Add Linux workstation machine spec (acg-guru-5070)

Lenovo Legion Pro 7 with Core Ultra 9 275HX, RTX 5070 Ti,
CachyOS. Documents known GPU firmware bug and custom kernel.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/machines/acg-guru-5070.md

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+# Machine: acg-guru-5070
+
+**Hostname:** acg-guru-5070
+**Last Updated:** 2026-03-21
+
+---
+
+## Hardware Specs
+
+| Spec | Value |
+|------|-------|
+| Model | Lenovo Legion Pro 7 16IAX10H (DMI: 83F5) |
+| CPU | Intel Core Ultra 9 275HX (24 cores, up to 5.4 GHz) |
+| Memory | 32 GB DDR5 |
+| GPU | NVIDIA GeForce RTX 5070 Ti Laptop GPU (12 GB VRAM) |
+| Storage 1 | 954 GB NVMe (SK Hynix) - CachyOS root, btrfs |
+| Storage 2 | 954 GB NVMe (SK Hynix) - /home, ext4 |
+
+---
+
+## Software
+
+| Spec | Value |
+|------|-------|
+| OS | CachyOS Linux (Arch-based) |
+| Kernel | 6.19.9-1-cachyos |
+| DE | KDE Plasma 6.6.3 (Wayland) |
+| NVIDIA Driver | 595.45.04 (open kernel module) |
+| CUDA | 13.2 |
+| Python | 3.14 |
+
+---
+
+## Claude Code Environment
+
+- **Working Directory:** /home/guru/ClaudeTools
+- **User:** guru
+- **Shell:** fish
+- **Git:** Configured for Gitea (git.azcomputerguru.com)
+
+---
+
+## Network
+
+| Interface | Address |
+|-----------|---------|
+| WiFi (wlan0) | 10.3.36.218 |
+| Tailscale | 100.95.216.79 |
+
+---
+
+## Capabilities
+
+- [x] Git operations
+- [x] SSH access to infrastructure
+- [x] GrepAI semantic search (watcher running)
+- [x] Ollama local AI (qwen3:14b, codestral:22b, nomic-embed-text)
+- [x] MCP servers available
+- [x] NVIDIA GPU (CUDA compute)
+- [x] Claude Code CLI
+
+---
+
+## Known Issues
+
+### GPU Firmware Bug (RTX 5070 Ti)
+
+The RTX 5070 Ti enters an error state (NVRM rpcSendMessage 0x00000062) after ~3-5 minutes of sustained GPU compute. This is a known Blackwell/RTX 50-series GSP firmware bug on Linux (NVIDIA bug #5953411). Affects all tested drivers (580.x, 590.x, 595.x).
+
+**Impact:** GPU-accelerated ML workloads (Whisper transcription, etc.) cannot complete. GPU enters full ERR! state requiring hard power-off (warm reboot hangs with spinning symbol).
+
+**Workarounds tried (none effective):**
+- Disable Runtime D3 power management
+- Enable persistence mode
+- Lock GPU clocks
+- Power cap reduction
+
+**Status:** Waiting for NVIDIA driver fix. Heavy GPU compute delegated to Mac (M4).
+
+### Custom Kernel for Audio
+
+Running a custom-patched CachyOS kernel with the `nadimkobeissi/16iax10h-linux-sound-saga` patch for Awinic AW88399 smart amplifier support. Stock kernel has terrible speaker output. Patch is not upstreamed.
+
+---
+
+## Notes
+
+- Primary development workstation
+- GPU works fine for display, light compute, Ollama inference — only fails under sustained heavy compute (Whisper, training)
+- Sudo: NOPASSWD configured for guru user
+- Old btrfs @home subvolume on nvme0n1 (from initial install before /home was moved to nvme1n1)