The NPU path is a dead end for this payload (verdict:
report/tts-npu-spike-verdict-2026-10-19.md); the iGPU is the accelerator that
exists on this box today, and it is already shared with frank-dragoon.
- Containerfile.engine: -DGGML_VULKAN=ON, plus the three packages the door
needs to configure — libvulkan-dev, spirv-headers, and glslc, which Ubuntu's
glslang-tools does NOT ship (find_package(Vulkan COMPONENTS glslc REQUIRED)
fails without it) — and libvulkan1 + mesa-vulkan-drivers (the RADV ICD) at
runtime. No NVIDIA ICD on purpose: one Vulkan device in the enumeration is
what makes the NAME Vulkan0 safe to write down.
- tts-engine-start.sh: QWENTTS_DEVICE -> --device, default Vulkan0. A value
that is set but EMPTY passes no flag at all, which is the CPU rollback; that
is why the default is written as an -v test and not with :=, because := also
fires on an empty value and would silently undo the rollback.
- quadlet: AddDevice=/dev/dri + GroupAdd=keep-groups (a rootless container that
drops its supplementary groups enumerates no render device). The node is not
named: this host is hybrid, renderD128 is the NVIDIA card and renderD129 the
amdgpu iGPU.
- env: QWENTTS_DEVICE=Vulkan0 plus the device law in the header, including the
rollback line.
- tests: the two CPU-only assertions now assert the Vulkan shape, and a new one
pins the rollback (empty device => no --device in argv). 451/451 green.
Measured before writing any of it: the configure in the digest-pinned base
answers "Found Vulkan: ... found components: glslc" and "Including Vulkan
backend"; gate 1 (RADV GFX1151 visible to a rootless container off this base)
is recorded in the verdict report.
Frank
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