System
- ASUS ROG Zephyrus Duo 16 (GX650PY, 2023)
- AMD Ryzen 9 7945HX
- NVIDIA GeForce RTX 4090 Laptop GPU
- 32GB RAM, Windows 11 Home, version 25H2 (build 10.0.26200)
- BIOS: GX650PY.324 (13-06-2025) - latest available on ASUS support site as of this post
- Armoury Crate GPU Mode: Ultimate (dGPU only)
Symptom
Severe stutters under GPU load, especially in games like forza horizon 6, genshin impact, Neverness to everness, where winds meet,Microsoft Flight Simulator , VR (Meta Quest 3),etc. During each stutter: GPU clock, GPU power, GPU voltage, and CPU package power all dip simultaneously. Mouse and audio briefly freeze. FPS drops. No BSOD, no reboot. No WHEA/Display/Kernel-Power/PCIe errors in Event Viewer.
Issue started roughly 7-8 months ago after months of normal operation.
Diagnostics performed:
- LatencyMon captures across multiple separate test sessions consistently show high execution times in both dxgkrnl.sys (DirectX Graphics Kernel) and nvlddmkm.sys (NVIDIA driver) - these are two separate captures from two different runs, not simultaneous readings from a single session, but the issue shows up in both drivers across repeated testing. One run captured dxgkrnl.sys spiking to 125.44ms; a separate run (on driver 610.74) captured nvlddmkm.sys at 8.66ms. I only have one screenshot attached per driver since they were caught on different test passes, but both are reproducible and represent the same underlying stutter symptom, not a one-off.
- Windows Performance Analyzer (WPA): CPU Usage and DPC/ISR traces show clustered spikes in dxgkrnl.sys, nvlddmkm.sys, and (with a USB hub attached) USBXHCI.SYS, correlating with stutter windows.
- Ruled out: USB hub as sole cause (removing it reduced USBXHCI.SYS DPC time from ~21ms to ~2.4ms, but stutter persisted), NVIDIA driver version (rolled back 610.74 -> 596.49 via DDU clean install, stutter persisted), PCIe Link State Power Management (already disabled), dual-GPU/ScreenPad+ compositing overhead (ScreenPad+ is hardwired to the AMD Radeon 610M iGPU; disabling it did not resolve the issue), Windows Memory Integrity/VBS (in progress).
- 3DMark Time Spy/Steel Nomad and OCCT GPU/Power tests complete without errors; temps normal (~80-87C max).
Question / why I'm posting:
Found this repo via a Reddit/ASUS forum thread describing the ECLV/ACPI GPE self-rearm bug. My symptom profile (simultaneous GPU/CPU power dips, mouse/audio freeze, no OS-level errors) matches closely, but my traces show the stall surfacing in dxgkrnl.sys/nvlddmkm.sys rather than directly in ACPI.sys. Not sure if this is the same underlying mechanism (ACPI stall propagating up into the graphics scheduler) or a separate issue with a similar symptom - flagging in case it's useful data, or in case GX650PY needs to be added to the list of affected/tracked models.
Also confirmed: the hidden "ACPI L6D PME Handling" BIOS setting mentioned elsewhere in this repo is not exposed in the GX650PY BIOS menu (tried Ctrl+F1 hidden-menu unlock with no effect).
System
Symptom
Severe stutters under GPU load, especially in games like forza horizon 6, genshin impact, Neverness to everness, where winds meet,Microsoft Flight Simulator , VR (Meta Quest 3),etc. During each stutter: GPU clock, GPU power, GPU voltage, and CPU package power all dip simultaneously. Mouse and audio briefly freeze. FPS drops. No BSOD, no reboot. No WHEA/Display/Kernel-Power/PCIe errors in Event Viewer.
Issue started roughly 7-8 months ago after months of normal operation.
Diagnostics performed:
Question / why I'm posting:
Found this repo via a Reddit/ASUS forum thread describing the ECLV/ACPI GPE self-rearm bug. My symptom profile (simultaneous GPU/CPU power dips, mouse/audio freeze, no OS-level errors) matches closely, but my traces show the stall surfacing in dxgkrnl.sys/nvlddmkm.sys rather than directly in ACPI.sys. Not sure if this is the same underlying mechanism (ACPI stall propagating up into the graphics scheduler) or a separate issue with a similar symptom - flagging in case it's useful data, or in case GX650PY needs to be added to the list of affected/tracked models.
Also confirmed: the hidden "ACPI L6D PME Handling" BIOS setting mentioned elsewhere in this repo is not exposed in the GX650PY BIOS menu (tried Ctrl+F1 hidden-menu unlock with no effect).