Two related fixes to make the System Information page reliably show real
GPU info instead of misleading lspci BAR0 readings or N/A.
1. Generalize bogus-VRAM detection to AMD.
Same root cause as #835 (NVIDIA showing 32 MB), this time for AMD: lspci
parses the first PCI memory Region (BAR0, typically 1-16 MiB on Navi
cards) as `vram`. On NOMAD8 (Threadripper 3960X + Radeon RX 6800), the
System Information page showed "1 MB" instead of "16 GB". PR #850 fixed
this for NVIDIA by clearing the bogus value and re-running the Ollama
log probe; the check was vendor-gated to NVIDIA only.
`isBogusNvidiaVram` becomes `isBogusDgpuVram` with a `isDiscreteGpuVendor`
helper matching /nvidia|advanced micro devices|amd|ati/i. Same 256-MiB
threshold — no real discrete GPU has less than that, while Intel iGPUs
(which legitimately report small shared-memory VRAM via lspci) are left
untouched. The probe gate condition is similarly renamed.
2. Read Ollama logs from the startup window, not tail:N.
`getOllamaInferenceComputeFromLogs()` was reading the last 500 log lines
and grepping for the "inference compute" line. That line is written once
during Ollama's GPU discovery phase within seconds of startup. Under
active embedding workloads we measured >1000 log lines/min, which pushes
the line past any reasonable tail within minutes — at which point the
probe returns null and the UI flips to "GPU Not Accessible" even though
Ollama is happily using the GPU (size_vram > 0 in /api/ps).
Switch from `tail: 500` to `since: containerStartedAt, until:
containerStartedAt + 300s`. The 5-minute window is bounded regardless of
container uptime and always captures Ollama's GPU discovery output. The
inference-compute line is emitted in the first few seconds of startup, so
5 min is generous headroom.
Validated on NOMAD8 (RX 6800, container uptime ~10 min with sustained
ingestion that generated 6,345 log lines):
Before:
controllers[0]: { model: "Navi 21 ...", vram: 1 }
After (bogus AMD VRAM cleared, log probe stale due to tail:500 churn):
controllers[0]: { model: "Navi 21 ...", vram: null }
gpuHealth: { status: "passthrough_failed" }
-> UI shows "N/A" and the banner from PR #208
After (bogus cleared + log probe reads startup window):
controllers[0]: { model: "AMD Radeon RX 6800", vram: 16384 }
gpuHealth: { status: "ok", hasRocmRuntime: true, ollamaGpuAccessible: true }
-> UI shows "16 GB", no banner
Both branches of the fix exercise correctly: NVIDIA path unchanged
(same code, just renamed identifiers), AMD path now triggers the probe
and the probe reliably finds the GPU info regardless of container age.
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