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=== 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 <code>AcpiVpc.sys</code>, 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 ===== Common causes include: ===== * Outdated or buggy Lenovo power management / ACPI drivers * BIOS–driver mismatch after a Windows update * Driver Verifier being left enabled after troubleshooting *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 ===== # Open an elevated Command Prompt # Disable Driver Verifier: ``<code> verifier /reset <syntaxhighlight>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 </syntaxhighlight> verifier </code>`<code> Ensure no settings are active unless you are debugging drivers intentionally. # Optional sanity checks </code>`<code> sfc /scannow dism /online /cleanup-image /restorehealth </code>`` ===== - 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.
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