Openai/696fd677-90ec-800b-a423-9848e9b171f0

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gpt-5-2

User: Diagnosed that error

Diagnosed that error

Assistant: That screen shows a Windows Blue Screen of Death with this key information:

That screen shows a Windows Blue Screen of Death with this key information:

Stop code: DRIVER_VERIFIER_IOMANAGER_VIOLATION (0xC9) What failed: AcpiVpc.sys

- Driver Verifier is enabled and has detected a serious driver bug.

• The crash was triggered by AcpiVpc.sys, which is not a Windows core driver. It is almost always part of an OEM power / ACPI / system control driver, commonly seen on Lenovo laptops (ACPI Virtual Power Controller / Power Management).

In short: 👉 A faulty or incompatible OEM ACPI/power driver is misbehaving under Driver Verifier.

Common causes include:

• Outdated or buggy Lenovo power management / ACPI drivers
• BIOS–driver mismatch after a Windows update
• Driver Verifier being left enabled after troubleshooting
• Corrupted system driver stack

1. Boot into Safe Mode

1. Open an elevated Command Prompt
2. Disable Driver Verifier: `` verifier /reset

   4. Reboot
   
   This alone often stops the crashes.
   
   ===== 1. Update or reinstall Lenovo system drivers - Lenovo Power Management / Energy Management - Lenovo ACPI / VPC / Hotkey / System Interface drivers (Best sourced from Lenovo Support for your exact model) =====
   # Update BIOS/UEFI - ACPI issues are frequently BIOS-related
   # Check for leftover Verifier usage

   verifier ` Ensure no settings are active unless you are debugging drivers intentionally.
3. Optional sanity checks ` sfc /scannow dism /online /cleanup-image /restorehealth ``

- The crash dump would clearly show AcpiVpc.sys violating I/O rules.

• WinDbg typically flags it immediately under !analyze -v.

This is not hardware failure.

It’s a bad OEM ACPI/power driver being caught by Driver Verifier.

If you want, tell me:

• Laptop model
• Windows version
• Whether this happened after an update

I can give you the exact driver package that usually fixes it.

Assistant: Thanks, that extra context is important.

Thanks, that extra context is important. With multiple different bugchecks after partial improvement, we can narrow this down pretty confidently.

You’ve now seen:

• DRIVER_VERIFIER_IOMANAGER_VIOLATION (0xC9) → AcpiVpc.sys
• UNEXPECTED_KERNEL_MODE_TRAP
• DRIVER_IRQL_NOT_LESS_OR_EQUAL

This combination strongly points to a low-level driver corrupting kernel memory, not a single random failure.

Key observations:

• Reinstalling the ACPI/VPC driver made things more stable → confirms it was involved.
• New bugchecks appearing afterward → suggests another kernel driver is still bad, or the ACPI stack is still mismatched with firmware.
• These are classic symptoms of either: 1. Remaining bad OEM driver(s), or 2. BIOS + chipset + ACPI driver version mismatch, or 3. RAM corruption being triggered by drivers (less common, but possible)

1. Incomplete Lenovo driver stack cleanup - Old power / hotkey / system interface drivers still loaded - Windows Update sometimes installs a new ACPI driver over an old BIOS

1. BIOS too old for current Windows build - ACPI.sys + OEM ACPI drivers are very sensitive to firmware - This causes random IRQL and kernel trap crashes
2. Chipset driver inconsistency - Intel/AMD chipset drivers not aligned with BIOS version
3. RAM (only if everything else checks out) - Usually produces even more random bugchecks, but Driver Verifier tends to expose it

####

You want stability first.

verifier /reset

Reboot and confirm crashes still happen without Verifier.

This is not optional in your situation.

• Get the latest BIOS for your exact model
• ACPI-related crashes often disappear immediately after this

Do not rely on Windows Update.

