Fix OpenCL/GPU Acceleration for AMD Radeon on Ubuntu

Problem

Video editors had broken GPU acceleration. clinfo showed 0 platforms despite ROCm being installed.

Cause

ROCm OpenCL ICD (Installable Client Driver) was missing — /etc/OpenCL/vendors/ was empty.

Fix

sudo apt install rocm-opencl-icd

This creates /etc/OpenCL/vendors/amdocl64.icd.

Verification

clinfo | grep -E "Platform Name|Device Name|Device Board"

Originally documented ~Dec 2025.