System Interrupts sitting at 10%, 25%, or even 40% CPU in Task Manager is one of the most confusing things Windows shows you. It’s not a program. You can’t end it, you can’t uninstall it, and searching the name gives you vague answers about “hardware interrupts.” Meanwhile your HP laptop is sluggish, the fans are working, and a phantom process is eating a quarter of your processor.

Here’s the practical translation: some piece of hardware in your laptop — or more likely, its driver — is shouting at the CPU far too often, and the CPU is spending its time answering instead of running your programs. The fix is detective work: identify which device is generating the interrupt storm, then update, reconfigure, or replace the offending driver or device. It’s methodical, and it works.

Our step-by-step companion guide (System Interrupts high CPU, step by step ) walks the same diagnosis in even finer detail. For keeping drivers healthy generally, see updating drivers on a Windows 11 laptop .

Why this happens

  • Buggy or mismatched device driver: The top cause — a driver generating spurious interrupts thousands of times per second.
  • Failing storage drive: A dying SSD/HDD retrying failed operations generates interrupt storms.
  • Problematic USB device: A flaky USB peripheral (or hub/dock) spamming the USB controller with interrupts.
  • Network adapter issues: Wi-Fi or Ethernet drivers with power-management bugs interrupting constantly.
  • Outdated BIOS/chipset drivers: Low-level platform drivers mishandling device interrupts.
  • Overheating components: Thermal sensors and throttling logic generating excessive system management interrupts.
  • Recently updated (broken) driver: A Windows Update-installed driver that’s incompatible with your HP hardware.

How to fix it

Work through these in order — diagnose first, then act.

Fix 1: Measure the baseline and check for obvious triggers

Quantify the problem before changing anything.

  1. Open Task Manager, go to the Details tab, and add the CPU column if needed — note the exact System Interrupts percentage at idle, with no apps open.
  2. Test in Safe Mode (hold Shift while clicking Restart > Troubleshoot > Startup Settings > Safe Mode) — if System Interrupts is normal in Safe Mode, a third-party driver is the cause; if it’s still high, suspect hardware or core Windows drivers.
  3. Disconnect all USB devices (mouse, external drives, docks, printers) and watch the percentage for two minutes — USB devices are the quickest win when they’re the cause.
  4. Toggle Wi-Fi off and unplug ethernet separately — if interrupts drop when the network is off, the network adapter driver is your suspect.
  5. Write down your findings — “drops when USB dock removed” or “normal in Safe Mode” directs everything that follows.

Fix 2: Use LatencyMon or WPA to identify the offending driver

Pinpoint the exact driver generating interrupts.

  1. Download LatencyMon (free, from Resplendence) — run it for 5–10 minutes while the system is at idle-ish load, then check the Drivers tab sorted by ISR count and DPC count.
  2. The driver with massively higher ISR/DPC counts than the rest is your culprit — common offenders: storport.sys/stornvme.sys (storage), ndis.sys with a specific Wi-Fi driver (network), usbport.sys/usbxhci.sys (USB), HDAudBus.sys (audio).
  3. Note the exact driver filename — you’ll target it specifically in Fix 3.
  4. Alternative: use Windows Performance Recorder (wprui.exe), record 60 seconds, and analyze with Windows Performance Analyzer — more powerful but steeper learning curve.
  5. If no single driver stands out but totals are high across the board, suspect BIOS/chipset level issues — move to Fix 5.

Fix 3: Update or roll back the suspect driver

Target the driver LatencyMon identified.

  1. Open Device Manager, find the device matching the culprit driver (network adapter, storage controller, USB controller, etc.).
  2. First try updating: right-click > Update driver > Search automatically — then also check HP’s support site for your exact model’s driver, which is often better validated than the generic Windows one.
  3. If the problem started after an update, roll back instead: Properties > Driver > Roll Back Driver.
  4. For network adapters specifically, also try disabling power management: Properties > Power Management > uncheck Allow the computer to turn off this device to save power — buggy power-state transitions are a classic interrupt source.
  5. Restart and re-measure System Interrupts at idle — a fixed driver often drops it from 20%+ to under 2% immediately.

Fix 4: Update HP chipset, storage, and BIOS

The platform-level fix for HP laptops.

  1. Visit HP’s support site , enter your model, and install the latest chipset, Intel RST/storage, and BIOS updates — in that order.
  2. Use HP Support Assistant to catch anything you missed — it knows your model’s driver matrix.
  3. BIOS updates specifically fix interrupt-routing bugs (APIC/ACPI issues) that manifest as System Interrupts — keep the laptop plugged in during the flash and don’t interrupt it.
  4. After BIOS update, enter BIOS setup and check that Virtualization and power settings are at defaults — exotic BIOS tweaks can alter interrupt behavior.
  5. Re-measure — platform driver updates resolve the cases where no single device driver stood out in LatencyMon.