Reinstall (or update) these specifically:

• Lenovo Power Management / Energy Management
• Lenovo ACPI / VPC / System Interface Foundation
• Lenovo Hotkey / Utility / Features Integration
• Chipset drivers (Intel or AMD, from Lenovo first)

If Lenovo provides a “System Interface Foundation” package, that one is especially important.

After reboot:

• Install the latest chipset driver that matches the new BIOS
• Reboot again

- Run MemTest86 (at least 2 full passes)

• This is a last check, not the first suspect

- Not malware

• Not GPU failure
• Not Windows “just being buggy”
• Very unlikely to be CPU failure

You’re dealing with a kernel driver + firmware mismatch, not random instability. The fact that reinstalling one driver helped already is a huge clue.

If you tell me:

• Exact laptop model
• CPU (Intel/AMD)
• Windows version/build

I can tell you exactly which Lenovo packages to install and in what order, and whether your BIOS is a known offender.

User: If bitlocker is enabled in Windows, is it still possible to get into safemode?

If bitlocker is enabled in Windows, is it still possible to get into safemode?

Assistant: Yes.

Yes. Safe Mode is still accessible when BitLocker is enabled, but there is one important condition.

BitLocker protects the disk, not the Windows boot menu. Safe Mode itself is not blocked. What can happen is that BitLocker asks for the recovery key before Windows finishes booting.

Here’s how it works in practice.

If you enter Safe Mode in a normal, expected way (for example through Windows settings), Windows usually unlocks the drive automatically using the TPM, and you will not be prompted for the recovery key.

If you trigger Safe Mode in a way BitLocker considers a “boot change” (for example interrupting boot multiple times, changing boot order, enabling Driver Verifier, or using some advanced boot options), BitLocker may switch to recovery mode and ask for the 48-digit recovery key. This is expected behavior, not a problem.

Ways to get into Safe Mode with BitLocker enabled:

1. From within Windows (most reliable)

• Settings → System → Recovery → Advanced startup → Restart now
• Troubleshoot → Advanced options → Startup Settings → Restart
• Press 4 (Safe Mode) or 5 (Safe Mode with Networking)

This usually does not trigger BitLocker recovery.

1. From the sign-in screen

• Hold Shift → select Restart
• Same menu path as above

May or may not ask for the recovery key.

1. Using msconfig

• Run msconfig
• Boot tab → Safe boot
• Reboot

This often does trigger a BitLocker recovery prompt. Make sure you have the key before doing this.

1. Forced recovery (boot failures)

• Interrupting boot 2–3 times
• Automatic Repair

Almost guaranteed to ask for the recovery key.

Important safety notes:

• If you do not have the BitLocker recovery key, do not use msconfig or force recovery.
• You can retrieve the key from: - Your Microsoft account (most common) - Printed copy / USB (if you saved one) - Your organization’s IT (if it’s a work device)

Bottom line: ✔ BitLocker does not block Safe Mode ⚠ You may need the recovery key depending on how you enter it

If your goal is Safe Mode to troubleshoot the crashes you’re seeing, the Advanced Startup method from within Windows is the safest path.

Assistant: Good result — and it tells us something useful.

Good result — and it tells us something useful.

What that SFC result means

• “Windows Resource Protection did not find any integrity violations” means: - Core Windows system files are clean - ntoskrnl.exe, hal.dll, core drivers, etc. are not corrupted - This effectively rules out OS corruption as the cause of your BSODs

Given the crashes you’re seeing, this strongly reinforces that the issue is driver / firmware related, not Windows itself.

Important detail You ran SFC offline (/offbootdir / /offwindir), which is actually better for reliability in crash scenarios. So this is a solid check, not a weak one.

