nvidia.conf: Enable switch for experimental better frame pacing (#130)

* nvidia.conf: Enable switch for experimental better frame pacing Signed-off-by: Peter Jung <[email protected]> * nvidia.conf: GPU --> GSP Signed-off-by: Peter Jung <[email protected]> * nvidia.conf: Add info about prime configuration Signed-off-by: Peter Jung <[email protected]> * remove history Signed-off-by: Peter Jung <[email protected]> --------- Signed-off-by: Peter Jung <[email protected]>
CachyOS · Feb 6, 2025 · e1603ec · e1603ec
1 parent 859c9e2
commit e1603ec
Showing 1 changed file with 13 additions and 1 deletion.
diff --git a/usr/lib/modprobe.d/nvidia.conf b/usr/lib/modprobe.d/nvidia.conf
@@ -23,8 +23,20 @@
 # nvidia_drm.modeset=1 (default 0) - Enables modesetting support for the NVIDIA
 # driver. Critical for Wayland support and proper PRIME Offload operation.
 #
+# NVreg_RegistryDwords=RMIntrLockingMode=1 (default 0)
+# enables experimental switch for better frame-pacing
+# this mainly improves it for high refresh rate monitors with VRR or VR headsets
+# Explaination:
+# At 240Hz each frame is expected every 4ms. But if a 1ms task—say, in the kernel
+# or on the GSP — runs when a frame is about to be displayed, it can delay the rendering.
+# Instead of a neat sequence at T+4ms, T+8ms, T+12ms, the frames might appear at T+4ms,
+# T+9ms, T+12ms, etc. This shows how even small delays can shift frame timing,
+# potentially impacting smooth display output.
+# Info: This does not apply to PRIME configurations
+
 options nvidia NVreg_UsePageAttributeTable=1 \
     NVreg_InitializeSystemMemoryAllocations=0 \
     NVreg_DynamicPowerManagement=0x02 \
-    NVreg_EnableGpuFirmware=0
+    NVreg_EnableGpuFirmware=0 \
+    NVreg_RegistryDwords=RMIntrLockingMode=1
 options nvidia_drm modeset=1