Lenovo ThinkBook 16p Gen 4 HDMI 2.1 Not Working Windows 11

The HDMI port on your Lenovo ThinkBook 16p Gen 4 does not output 4K at 120Hz – the external monitor only shows 4K at 60Hz or lower, or the HDMI port shows no signal at all. The ThinkBook 16p Gen 4 has HDMI 2.1 but it requires specific GPU mode and driver configuration to deliver full 4K 120Hz output.

This guide covers NVIDIA driver setup, Discrete GPU mode, HDMI cable requirements, and NVIDIA Control Panel settings for 4K 120Hz via HDMI 2.1 on the Lenovo ThinkBook 16p Gen 4 in Windows 11.

“ThinkBook 16p Gen 4 HDMI only showed 4K 60Hz on my 120Hz gaming monitor. Updated NVIDIA driver and switched to Discrete GPU mode in Vantage. Now getting 4K 120Hz without issues.” – Amirul, programmer from Kuantan

Why HDMI 2.1 Is Limited on ThinkBook 16p Gen 4

The Lenovo ThinkBook 16p Gen 4 HDMI 2.1 port is physically connected to the NVIDIA GPU. In Hybrid mode (NVIDIA Optimus), external display output through HDMI goes through the Intel iGPU which has bandwidth limitations preventing 4K above 60Hz. Only when operating in Discrete GPU mode does HDMI 2.1 get the full 48Gbps bandwidth required for 4K 120Hz output.

• Hybrid mode routes HDMI through Intel iGPU which lacks 4K 120Hz bandwidth
• HDMI 2.0 cable used limiting maximum bandwidth to 4K 60Hz
• NVIDIA Control Panel resolution not manually set to 4K 120Hz after display detection
• NVIDIA driver version not including HDMI 2.1 4K 120Hz capability for ThinkBook 16p

Fix 1 – Switch to Discrete GPU Mode in Lenovo Vantage

Open Lenovo Vantage, go to Device – My Device Settings – Power and find GPU mode or Display settings. Switch from Hybrid to Discrete GPU mode. A restart is required. In Discrete GPU mode, the NVIDIA RTX 4060 or 4070 directly drives the HDMI 2.1 port without going through Intel iGPU, enabling full 4K 120Hz output bandwidth.

Fix 2 – Use a Certified HDMI 2.1 Cable

Purchase a certified HDMI 2.1 cable labeled 48Gbps or 8K/60Hz rated. HDMI 2.0 cables (18Gbps) cannot carry 4K at 120Hz (which requires approximately 40Gbps bandwidth). Check the cable packaging for 2.1 certification – many cables marketed as HDMI 2.0 physically appear identical to 2.1 cables but have lower bandwidth wiring. A genuine HDMI 2.1 cable is the prerequisite for 4K 120Hz.

Set 4K 120Hz in NVIDIA Control Panel

After Discrete GPU mode and correct cable, open NVIDIA Control Panel – Display – Change resolution. Select the external monitor. Click Customize and add a custom resolution: 3840×2160, 120Hz, Progressive. If 120Hz does not appear in the standard list, the custom resolution approach allows direct specification. Click Test and confirm if the monitor accepts it.

Fix 3 – Update NVIDIA Driver from Lenovo Support

Go to support.lenovo.com, enter ThinkBook 16p Gen 4 model, and download the NVIDIA GeForce driver under Display. Lenovo-qualified NVIDIA drivers include ThinkBook 16p specific HDMI 2.1 output profiles. Driver version 537 and later include updated HDMI 2.1 DSC (Display Stream Compression) support needed for reliable 4K 120Hz over HDMI on laptops.

Fix 4 – Enable VRR or G-Sync on External Monitor

If the monitor supports HDMI 2.1 VRR or G-Sync Compatible, enable it in the monitor OSD after achieving 4K 120Hz. In NVIDIA Control Panel – Display, click Set up G-Sync and enable G-Sync Compatible mode. Variable refresh rate via HDMI 2.1 VRR provides additional gaming smoothness on top of the 120Hz base refresh rate from the ThinkBook 16p Gen 4.

Frequently Asked Questions

Why is HDMI 2.1 not working on ThinkBook 16p Gen 4?

In Hybrid mode, HDMI routes through Intel iGPU which lacks 4K 120Hz bandwidth. Switch to Discrete GPU mode in Lenovo Vantage for full HDMI 2.1 performance.

How do I enable 4K 120Hz on ThinkBook 16p Gen 4 HDMI?

Switch to Discrete GPU in Vantage, use a certified HDMI 2.1 cable, update NVIDIA driver from Lenovo Support, and set 4K 120Hz in NVIDIA Control Panel.

What GPU does ThinkBook 16p Gen 4 have?

NVIDIA RTX 4060 or RTX 4070 Laptop GPU with Intel Core Ultra processor and Intel Arc integrated graphics.

Does ThinkBook 16p Gen 4 HDMI support 4K 120Hz?

Yes – HDMI 2.1 port supports 4K at 120Hz in Discrete GPU mode with a certified 48Gbps HDMI 2.1 cable.

Conclusion

HDMI 2.1 not delivering 4K 120Hz on Lenovo ThinkBook 16p Gen 4 in Windows 11 is resolved by switching to Discrete GPU mode in Lenovo Vantage, using a certified HDMI 2.1 48Gbps cable, and selecting 4K 120Hz in NVIDIA Control Panel. Discrete GPU mode bypasses the Intel iGPU bandwidth limitation that prevents 4K 120Hz in Hybrid mode. Updating the NVIDIA driver from Lenovo Support ensures HDMI 2.1 DSC support for reliable 4K 120Hz output.