" ]; then
# DESTDIR already contains a matching firmware
file.
return 0
fi
if [ -z "${found_fwloc}" ] && [ -e "${fwloc}" ]; then
found_fwloc="$fwloc"
fi
done
done
The .zst extension check exists only within add_firmware(), which
searches /lib/firmware/ paths. There is no corresponding .zst handling
in the module inclusion code path.
The result: DKMS installs modules as .ko.zst (following
CONFIG_MODULE_COMPRESS_ZSTD from the kernel config), but initramfs-tools
module inclusion does not find them. DKMS-managed modules are absent
from the initramfs. This has been confirmed across every kernel from
6.8.0-50-generic through 6.17.0-29-generic, with one exception
(6.11.0-26-generic, which briefly installed uncompressed .ko files).
The workaround is to manually decompress the .ko.zst files and rebuild
the initramfs after each kernel upgrade. This is documented in Launchpad
bug #2154307.
The fix needs to extend .zst awareness to the module inclusion path in
hook-functions, parallel to what was done for add_firmware().
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https://bugs.launchpad.net/bugs/1932329
Title:
Support compressed kernel modules in initramfs-tools and kernel
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