diff --git a/report/tts-npu-spike-verdict-2026-10-19.md b/report/tts-npu-spike-verdict-2026-10-19.md
index 8093397..5646585 100644
--- a/report/tts-npu-spike-verdict-2026-10-19.md
+++ b/report/tts-npu-spike-verdict-2026-10-19.md
@@ -150,16 +150,20 @@ TTS engine today|3.84 GiB RSS, CPU|its device-resident replacement lands in that
    explicitly, so this is a one-word diff.
 3. Runtime stage: add `mesa-vulkan-drivers`. Without a Vulkan **ICD inside the image** the
    device node buys nothing — there is no `radeon_icd.json` in the container today.
-4. `frank-tts-engine.container`: `AddDevice=/dev/dri/renderD128` + `GroupAdd=keep-groups`.
+4. `frank-tts-engine.container`: `AddDevice=/dev/dri` + `GroupAdd=keep-groups` — **not**
+   `renderD128`. On this hybrid box that node is the NVIDIA card; the iGPU is
+   `renderD129` (`readlink -f /sys/class/drm/renderD129/device/driver` → `amdgpu`).
 5. Engine argv: `--device Vulkan0` — qwentts.cpp's tools take `--device <name>` at the
    pinned commit.
 
-Gate 1 is one command: `vulkan-tools` in a throwaway container off the same base with
-`/dev/dri` passed through, then `vulkaninfo` and read the `VkPhysicalDeviceMemoryProperties`
-heap sizes — no model, no load, no compute. Every package involved has a candidate on the
-host's apt (`vulkan-tools` 1.4.341, `libvulkan-dev` 1.4.341, `glslang-dev`/`glslang-tools`
-16.2.0); the build stage runs on the digest-pinned Ubuntu 24.04 base, whose versions are
-older but present.
+Gate 1 recipe, already run and **PASSED**: `mesa-vulkan-drivers` + `vulkan-tools` in a
+throwaway container off the same base, `--device /dev/dri`, then `vulkaninfo --text` and read
+the `VkPhysicalDeviceMemoryProperties` heap sizes — no model, no load, no compute. The probe
+trap: `vulkaninfo --batch` is not a flag in Ubuntu 24.04's `vulkan-tools` — it prints the help
+page and exits 1, which reads like a driver failure. Every package involved has a candidate on
+the host's apt (`vulkan-tools` 1.4.341, `libvulkan-dev` 1.4.341, `glslang-dev`/`glslang-tools`
+16.2.0); the build stage runs on the digest-pinned Ubuntu 24.04 base, whose versions are older
+but present. Script: `/home/dank/spikes/npu-tts/vk_probe.sh` on Dankclaw.
 
 Constraints that do not relax for a co-tenant: `/dev/dri` passthrough needs the ComfyUI
 pattern (`AddDevice` + `GroupAdd=keep-groups` + the world-writable udev rule) because