What this narrows it down to Since:

• SFC is clean
• Reinstalling the ACPI/VPC driver improved stability
• You’re still getting IRQL_NOT_LESS_OR_EQUAL and UNEXPECTED_KERNEL_MODE_TRAP

The remaining suspects are:

1. Another bad kernel driver (very likely)
2. BIOS / firmware mismatch (still highly likely)
3. Chipset driver mismatch
4. RAM (possible, but lower priority right now)

Next steps (in order, no guessing)

1. Confirm Driver Verifier is OFF `` verifier /query ` If anything is active: ` verifier /reset

   2. Update BIOS/UEFI This is the single most important remaining step for ACPI-related crashes.
   # Reinstall chipset drivers - From the laptop manufacturer first - Then only update via Intel/AMD if recommended
   # Check minidumps (if they exist) If you have files in:

   C:\Windows\Minidump `` the crash culprit can usually be identified conclusively.
2. Only if crashes persist after all of the above - Run MemTest86 (2 passes minimum)

What you should NOT do now

• Don’t reinstall Windows
• Don’t disable random drivers
• Don’t assume hardware failure yet

If you want, tell me:

• Exact laptop model
• CPU (Intel or AMD)
• Windows 10 or 11 (and build if you know it)

At this point, we’re very close to pinning the exact remaining offender.

Assistant: Perfect — that model detail lets us be very specific now.

Perfect — that model detail lets us be very specific now.

You’re on a Lenovo IdeaPad Slim 5i, Intel i5 13th-gen H-series, Windows 11. This combination has a known sensitivity to ACPI + firmware + chipset alignment, especially after Windows 11 updates.

At this point, your issue is almost certainly not Windows, and almost certainly not random hardware failure.

What is actually going wrong (plain diagnosis)

Your crashes are being caused by Lenovo ACPI / power-management drivers not matching the BIOS and Intel chipset stack.

AcpiVpc.sys is part of Lenovo’s ACPI Virtual Power Controller. On 12th/13th-gen Intel systems, this driver must match:

• BIOS version
• Lenovo System Interface Foundation
• Intel Chipset Device Software

When one of those is out of sync, you get exactly:

• DRIVER_VERIFIER_IOMANAGER_VIOLATION
• IRQL_NOT_LESS_OR_EQUAL
• UNEXPECTED_KERNEL_MODE_TRAP

SFC being clean confirms this is not OS corruption.

The correct fix (order matters — do not skip steps)

1️⃣ Make sure Driver Verifier is OFF

From normal Windows (or Safe Mode if needed):

verifier /reset

Reboot.

This prevents false crashes while fixing the root cause.

2️⃣ Update BIOS first (critical)

Go to Lenovo Support → your exact Slim 5i model → BIOS.

• Install the latest BIOS/UEFI
• Plug in AC power
• Do not interrupt

This step alone fixes many ACPI crashes on this model.

3️⃣ Install Lenovo System Interface Foundation (mandatory)

On Lenovo’s driver page, download and install:

• Lenovo System Interface Foundation

This package provides the correct ACPI hooks that AcpiVpc.sys depends on.

Reboot.

4️⃣ Install Lenovo Power / VPC / Hotkey drivers

Install only from Lenovo, not Windows Update:

• Lenovo Power Management / VPC driver
• Lenovo Hotkey / Function Keys (if listed)

Reboot again.

5️⃣ Reinstall Intel Chipset drivers

From Lenovo’s site (preferred), or Intel if Lenovo doesn’t list a newer one:

• Intel Chipset Device Software
• Intel Management Engine (ME)

Reboot.

What NOT to do

• ❌ Do not reinstall Windows
• ❌ Do not use generic ACPI drivers
• ❌ Do not mix Lenovo + random OEM utilities
• ❌ Do not re-enable Driver Verifier yet

If (and only if) crashes still happen after all of this

At that point, do one of the following:

• Run MemTest86 (2 full passes)
• Or enable Driver Verifier again to identify the last remaining bad driver

But in practice, on this exact Lenovo + 13th-gen Intel setup, BIOS + System Interface Foundation fixes it ~90% of the time.

Bottom line

Your system is not dying. You’re fixing a known Lenovo ACPI/firmware mismatch.

If you want, tell me:

• BIOS version before/after update
• Whether crashes stop after Step 3

I can adjust the remaining steps precisely if needed.