5051dfdc8c
- modules/t490.nix: TLP power management, CPU throttling (throttled), S3 sleep, remote Nix builders (cluster), fwupd, fprintd, fprintd, Syncthing, Tailscale, Intel VA-API, TrackPoint sensitivity, PipeWire defaults - flake.nix: add nixos-hardware input, import T490 module + nixos-hardware - docs/T490-HARDWARE.md: WiFi variants, graphics, audio, fingerprint, sleep guide - docs/T490-BATTERY.md: TLP config, threshold strategy, real-world battery numbers - docs/T490-OFFLOADING.md: local vs cluster split, remote builder setup - MIGRATION.md: add T490 post-install steps (fwupd, fprint, remote build key) - README.md: reflect new module and docs structure
63 lines
2.3 KiB
Markdown
63 lines
2.3 KiB
Markdown
# T490 Hardware Compatibility
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## WiFi
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Two possible cards depending on SKU:
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- **Intel Wireless-AC 9560** (CNVio, older) — firmware: `iwlwifi-9000-pu-b0-jf-b0-*.ucode`
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- **Intel Wi-Fi 6 AX200** (M.2, discrete, newer) — firmware: `iwlwifi-cc-a0-*.ucode`
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Both use `iwlwifi` and work out of the box. If AX200 scan fails after suspend, firmware version may be the culprit. The `modules/t490.nix` includes a resume hook that reloads the module.
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## Graphics — Intel UHD 620 (Whiskey Lake)
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Single iGPU. No NVIDIA. No Optimus. Ideal for Linux.
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| Feature | Support |
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|---|---|
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| OpenGL 4.6 | Mesa Iris driver |
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| Vulkan 1.3 | Mesa ANV driver |
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| VA-API decode | H.264, H.265 8-bit, VP9 8+10-bit, MPEG-2, VC-1, VP8 |
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| VA-API encode | H.264 only (no H.265) |
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| DisplayPort over USB-C | Up to 4096×2304 @ 60Hz |
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| HDMI 1.4b | Up to 4096×2304 @ 24Hz |
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## Thunderbolt 3
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One full-speed TB3 port (also USB-C PD). `services.hardware.bolt.enable = true` in `modules/t490.nix`. Lenovo TB3 Dock Gen 2 works — update dock firmware via fwupd.
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## Fingerprint Reader — Synaptics 06cb:00bd
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Works after firmware update. Steps:
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1. `fwupdmgr refresh && fwupdmgr update` — flashes Prometheus firmware
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2. `fprintd-enroll` — enroll fingerprints
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3. Works for sudo, login, and screen unlock via PAM
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Check: `lsusb | grep 06cb` should show `06cb:00bd`.
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## Audio
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Single Intel audio card (`8086:9dc8`) with 5 sub-devices (speaker + 4 HDMI/USB-C). The nixos-hardware T490 module provides a custom PulseAudio profile set that exposes all 5 sinks simultaneously.
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## Sleep / Resume — Critical
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The T490 supports S3 (deep sleep) and S0ix (s2idle, modern standby). Lenovo removed S3 from some BIOS versions.
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**Check:**
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```
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cat /sys/power/mem_sleep
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```
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| Output | Status | Action |
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|---|---|---|
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| `s2idle [deep]` | S3 default | Good |
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| `[s2idle] deep` | S3 exists but not default | Already fixed in `modules/t490.nix` (`mem_sleep_default=deep`) |
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| `[s2idle]` | S3 missing | Troubleshoot below |
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**If S3 is missing:**
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1. BIOS → Config → Power → Sleep State → "Linux" (re-enables S3 on some versions)
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2. Downgrade BIOS (pre-2020 versions have S3)
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3. Use hibernation instead (more reliable than s2idle)
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**Sleep battery drain:**
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- S3 (deep): ~0.5%/hour (~8 days on a 50 Wh battery)
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- s2idle: ~2-4%/hour (1-2 days)
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