Missing vendor/product/sku specific ISH firmware for Dell laptops

Somehow I feel there is a bug in update-initramfs.

So after install custom blobs:

$ ls -l|awk '/->/ {print $9 " " $10 " " $11}'
ish_lnlm_39ceeaf8_0f095bd1.bin.zst -> ish_lnlm_39ceeaf8_58.7724.2.bin.zst
ish_lnlm_39ceeaf8_27e280ea.bin.zst -> ish_lnlm_39ceeaf8_58.7724.2.bin.zst
ish_lnlm_39ceeaf8_2d924439.bin.zst -> ish_lnlm_39ceeaf8_58.7724.2.bin.zst
ish_lnlm_39ceeaf8_46171bac.bin.zst -> ish_lnlm_39ceeaf8_58.7724.2.bin.zst
ish_lnlm_39ceeaf8_793c79e4.bin.zst -> ish_lnlm_39ceeaf8_58.7724.2.bin.zst
ish_lnlm_39ceeaf8_916dce72.bin.zst -> ish_lnlm_39ceeaf8_58.7724.2.bin.zst
ish_lnlm_39ceeaf8_af74be99.bin.zst -> ish_lnlm_39ceeaf8_58.7724.2.bin.zst
ish_lnlm_39ceeaf8.bin.zst -> ish_lnlm_39ceeaf8_58.7724.2.bin.zst
ish_lnlm_39ceeaf8_d8738e0f.bin.zst -> ish_lnlm_39ceeaf8_58.7724.2.bin.zst
ish_lnlm.bin.zst

The custom blob is not loaded unless one symlink it as the default ish_lnlm.bin.zst:

[ 1.508997] intel_ish_ipc 0000:00:12.0: ISH loader: load firmware: intel/ish/ish_lnlm.bin
[ 1.534957] intel_ish_ipc 0000:00:12.0: ISH loader: firmware loaded. size:829952
[ 1.534959] intel_ish_ipc 0000:00:12.0: ISH loader: FW base version: 5.8.0.7724
[ 1.534961] intel_ish_ipc 0000:00:12.0: ISH loader: FW project version: 58.7724.2.12658

And from update-initramefs messages, custom blobs are not included into initramfs and therefore not detected:

$ update-initramefs -v -u -k $(uname -r)
...
dracut-install: Missing firmware intel/ish/ish_*.bin for kernel module intel_ish_ipc
dracut-install: mkdir '/var/tmp/mkinitramfs_9uk7FI/lib/firmware/intel/ish'
dracut-install: cp '/lib/firmware/intel/ish/ish_lnlm_39ceeaf8_58.7724.2.bin.zst' '/var/tmp/mkinitramfs_9uk7FI/lib/firmware/intel/ish/ish_lnlm_39ceeaf8_58.7724.2.bin.zst'
dracut-install: ln -s 'ish_lnlm_39ceeaf8_58.7724.2.bin.zst' '/var/tmp/mkinitramfs_9uk7FI/lib/firmware/intel/ish/ish_lnlm.bin.zst'
...

$ find /lib/modules/$(uname -r) -name \*.ko.zst -exec bash -c "m=\$(basename "{}"); m=\${m%%.*}; modinfo \$m|grep '^firmware:.*\*'" \;
firmware: brcm/brcmbt4388*.ptb
firmware: brcm/brcmbt4388*.bin
firmware: brcm/brcmbt4387*.ptb
firmware: brcm/brcmbt4387*.bin
firmware: brcm/brcmbt4378*.ptb
firmware: brcm/brcmbt4378*.bin
firmware: brcm/brcmbt4377*.ptb
firmware: brcm/brcmbt4377*.bin
firmware: intel/ish/ish_*.bin
firmware: ath11k/WCN6855/hw2.1/*
firmware: ath11k/WCN6855/hw2.0/*
firmware: ath11k/QCN9074/hw1.0/*
firmware: ath11k/QCA6390/hw2.0/*
firmware: brcm/brcmfmac*-sdio.*.bin
firmware: brcm/brcmfmac*-sdio.*.txt
firmware: brcm/brcmfmac*-pcie.*.txcap_blob
firmware: brcm/brcmfmac*-pcie.*.clm_blob
firmware: brcm/brcmfmac*-pcie.*.bin
firmware: brcm/brcmfmac*-pcie.*.txt
firmware: brcm/brcmfmac*-pcie.txt

In source code for /usr/lib/dracut/dracut-install, that is, source package dracut, file src/install/dracut-install.c, function install_firmware:

  _asprintf(&fwpath, "%s/%s", *q, value);

  if (strpbrk(value, "*?[") != NULL
      && access(fwpath, F_OK) != 0) {
          size_t i;
          _cleanup_globfree_ glob_t globbuf;

          glob(fwpath, 0, NULL, &globbuf);
          for (i = 0; i < globbuf.gl_pathc; i++) {
                  ret = install_firmware_fullpath(globbuf.gl_pathv[i]);
                  if (ret == 0)
                          found_this = true;
          }

So when value has "intel/ish/ish_*.bin", it's supposed to go through the glob loop. Yet the test `access(fwpath, F_OK)` will return fail, because now all the bin files are compressed and their filenames do not have ".bin" at the end. And even one fixed that access call, the glob loop is done with ".bin" suffix, too. This means everything in this if-block has to be written.

This still affects the latest Debian release, as well as the upstream (https://github.com/dracut-ng/dracut-ng) main branch.

Filed dracut upstream bug https://github.com/dracut-ng/dracut-ng/issues/1150 and launchpad bug 2095518.

dracut fix merged in upstream and landed to Ubuntu noble-proposed/oracular-proposed/plucky. Awaiting for a formal binary release from vendor.

@vicamo do you know when Dell plan to release those firmwares ?

SRU:
* https://kernel.ubuntu.com/forgejo/kernel/linux-firmware/pulls/229 (questing)
* https://kernel.ubuntu.com/forgejo/kernel/linux-firmware/pulls/230 (plucky)
* https://kernel.ubuntu.com/forgejo/kernel/linux-firmware/pulls/231 (noble)