Docks & Monitors

4K120 or VRR not working on console

Fix 4K120 / VRR / ALLM on a PS5 or Xbox through a TV or AVR — the optional-HDMI-2.1-features reality, the AVR-passthrough trap, the per-input enhanced + game mode toggles, and the Ultra High Speed cable.

Problem summary

4K120, VRR, and ALLM are optional HDMI 2.1 features, present only if every link — console, cable, AVR (if any), and the TV input — implements them and they're toggled on at both ends. The console needs its 4K120/VRR options enabled (PS5 Screen and Video; Xbox Video modes); the TV needs the per-input enhanced-bandwidth setting plus Game Mode/ALLM; the cable must be certified Ultra High Speed (48 Gbps); and an AVR in the middle must have a true HDMI 2.1 input/output or you connect the console directly to the TV and route audio back over eARC. A signal that black-screens the instant a 120Hz/VRR game loads is a bandwidth or AVR-passthrough fault, not a console setting.

Operator snapshotEvidence first

First proof

Enable the console's 4K120/VRR options.

Screen to open

PS5: Settings → Screen and Video (4K120/VRR); Xbox: Settings → General → TV & display options → Video modes.

Expected signal

PS5 Screen and Video / Xbox Video modes have 4K120 + VRR on.

Stop boundary

Stop assuming hardware failure before checking firmware and cable.

Layer path

14K120, VRR, and ALLM are optional HDMI 2.1 features — present only if every link (console, cable, AVR if any, and the TV input) implements them and they're toggled on at both ends.

2The console side needs its 4K120/VRR options enabled (PS5 Screen and Video; Xbox Video modes), and the TV side needs the per-input enhanced-bandwidth setting plus Game Mode/ALLM.

3The cable must be certified Ultra High Speed (48 Gbps); a High-Speed cable silently caps 4K120.

4An AVR in the middle must have a true HDMI 2.1 input/output to pass 4K120/VRR — many early '8K/4K120' receivers had passthrough bugs — otherwise connect the console directly to the TV and route audio back over eARC.

Runbook

Step-by-step runbook

Start here. Do each check in order, compare it to the expected result, and stop when the evidence explains the failure or the safe stop point applies.

Enable console options

Check: Turn on 4K120/VRR in the console video settings.

Expected result: The console outputs the mode.

If not: Greyed-out options point upstream (cable/TV).

Enable TV input features

Check: Turn on the input's enhanced setting and Game Mode/ALLM.

Expected result: The TV accepts 4K120/VRR/low-latency.

If not: Set them on the exact input.

Use a UHS cable

Check: Swap in a certified Ultra High Speed (48 Gbps) cable.

Expected result: The link carries 4K120.

If not: A High-Speed cable silently caps it.

Handle the AVR

Check: Use the AVR's true 2.1 port + Enhanced setting, or go console→TV direct + eARC.

Expected result: 4K120/VRR passes (or you've bypassed the AVR).

If not: Update AVR firmware if passthrough is buggy.

Update + verify

Check: Update TV (and AVR) firmware; confirm VRR support/range.

Expected result: The mode is accepted and stable.

If not: Some TVs need a firmware update for 4K120.

Safe stop: Stop assuming hardware failure before checking firmware and cable.

Decision tree

If: No 4K120/VRR option appears at all

Then: Console toggle or per-input TV setting off.

Action: Enable the console video options and the input's enhanced/Game Mode.

If: Black screen the instant a 120Hz/VRR game loads

Then: Bandwidth or AVR-passthrough fault, not a setting.

Action: Use a certified UHS cable; bypass/upgrade the AVR.

If: Works direct to TV but not via the AVR

Then: AVR lacks a true 2.1 port or has buggy passthrough.

Action: Use the AVR's 2.1 port + Enhanced setting, or go direct + eARC.

If: 4K120 rejected until updated

Then: TV firmware doesn't yet accept the mode.

Action: Update TV firmware, then retry.

Safe stop: Stop assuming hardware fault before a firmware check.

If: VRR tearing/flicker rather than no signal

Then: VRR range/compatibility quirk.

Action: Confirm the display's VRR support and the game's VRR; toggle VRR.

Evidence

Evidence table

Symptom	Evidence to collect	Likely layer	Next action
No 4K120/VRR option to enable	Console video settings + per-input TV setting	Toggles off / Standard input mode	Enable console options + input enhanced/Game Mode.
Black screen when a 120Hz/VRR game starts	Cable rating + AVR passthrough	Bandwidth / AVR-passthrough fault	Certified UHS cable; bypass/upgrade AVR.
Fine direct, fails through AVR	AVR HDMI port tier + firmware	AVR can't pass 2.1	Use 2.1 port + Enhanced setting, or go direct.
4K120 rejected on a 2.1 TV	TV firmware version	Firmware doesn't accept the mode	Update TV firmware.
Tearing/flicker with VRR on	Display VRR range + game VRR support	VRR compatibility quirk	Confirm support; toggle VRR.

