OpenCL on Arc B580 (Battlemage) shows “Number of platforms: 0” on Ubuntu 24.04 (xe)

[giridhart]

Summary:
On Ubuntu 24.04 with the xe driver, clinfo loads Intel’s OpenCL ICD but reports Number of platforms: 0. No logs or personal paths attached.

Environment

• OS: Ubuntu 24.04.3 LTS
• Kernel: 6.14.0-35-generic (Ubuntu HWE)
• GPU: Intel Arc B580 (Battlemage) — PCI ID 8086:e20b
• Driver: xe (loaded successfully, no i915)
• OpenCL loader: OpenCL ICD Loader 2.3.2 (libOpenCL.so.1)
• OpenCL runtime (ICD): intel-opencl-icd 25.40.35563.7-124.04ppa1
• Level Zero: libze-intel-gpu1 25.40.35563.7-124.04ppa1, libze1 1.24.3-124.04ppa1
• GMM: libigdgmm12 22.8.2-0ubuntu124.04ppa1
• Intel GSC: intel-gsc 0.9.5-124.04ppa2
• linux-firmware: 20240318.git3b128b60-0ubuntu2.19

Steps to reproduce

sudo apt update
sudo apt install -y software-properties-common dirmngr
sudo add-apt-repository -y universe
sudo add-apt-repository -y ppa:kobuk-team/intel-graphics
sudo apt update
sudo apt install -y intel-opencl-icd libze-intel-gpu1 intel-media-va-driver-non-free clinfo intel-gsc
sudo reboot
env -u LD_LIBRARY_PATH -u LD_PRELOAD clinfo -l

Actual result

WARNING: Small BAR detected for device 0000:1b:00.0
Number of platforms 0

Expected result
Intel(R) OpenCL platform and Arc B580 device enumerate correctly.

Notes

• Using the official HWE kernel per Intel’s Ubuntu instructions.
• No output from dmesg | grep -i xe beyond module load, suggesting firmware may be missing.
• linux-firmware may be too old for Battlemage.
• The OpenCL ICD and Level Zero libraries come from the kobuk-team/intel-graphics PPA (25.40 series).

Questions

1. Which package versions (NEO/IGC/firmware) are known-good for Battlemage on Ubuntu 24.04 HWE?
2. Any specific releases are known to work?