bootfail_cause: it's a "silicon lottery" — slightly faster hardware expects faster response times, and the BIOS timeout is too tight for some units. Explains why some machines are affected and others aren't. HP force-pushed the broken BIOS as a "Critical" update via Windows Update — automatically, without consent. Multiple users report machines bricked overnight. ### Affected Models | Model | Broken BIOS | Working Fallback | Fix | |-------|------------|-----------------|-----| | EliteBook X G1a | 01.03.11, 01.05.00 | 01.02.05 | 01.05.01 (sp170213) ✅ | | ZBook Ultra G1a | 01.04.03, 01.04.05 | 01.03.11 | Pending — fix not yet merged | ### Workarounds 1. Network BIOS downgrade — Enter BIOS → Update via Network → downgrade step-by-step (01.04.05 → 01.04.03 → 01.03.11). Requires HP USB-C to Ethernet dongle — other brands may not be recognized by BIOS. WiFi option doesn't work. 2. CMOS drain + Win+V — Hold power button 30 sec (fans ramp up twice), then hold Win+V during boot ~15 sec. Temporary workaround to get into Windows. 3. Lock BIOS version — After downgrading, disable "Let OS update the BIOS" in BIOS settings. 4. USB media downgrade — sp165722.exe (01.03.02) available on HP FTP, but 01.03.02 causes kernel crashes for some. 01.03.11 is the "gold" fallback but only via network. 5. Secure Boot corruption — Some users found Windows CA certs unchecked after the freeze. Re-enabling got them booting. 6. BIOS 01.05.01 — Fixes EliteBook. Available at ftp.hp.com/pub/softpaq/sp170001-170500/sp170213.exe. Minor audio crackling on boot reported by some. ### Linux BIOS Update Method (No Windows Needed) - Run Windows .exe in Wine to extract firmware files - Copy to /boot/efi/EFI/HP/DEVFW/firmware.bin - Reboot → enter BIOS → "Update System Firmware" → select local media - First attempt after EFI partition change may hang (fans at full speed) — power off/on, retry --- ## 🟠 ISSUE 2: Fan Spikes / Constant On-Off Cycling Original bug (BIOS 01.03.00+): Fans spike to 100% RPM for a few seconds then stop, even on idle. Partial fix (BIOS 01.04.03+): Fans no longer hit 100%, but now constant on/off cycling at low RPM — off → low rpm → off → low rpm, many times per minute. Motor clicks audible each time. Worsens fan longevity. BIOS workaround: Set fan curve to 10/15 in BIOS to keep fans always-on at low speed. On AC, there's an explicit "always on" option. No equivalent option on battery. C-State hypothesis (Level1Techs): HP's BIOS triggers fans when CPU exits deep C-states (C2/C3). Disabling C2/C3 with cpupower idle-set reduces spin-ups but increases power consumption. YouTube background hack: Playing a YouTube video in Firefox in the background (even muted) keeps fans stable — power goes from 3W to 4W but the fan on/off loop doesn't trigger. --- ## 🟠 ISSUE 3: AiMT BIOS Setting Bricks the Laptop In BIOS 1.04.03, enabling the AiMT setting causes a hard brick. Unknown what it does. Recovery: hold power 20 sec until caps lock blinks, boot, spam F10 to enter BIOS and disable it. --- ## 🟡 ISSUE 4: Third-Party Chargers / Dock Disconnects Third-party chargers keep disconnecting and losing power at random times. HP Ultra G6 dock had similar issues — partially resolved in newer BIOS. One user confirmed updating the G6 dock firmware resolved their power delivery issues. --- ## 🟡 ISSUE 5: BSODs (Separate from Boot Freeze) Daily BSODs with different error codes each time, starting from day 1. Affects 128GB models primarily. HP pulled a February BIOS that was supposed to fix this, then re-released it. Some users had to return units entirely. --- ## 🟡 ISSUE 6: QC / Hardware Defects - Right fan bearing defect — noticeable grinding/clicking noise from right fan on some units, present from first boot. Replacement fans out of stock. - Terrible assembly and QC — multiple users returned units for physical defects - Biased toward Hynix RAM — Every user who reported the boot freeze also had Hynix RAM (not Samsung). May correlate with the "silicon lottery." --- ## 🟢 Power & Thermal Data - APU idle: ~3W, total system idle ~10W (screen + 128GB RAM consume their share) - CPU max: 70W sustained, brief 80W bursts, drops to 55W after extended load - GPU max: 110-120W in high performance mode (echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level) - Battery life: ~7-8 hours light work, ~5% battery per hour at minimal use - External monitors (3x 1440p + internal): 7-15W average - Vapour chamber cooling keeps palmrest cool; good thermal management overall - PTM7950 thermal pad swap yields 8-10°C improvement (confirmed by multiple Level1Techs users) --- ## 🔵 Linux-Specific Notes - amd_iommu=off breaks deep sleep on kernels 6.18.18+ - AC wakeup trigger causes immediate wake — fix: echo disabled > /sys/devices/platform/ACPI0003:00/power_supply/AC/power/wakeup - System freezes for 1-2 sec on battery with kernel 6.19 (fixed in 6.19.8) - Fans spinning during sleep (20-30% battery drain overnight) — fixed in kernel 6.19.8 - GNOME/Wayland stutters in video playback on Debian stable — KDE and Xorg work fine - Long BIOS POST times fixed by draining battery to 0% (full charge/discharge cycle) - Webcam driver patches progressing: amd_capture renamed to amd_isp4_capture (github.com/jtsiros/amd-isp4-camera) --- ## 💀 HP's Response - Forum threads marked "Solved" prematurely - Support offers: "reinstall Windows," "send it in" - 2-month depot repair to replace motherboards — for a firmware issue HP caused - HP deleted original bug report threads from their forum - Quietly removed "Critical" tag from broken BIOS, quietly made older versions available - No official fix for ZBook yet — only EliteBook got 01.05.01 - Users filing BBB complaints, contacting Tom's Hardware/The Register - HP has a documented multi-year pattern: 2021 Victus F.10, 2023 TG01 Desktop, 2024 ProBook/EliteBook 01.17, 2025 EliteBook, 2026 ZBook — all identical bricking via firmware update - 2024 ProBook incident only resolved after Tom's Hardware and The Register coverage --- ## Sources 1. HP Forum: URGENT ZBook Ultra G1a BIOS 01.04.05 causing boot freeze 2. Reddit: ZBook Ultra G1a first-attempt boot freeze 3. Reddit: ZBook Ultra G1a fan spike issue 4. HP Forum: EliteBook X G1a BIOS upgrade stuck circle boot 5. Level1Techs: Arch SecureBoot Guide for Ryzen AI Max (HP G1a)