Reference

Commands and settings paths

Enable console 4K120/VRR

PS5: Settings → Screen and Video (4K120/VRR); Xbox: Settings → General → TV & display options → Video modes.

Where: On the console

Expected: 4K120 and VRR options are enabled.

Failure means: Greyed-out options mean a link/cable/TV limit upstream.

Safe next step: If greyed out, fix the cable/TV input first.

Enable TV input enhanced + Game Mode

Enable the input's enhanced-bandwidth setting and Game Mode/ALLM for the console's input.

Where: On the TV menu, for that input

Expected: The input accepts 4K120/VRR and low-latency.

Failure means: Standard mode / no Game Mode blocks the features.

Safe next step: Set both on the exact input the console uses.

Test console-direct with a UHS cable

Connect the console directly to the TV with a certified Ultra High Speed cable.

Where: At the HDMI connection

Expected: 4K120/VRR works direct = the AVR/cable was the limit.

Failure means: If direct works, the AVR or cable was the fault.

Safe next step: Use the AVR's 2.1 port + eARC, or keep it direct.

Hardware boundary

Hardware and platform boundary

Change only when

Add a certified Ultra High Speed cable and, if you route through a receiver, an AVR with a genuine HDMI 2.1 (40/48 Gbps) port before expecting 4K120/VRR — or connect the console directly to the TV and use eARC for audio.

Evidence that matters

Console 4K120/VRR toggles on, the TV input's enhanced + Game Mode on, a certified UHS cable, and a true 2.1 path end to end.

Evidence that does not matter

The '8K/4K120' label on an AVR — verify a real 2.1 40/48 Gbps port and current firmware, since early models had passthrough bugs.

Avoid

Using a High-Speed cable for 4K120, or routing through a non-2.1 AVR port and blaming the console.

Related tool/checklist

Use the linked tool when you need a guided plan from your exact symptoms instead of a static checklist.

USB-C dock & monitor setup planner

Last reviewed

2026-06-03 · Reviewed by HomeTechOps. Built from 2026-06 research verified against PlayStation's VRR/PS5 posts and HDMI.org (2.1 features are optional). The operator differentiators are the optional-features reality, the AVR-passthrough trap (connect direct + eARC), the per-input Game Mode/enhanced setting, and the certified UHS cable requirement.

Sources/assumptions

Assumes a PS5 or Xbox Series X|S driving 4K120 and/or VRR/ALLM to an HDMI 2.1-capable TV, optionally through an AVR.
PS5 VRR/ALLM/4K120 behavior and the Ultra High Speed cable recommendation are from PlayStation's own posts; HDMI 2.1 features being optional is stated from HDMI.org.

Source-backed checks

HomeTechOps turns official docs and conservative safety rules into a shorter runbook. These links are the source trail for the page direction.

PlayStation Blog: VRR support for PS5Used for PS5 HDMI 2.1 / 4K120 / VRR behavior, that VRR auto-enables on a compatible display, and the Ultra High Speed HDMI cable recommendation.HDMI: HDMI 2.1 / 2.2 specification overviewUsed for the bandwidth tiers (2.0 = 18 Gbps, 2.1 = 48 Gbps, 2.2 = 96 Gbps), resolution/chroma support, and that 2.1/2.2 features (VRR/ALLM/4K120/eARC) are OPTIONAL per device.HDMI: Cables and the Ultra HDMI Cable Certification ProgramUsed for Ultra High Speed (up to 48 Gbps / 8K60 / 4K120) vs the newer Ultra96 (up to 96 Gbps) cable and the certified-cable requirement for full bandwidth and eARC.

Diagnostic rule

1. Check the simplest signal first.
2. Change one thing at a time.
3. Avoid unsafe electrical or data-loss steps.
4. Stop when the evidence says the risk moved.

FAQ

Why won't 4K120 or VRR turn on even though everything says 'HDMI 2.1'?

Because 4K120, VRR, ALLM and QFT are optional HDMI 2.1 features — the label doesn't guarantee them. Every link has to support and enable them: the console's video options (PS5 Screen and Video; Xbox Video modes), the TV's per-input enhanced-bandwidth setting plus Game Mode/ALLM, and a certified Ultra High Speed (48 Gbps) cable. A High-Speed cable silently caps 4K120. Some TVs also need a firmware update before they accept a 4K120 signal.

It works direct to the TV but not through my AVR — why?

The AVR must have a genuine HDMI 2.1 (40/48 Gbps) input and output to pass 4K120/VRR, and several early '8K/4K120' receivers shipped with passthrough bugs. Many also gate it behind a '4K/8K Signal Format → Enhanced' menu setting per input. If it still won't pass, connect the console directly to the TV and send audio back via eARC.

The screen goes black the moment a 120Hz/VRR game starts — what is that?

That signature — fine until a high-refresh/VRR mode loads, then a black screen or signal drop — is a bandwidth or AVR-passthrough fault, not a console setting. Suspect a non-Ultra-High-Speed cable, an AVR that can't pass HDMI 2.1, or a TV input/firmware that doesn't accept the mode. Test console-direct with a certified cable to isolate it.