Severe Audio Latency Issues on Acer Laptop Nitro AN17-42

yrz
yrz Member Posts: 1 New User

Severe Audio Latency Issues on Acer Laptop Nitro AN17-42

📌 Issue Summary

I'm experiencing severe DPC/ISR latency issues on both of my Acer laptop (AMD Ryzen 7 8845HS w/ Radeon 780M Graphics 3.80 GHz) that result in real-time audio glitches: pops, clicks, drop-outs, and buffer underruns during light audio/video usage (e.g. Zoom, DAW software, YouTube).

After extensive diagnostics using LatencyMon, I’ve identified two drivers consistently causing high latency:

  • HDAudBus.sys – Microsoft High Definition Audio Bus Driver
  • ntoskrnl.exe – Microsoft NT Kernel System Driver

Both are responsible for ISR and DPC execution times exceeding 10,000 µs, which breaks real-time performance.

🖥️ System Specifications

  • Laptop: Acer [Nitro AN17-42]
  • CPU: AMD Ryzen 7 8845HS w/ Radeon 780M Graphics 3.80 GHz
  • OS: Windows 11 (version 23H2) – fully updated
  • Audio driver: Realtek via Microsoft HDA (HDAudBus.sys)
  • Drivers: Fully updated via Acer, AMD Adrenalin 24.x, and Windows Update
  • BIOS: Latest version available on Acer support website

📊 LatencyMon Analysis

After clean boot testing, LatencyMon reports:

  • ISR routine time (HDAudBus.sys): ~10,286 µs
  • DPC routine time (ntoskrnl.exe): ~10,745 µs
  • Interrupt-to-process latency: Over 11,000 µs
  • Hard pagefaults during test: ~36,000+
  • “Your system appears to be having trouble handling real-time audio and other tasks… One or more ISR/DPC routines are executing for too long… One problem may be related to power management or throttling.”

✅ Troubleshooting Attempted

  • Updated all drivers (chipset, audio, graphics, network, etc.)
  • Disabled WiFi and Bluetooth during testing
  • Switched to Windows default audio driver
  • Power plan set to High Performance
  • BIOS updated to latest version
  • No third-party antivirus installed
  • System remains cool and idle during spikes

⚠️ Limitations

  • The BIOS does not expose CPU power management (CPPC, ASPM, SMU, or C-State options)
  • The issue occurs even with networking disabled
  • No external DAC or audio interface is in use
  • Latency spikes occur during idle time and light load

❓ Questions for Acer Support or Community

  1. Is this a known issue on Acer laptops with AMD Ryzen CPUs and HDA audio drivers?
  2. Can Acer provide a BIOS or EC update with access to power management settings (SMU/CPPC/ASPM)?
  3. Has anyone mitigated this via specific BIOS, chipset, or driver combinations?
  4. Are there known workarounds to reduce HDAudBus.sys and ntoskrnl.exe DPC/ISR latency on these systems?

💬 Final Notes

This issue significantly affects usability, especially for real-time tasks. I'm hoping to hear from others who’ve resolved this, or get guidance from Acer or AMD engineers on next steps. This is also the second machine that had this issue, the first one I had to return to vendor due to malfunctun/freeze.

Thanks in advance for any insight! Logs and LatencyMon screenshots are available on request.