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pn51: update stability notes, TSC/PSP issues affect both units
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Torjus Håkestad
2026-02-22 09:25:28 +01:00
parent bb53b922fa
commit 9f7aab86a0
1 changed files with 16 additions and 5 deletions
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docs/plans/pn51-stability.md
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@@ -36,7 +36,7 @@ Two ASUS PN51-E1 mini PCs (Ryzen 7 5700U) purchased years ago but shelved due to
- Kernel warnings from boot log before freeze:
- **TSC clocksource unstable**: `Marking clocksource 'tsc' as unstable because the skew is too large` — TSC skewing ~3.8ms over 500ms relative to HPET watchdog
- **AMD PSP error**: `psp gfx command LOAD_TA(0x1) failed and response status is (0x7)` — Platform Security Processor failing to load trusted application
- pn01 showed neither of these warnings and remained stable
- pn01 did not show these warnings on this particular boot, but has shown them historically (see below)
### 2026-02-21: pn02 BIOS Update
@@ -45,9 +45,20 @@ Two ASUS PN51-E1 mini PCs (Ryzen 7 5700U) purchased years ago but shelved due to
- **PSP LOAD_TA still failing** after BIOS update
- Monitoring back up, letting it run to see if freeze recurs
### 2026-02-22: TSC/PSP Confirmed on Both Units
- Checked kernel logs after ~9 hours uptime — both units still running
- **pn01 now shows TSC unstable and PSP LOAD_TA failure** on this boot (same ~3.8ms TSC skew, same PSP error)
- pn01 had these same issues historically when tested years ago — the earlier clean boot was just lucky TSC calibration timing
- **Conclusion**: TSC instability and PSP LOAD_TA are platform-level quirks of the PN51-E1 / Ryzen 5700U, present on both units
- The kernel handles TSC instability gracefully (falls back to HPET), and PSP LOAD_TA is non-fatal
- Neither issue is likely the cause of the hard freezes — the fTPM bug remains the primary suspect
## Benign Kernel Errors (Both Units)
These appear on both units and can be ignored:
- `clocksource: Marking clocksource 'tsc' as unstable` — TSC skew vs HPET, kernel falls back gracefully. Platform-level quirk on PN51-E1, not always reproducible on every boot.
- `psp gfx command LOAD_TA(0x1) failed` — AMD PSP firmware error, non-fatal. Present on both units across all BIOS versions.
- `pcie_mp2_amd: amd_sfh_hid_client_init failed err -95` — AMD Sensor Fusion Hub, no sensors connected
- `Bluetooth: hci0: Reading supported features failed` — Bluetooth init quirk
- `Serial bus multi instantiate pseudo device driver INT3515:00: error -ENXIO` — unused serial bus device
@@ -55,8 +66,8 @@ These appear on both units and can be ignored:
## Next Steps
- Monitor pn01 stability (fTPM disabled, no other changes needed)
- Monitor pn02 stability after BIOS update
- If pn02 continues to freeze, try adding `tsc=unstable` kernel parameter
- If pn02 still freezes, may be a hardware defect on that specific unit
- Monitor both units for stability (fTPM disabled on both, BIOS updated on pn02)
- If either freezes again, try adding `tsc=unstable` kernel parameter (unlikely to help but easy to rule out)
- If freezes continue, try disabling unused hardware in BIOS (GPU, WiFi, Bluetooth, audio)
- If still freezing, may be a hardware defect
- Once stable: add second RAM stick back to pn02, reinstall with NVMe