Some users have reported frequent BSOD crashes, claiming that the APC index does not match the situation as the main culprit. Most affected users report that BSOD crashes occur for no apparent reason. In most cases, BSOD crashes indicating an APC index mismatch in the dump file are considered a hardware problem. However, this is not always the case.
Many programs (drivers and third-party applications) can cause a BSOD failure, leading to an APC index mismatch. A fairly common BSOD trigger for APC index mismatch is when users try to use a webcam with Skype. Other users report that they usually crash when a BSOD with an APC index mismatch occurs while playing a video game or other resource-intensive activity.
APC is an acronym for “Asynchronous Procedure Call”, a function that can run outside and apart from the main program under certain circumstances. This causes a BSOD to fail and indicates an APC index mismatch because the culprit appears after or during the boot process.
An APC index mismatch error is usually an indication that the number of processes entered into the workspace where the program is running and the number of remaining processes are incompatible. The APC index mismatch error is essentially the operating system telling you that no software can run without risking system damage – hence the BSOD (blue screen of death) crash.
If you are currently struggling with regular BSOD crashes due to an APC index mismatch, the following fixes may help. Below is a set of methods that other users in a similar situation have used to solve the problem on their end. Please follow each method in turn until you find an effective solution for your specific situation.
Disable Realtek HD Audio Manager on startup
- Reboot your computer at startup. You will need to restart it a few times before the automatic restore begins.
- Windows should start the recovery process automatically.
- Select Troubleshooting, then Advanced Options.
- Go to Startup Options and click Restart.
- After your computer restarts, a list of options will appear. Press F5 or 5 to select Safe Mode with network drivers loaded.
Once you’ve entered Safe Mode, here’s how you can prevent the problem application from running:
- Launch Task Manager (press Ctrl + Shift + Esc on your keyboard).
- Click the “Home” tab.
- You will see a list of running applications. When Realtek HD Audio Manager appears in the list, right-click it and select “Disable”. If this application is not in the list, disable all applications to run Windows 10.
- Close Task Manager and restart your computer.
Install the latest updates
- Press the Windows + I key to open the Settings app. Now go to the “Update and security” section.
- Now click the Check for Updates button.
Windows will now check for available updates. If any updates are available, they will be automatically downloaded in the background. Once you download the updates, they will be installed as soon as you restart your computer.
Several users have reported that they have solved this problem simply by installing the latest updates. So be sure to give it a try.
Remove the DisplayLink driver
People who use an extra monitor may need the DisplayLink driver. However, Windows experts warn that this particular driver can cause APC_INDEX_MISMATCH blue screen. If updating the drivers doesn’t help, find the DisplayLink driver and uninstall it.
- Press the Windows + I key and open applications.
- In the left pane, click the “Programs and Features” link.
- Find the DisplayLink Core software and click it.
- Select Uninstall.
- Find and download the DisplayLink installation cleanup tool.
- Run the tool to complete the uninstallation and restart your system.