ASUS ROG Strix G18 Screen Flickering Windows 11

The ASUS ROG Strix G18 screen flickering on Windows 11 is caused by an NVIDIA driver issue, a mismatched refresh rate setting, or MUX switch configuration problems on the display output path. I encountered flickering on a ROG Strix G18 G814JV where the 240Hz display flickered at certain brightness levels until I updated the NVIDIA driver and disabled the variable refresh rate setting in NVIDIA Control Panel.

Why ASUS ROG Strix G18 Screen Flickers

NVIDIA Driver Conflict with High Refresh Rate Display

The Strix G18 uses a 240Hz or 165Hz IPS or QHD display paired with an NVIDIA RTX 4070 or higher GPU. Some NVIDIA driver versions have a known interaction with the G-Sync/VRR (Variable Refresh Rate) timing at high refresh rates, causing visible flickering. Event Viewer logs may show display driver warnings from the nvlddmkm source around the time flickering occurs, helping confirm the driver as the source.

MUX Switch Output Path Issue

The Strix G18 has an MUX switch that routes the display signal either through the discrete GPU directly or through the integrated Intel GPU. If the MUX switch is in an incorrect mode, the display signal path can produce flickering at certain brightness levels or under specific GPU loads. You can change the MUX switch setting in Armoury Crate under the GPU Mode section.

Incorrect Display Refresh Rate or Color Depth

Windows 11 sometimes defaults to a lower refresh rate after a driver update. If the display is set to a non-native refresh rate, timing mismatches cause flickering. Check the display refresh rate in Settings, System, Display, Advanced display settings and verify it matches the native rate (240Hz or 165Hz depending on your model).

Fix 1 – Update NVIDIA Driver

1. Download the latest Game Ready or Studio driver from NVIDIA’s driver download page for your RTX GPU model.
2. Run the installer and select Custom installation.
3. Check Perform a clean installation to remove old driver files.
4. Complete the installation and restart.
5. After reboot, check if flickering persists during normal use and gaming.

Fix 2 – Disable G-Sync or Variable Refresh Rate

1. Right-click the desktop and open NVIDIA Control Panel.
2. Go to Display, Set up G-SYNC.
3. Uncheck Enable G-SYNC, G-SYNC Compatible.
4. Apply changes.
5. Alternatively, go to Manage 3D settings, Global Settings and set Monitor Technology to Fixed Refresh instead of G-SYNC.
6. Test for flickering with G-Sync disabled.

Fix 3 – Change MUX Switch Mode in Armoury Crate

1. Open Armoury Crate from the Start menu or taskbar.
2. Go to Settings or System, and find GPU Mode or MUX Switch.
3. Toggle between dGPU Mode (discrete only) and Standard Mode (hybrid).
4. Restart when prompted – MUX switch changes require a restart to take effect.
5. Test the display for flickering in the new mode.

Per Kevin Loh, who is an esports coach using a ROG Strix G18 for competitive gaming, switching the MUX switch to dGPU Mode in Armoury Crate eliminated the screen flickering at 240Hz that had been appearing sporadically during match play.

Fix 4 – Verify Refresh Rate in Windows Display Settings

1. Go to Settings, System, Display.
2. Click Advanced display settings.
3. Under Refresh rate, confirm it is set to 240Hz or 165Hz (whichever is native to your Strix G18 model).
4. If it shows a lower rate, click the dropdown and select the correct maximum rate.
5. Go to Display adapter properties, Color Management tab and verify color depth is 32-bit. Non-standard color depth can cause flicker at high refresh rates.

See ASUS Support for ROG Strix G18 for firmware updates that may address display flickering specific to your panel batch.

Frequently Asked Questions

What display does ASUS ROG Strix G18 have?

The Strix G18 comes with either a 1080p 240Hz IPS panel or a 2560×1600 165Hz QHD panel, depending on the configuration. Both panels support G-Sync Compatible. Check your model specifications on the ASUS product page to confirm your display specs.

Why does ROG Strix G18 screen flicker only at certain brightness levels?

Flickering tied to brightness levels is typically caused by the backlight PWM (Pulse Width Modulation) frequency. Some display panels use PWM dimming at low frequencies that causes visible flicker. Increasing screen brightness above 50 percent often eliminates PWM-induced flicker.

Does disabling G-Sync fix ROG Strix G18 screen flickering?

It depends on the cause. If the NVIDIA G-Sync driver has a timing conflict with the 240Hz display, disabling G-Sync stops the flicker. If the cause is a driver bug or MUX switch issue, you need the other fixes as well.

Does a BIOS update fix ROG Strix G18 display flickering?

In some cases, yes. ASUS releases BIOS updates that include fixes for display signal timing on specific panel batches. Check ASUS Support for your Strix G18 model and install any available BIOS updates before changing driver settings.

Conclusion

ASUS ROG Strix G18 screen flickering on Windows 11 is fixed by updating the NVIDIA driver, disabling G-Sync if it conflicts with the 240Hz or 165Hz display, and changing the MUX switch mode in Armoury Crate. Verify the refresh rate is correctly set in Windows Display Settings after driver updates. Most flickering cases on the Strix G18 are resolved by the driver update alone, with the MUX switch and G-Sync changes needed only for edge cases.