the hdr looks washed out and gray in windows 11, not bright at all. did i get a bad unit?

Diagnosis

This "washed out" or gray appearance is rarely a hardware defect of the panel itself, but rather a systemic mismatch between the Windows 11 HDR metadata and the monitor's internal tone mapping. The ASUS VG28UQL1A uses an edge-lit local dimming system, which lacks the precision of Full Array Local Dimming (FALD). When Windows 11 triggers HDR mode, it often sends a signal that exceeds the monitor's actual peak brightness (roughly 400-600 nits depending on the content), causing the monitor to "clamp" the brightness, resulting in a flat, gray image where blacks look like dark charcoal instead of true black.

Furthermore, Windows 11 handles "SDR content" (your desktop, browser, and folders) differently when HDR is toggled on. It uses an internal slider to determine how bright non-HDR elements should appear. If this is set too low, your entire desktop will look dim and muted. To confirm this is a software/setting issue, launch a native HDR game or movie; if the colors pop and the brightness increases significantly, your hardware is fine, and the issue lies in the OS-level calibration and the monitor's GameVisual profile.

How to Fix It

Follow these exact steps to synchronize the OS and the hardware for maximum contrast and brightness:

1. Hardware Setup: Use the joystick on the back of the monitor to open the OSD (On-Screen Display). Navigate to GameVisual and ensure the profile is set to HDR. If it is on "Racing" or "Scenery," the HDR signal from Windows will be misinterpreted, leading to the gray wash.
2. OS Activation: Right-click your desktop, select Display settings, and toggle Use HDR to On.
3. SDR Brightness Adjustment: While still in the HDR settings menu, scroll down to SDR content brightness. This is the most critical step for fixing the "dim" look. Move the slider to approximately 60-80% until the white backgrounds of your folders match the brightness you are used to in standard mode.
4. Windows HDR Calibration App: Download the Windows HDR Calibration app from the Microsoft Store. Launch it and follow the prompts. When asked to adjust the "Minimum Luminance," move the slider until the pattern completely disappears into the black. For "Maximum Luminance," move the slider until the pattern is barely visible. This creates a custom color profile (.icc) that tells Windows exactly where the VG28UQL1A's brightness limits are, eliminating the gray haze.
5. Refresh Rate Check: Ensure your display is set to 144Hz in Advanced display settings. Lower refresh rates can sometimes trigger legacy HDR modes that look significantly worse.

If That Didn't Work

• Disable "Auto HDR" for Desktop Apps: Go to Settings > System > Display > HDR and turn off Auto HDR. While great for old games, Auto HDR can sometimes force a "fake" HDR look on standard apps, making the colors look overly saturated or unnaturally gray.
• Switch to DisplayPort 1.4: If you are using HDMI 2.0, you may be hitting bandwidth limits that force a lower color depth (8-bit instead of 10-bit). Use a certified VESA DisplayPort 1.4 cable to ensure the full HDR10 signal is transmitted without compression.
• Nvidia/AMD Control Panel Override: Open your GPU control panel. Under "Change resolution," ensure the Output color depth is set to 10 bpc and Output dynamic range is set to Full. If it is set to "Limited," the blacks will appear gray regardless of your monitor settings.
• Reset OSD Settings: If you have tweaked the brightness and contrast in the monitor's hardware menu, they may be conflicting with the HDR signal. Go to System Setup > Reset in the monitor's OSD to clear all hardware overrides.

Heads Up

• SDR vs HDR: Remember that this monitor is designed for gaming. Using HDR for general web browsing or office work is generally not recommended, as SDR content is natively more accurate on this panel.
• Local Dimming Limitations: Because this is an edge-lit panel, you may see "blooming" or light leakage around bright objects on a black background; this is a physical limitation of the hardware, not a defect.
• Firmware Updates: Check the ASUS support site for the latest firmware. ASUS frequently releases updates for the VG series that improve HDR tone mapping and reduce the "gray" effect in Windows 11.
• Cable Quality: Always use the cable provided in the box. Third-party HDMI cables often lack the bandwidth required for 4K 144Hz HDR, causing the screen to flicker or revert to a washed-out color space.