Problem / Background

The GenericChassisReader (used on all non-macOS platforms) currently only reports aggregated GPU power. On DGX Spark (GB10) and other Linux systems, much more chassis-level information is available but not collected:

• DMI data (/sys/class/dmi/id/): product name, vendor, board name, BIOS version — all readable without sudo
• Thermal zones (/sys/class/thermal/thermal_zone*/): multiple ACPI temperature zones (inlet/outlet/board temps) — readable without sudo
• System identification: Chassis type, product version

Currently the TUI only shows "Pwr: N/A" for the chassis line, which is unhelpful.

Verified on Real Hardware (DGX Spark GB10)

Available data sources (no sudo required):

Proposed Solution

1. Collect DMI Information

In GenericChassisReader, read DMI data from /sys/class/dmi/id/ and populate ChassisInfo.detail:

• product_name → detail["Product Name"]
• sys_vendor → detail["Vendor"]
• board_name → detail["Board"]
• product_version → detail["Version"]
• bios_version → detail["BIOS Version"]

2. Collect Thermal Zone Data

Read /sys/class/thermal/thermal_zone*/temp and /sys/class/thermal/thermal_zone*/type:

• Use the lowest-index acpitz zone as inlet_temperature
• Use the highest-temp acpitz zone or last zone as outlet_temperature
• These are board-level temperatures, distinct from per-GPU temperatures

3. Ensure GPU Power Flows to Chassis

The GenericChassisReader has a gpu_power_cache mechanism but it appears the total power may not always be populated. Verify and fix the GPU power aggregation so total_power_watts shows correctly.

Acceptance Criteria

• DMI product name, vendor, and board info shown in chassis detail
• Thermal zone temperatures collected and shown (inlet/outlet)
• GPU power correctly reported in chassis total_power_watts
• No sudo required for any of the new data collection
• Graceful fallback when DMI or thermal data is unavailable
• Works on DGX Spark and generic Linux systems
• No regression on macOS chassis reader

Technical Reference

Key files:

• src/device/readers/chassis/generic.rs — Main file to modify
• src/device/readers/chassis/mod.rs — Factory function
• src/device/types.rs — ChassisInfo struct (already has inlet_temperature, outlet_temperature, detail fields)
• src/ui/renderers/chassis_renderer.rs — TUI renderer (already handles thermal display)
• src/api/metrics/chassis.rs — API exporter (already exports inlet/outlet temps)