Fix 5: Isolate hardware faults

When drivers aren’t the answer, test the hardware.

  1. Run HP’s built-in diagnostics: restart and press F2 (or Esc > F2) to launch HP PC Hardware Diagnostics — run the comprehensive storage and system board tests.
  2. Check drive health: in Terminal, run wmic diskdrive get status — and check SMART data with CrystalDiskInfo (free). A failing drive generating retries shows up here.
  3. Test RAM: Win + R > mdsched.exe > restart and test — bad RAM causes error interrupts and bizarre system behavior.
  4. Monitor temperatures with HWMonitor or HWiNFO — sustained high temps cause thermal interrupt storms; clean dust from vents and consider new thermal paste on older machines.
  5. If diagnostics point to a specific component (drive, in particular), replace it — no driver update fixes failing hardware, and interrupt storms from dying drives only get worse.

Fix 6: Disable the problematic device as a workaround

When you need the laptop usable today.

  1. In Device Manager, right-click the suspect device > Disable device — confirm System Interrupts drops. This is diagnostic confirmation and a temporary workaround.
  2. Common candidates to test disabling one at a time: unused network adapters, the SD card reader, fingerprint reader, and specific USB controllers.
  3. If disabling the Wi-Fi adapter fixes it but you need Wi-Fi, try a USB Wi-Fi dongle as a stopgap while you sort the internal adapter’s driver.
  4. For audio-related interrupts (HDAudBus), try disabling audio enhancements: Settings > System > Sound > device properties > turn off Audio enhancements.
  5. Remember: disabling is a workaround, not a fix — circle back to proper driver repair when you have time, since disabled devices mean lost functionality.

Fix 7: Repair Windows as the final software step

For interrupt problems rooted in system corruption.

  1. Run DISM /Online /Cleanup-Image /RestoreHealth then sfc /scannow in an elevated terminal.
  2. Install all pending Windows updates — Microsoft occasionally ships interrupt-handling fixes, and updated inbox drivers may replace the broken one.
  3. Check Microsoft’s official Windows support page for known interrupt issues with your Windows build.
  4. If a specific Windows update started the problem, uninstall it (Settings > Windows Update > Update history > Uninstall updates) and pause updates while you install the manufacturer’s driver version.
  5. Last resort: an in-place repair install from the Windows 11 ISO (Microsoft’s download page ) rebuilds the driver stack while keeping your files and apps.

Closing

System Interrupts high CPU is your laptop telling you, in the only way it can, that some hardware is misbehaving. The detective work — Safe Mode test, USB isolation, LatencyMon identification — takes under an hour and almost always names the culprit. Fix that driver or device, and the phantom CPU usage vanishes as mysteriously as it appeared.

Frequently asked questions

What does the System Interrupts process actually represent?
System Interrupts isn’t a real process — it’s a placeholder Task Manager uses to account for CPU time spent handling hardware interrupts. Every hardware device (network card, USB devices, storage controller, GPU) interrupts the CPU to request attention; the time the CPU spends servicing those requests shows up as ‘System Interrupts.’ High values mean some hardware or its driver is interrupting excessively — often thousands of times per second more than normal.
Is high System Interrupts a sign my HP laptop hardware is failing?
It can be, but drivers are the far more common cause. Failing hardware (a dying drive, flaky USB device, overheating component generating thermal interrupts) does raise interrupt rates, but in most cases the culprit is a buggy or mismatched driver spamming interrupts. The diagnostic approach below distinguishes the two: if the problem disappears with a device disabled or a driver updated, it was software.
Can I end the System Interrupts process?
No — there’s nothing to end. System Interrupts isn’t executable code you can kill; it’s CPU time accounting. Ending it is impossible (Task Manager won’t even offer the option), and trying to suppress it via hacks just hides the measurement while the underlying interrupt storm continues. You must find and fix the device or driver generating the interrupts.
Why did System Interrupts spike right after a Windows update?
Windows updates frequently replace drivers with newer (or generic) versions, and a mismatched storage, network, or chipset driver can start generating interrupt storms immediately. HP laptops are particularly susceptible because Windows Update sometimes installs generic drivers over HP’s customized ones. Rolling back the recently changed driver or installing HP’s version from their support site usually resolves it.