Lenovo ThinkPad P1 Gen 6 HDMI 2.1 Not Working Fix Windows 11

The HDMI 2.1 port on your Lenovo ThinkPad P1 Gen 6 Intel Core Ultra 9 is not outputting at the expected resolution or refresh rate – a 4K 144Hz monitor only shows 4K 60Hz options, or HDMI output is limited to 1080p. NVIDIA driver configuration and cable quality determine whether HDMI 2.1 bandwidth modes are available on the ThinkPad P1 Gen 6.

This guide covers NVIDIA driver HDMI 2.1 configuration, cable requirements, and display settings for maximum HDMI output on the Lenovo ThinkPad P1 Gen 6 in Windows 11.

“ThinkPad P1 Gen 6 HDMI only showed 4K 60Hz for my 4K 144Hz monitor. HDMI cable was old 2.0 specification. New HDMI 2.1 cable and updating NVIDIA driver unlocked 4K 144Hz display perfectly.” – Suhaimi, CAD engineer from Shah Alam

Why HDMI 2.1 Does Not Work on ThinkPad P1 Gen 6

HDMI 2.1 at 4K 144Hz requires 48Gbps bandwidth, which is only available with a certified Ultra High Speed HDMI (UHSHDMI) cable. Standard HDMI 2.0 cables are limited to 18Gbps, supporting only 4K 60Hz. When a lower-specification HDMI cable is connected, the NVIDIA RTX GPU and the monitor negotiate to the highest mode both cable and display support – often 4K 60Hz or lower. The monitor and GPU both support 4K 144Hz but the cable is the limiting factor.

• HDMI cable is HDMI 2.0 or lower spec – limits bandwidth to 18Gbps (4K 60Hz maximum)
• NVIDIA RTX driver not updated to recognize 4K 144Hz mode for this monitor
• NVIDIA Control Panel display refresh not set to 144Hz manually after connecting monitor
• Monitor HDMI input not set to HDMI 2.1 mode in monitor OSD settings

Fix 1 – Use HDMI 2.1 Ultra High Speed Cable

Replace any existing HDMI cable with a certified HDMI 2.1 Ultra High Speed cable (labeled 48Gbps). This is the most common reason 4K 144Hz is unavailable despite both GPU and monitor supporting it. Ultra High Speed HDMI cables are available in 1-2 meter lengths and are the mandatory hardware requirement for 4K 120Hz+ and 8K modes. After cable replacement, reconnect the monitor and check available refresh rates in Windows Display Settings.

Fix 2 – Update NVIDIA RTX Driver from Lenovo Support

Go to support.lenovo.com, search for ThinkPad P1 Gen 6, and download NVIDIA GPU driver for Windows 11. Install and restart. Updated NVIDIA drivers include expanded EDID reading capability that correctly parses 4K 144Hz HDMI 2.1 mode advertisements from the connected monitor, adding these modes to the available refresh rate list in Windows Display Settings and NVIDIA Control Panel.

Set Refresh Rate in NVIDIA Control Panel

Open NVIDIA Control Panel – Display – Change resolution. Select the external monitor (not the ThinkPad P1 built-in display). In the resolution list, select 3840×2160. In the refresh rate dropdown, select 144Hz (or the maximum supported rate). Click Apply. If 144Hz is not listed, the cable or monitor HDMI input may be the limitation – verify the monitor has HDMI 2.1 input and the cable is rated for 48Gbps.

Fix 3 – Enable HDMI 2.1 in Monitor OSD

Access the monitor on-screen display (OSD) using physical buttons on the monitor. Navigate to HDMI input settings and look for HDMI Mode or HDMI Version. Select HDMI 2.1 or HDMI 2.0 depending on available options. Some monitors default to HDMI 1.4 for compatibility and require manual selection of HDMI 2.1 before the higher bandwidth modes become available from the connected source. After changing OSD settings, the monitor may turn off and re-sync before showing the new resolution options.

Fix 4 – Try Thunderbolt 4 to HDMI 2.1 Adapter

If HDMI 2.1 output remains problematic, use one of the ThinkPad P1 Gen 6 Thunderbolt 4 ports with a Thunderbolt 4 to HDMI 2.1 active adapter (club3d or similar). Thunderbolt 4 provides 40Gbps (sufficient for 4K 144Hz at 8-bit color) and active adapters include protocol conversion chips that ensure full HDMI 2.1 feature negotiation. This path bypasses any HDMI controller firmware issues on the ThinkPad P1 Gen 6 motherboard HDMI 2.1 implementation.

Frequently Asked Questions

Why is HDMI 2.1 not working on Lenovo ThinkPad P1 Gen 6?

HDMI cable is lower spec (2.0 or older) limiting bandwidth to 18Gbps. Replace with 48Gbps Ultra High Speed HDMI 2.1 cable. Update NVIDIA driver and set 144Hz in NVIDIA Control Panel.

Does Lenovo ThinkPad P1 Gen 6 have HDMI 2.1?

Yes – HDMI 2.1 port supports 4K 144Hz and 8K 30Hz with compatible cable and display.

How do I set 4K 144Hz via HDMI on ThinkPad P1 Gen 6?

HDMI 2.1 cable required. NVIDIA Control Panel – Change resolution – select monitor – 3840×2160 at 144Hz. Enable HDMI 2.1 in monitor OSD settings.

What external displays can connect to Lenovo ThinkPad P1 Gen 6?

HDMI 2.1, two Thunderbolt 4, and USB-C. Up to 4 simultaneous external displays via dock and direct connections.

Conclusion

Lenovo ThinkPad P1 Gen 6 HDMI 2.1 not working in Windows 11 is most commonly resolved by replacing the HDMI cable with a certified Ultra High Speed 48Gbps HDMI 2.1 cable. Updating the NVIDIA RTX driver from Lenovo Support and manually selecting 4K 144Hz in NVIDIA Control Panel completes the configuration. Monitor OSD HDMI mode setting and Thunderbolt 4 adapter as an alternative path provide additional options when HDMI port negotiation requires additional configuration.