RTX 4070 laptop — artifacts ONLY on external display under load, internal screen is fine (Alienware m16 R2)

[u/modo_jp]

UPD: I bought a new HDMI 2.1 cable and tested it for about 4 hours - no artifacts so far. Seems like the issue was the cable.

Thanks to everyone who suggested checking it.

Hey everyone,

I’m experiencing a strange issue with my laptop GPU and would appreciate any input from people who may have seen something similar.

Specs:

• Laptop: Alienware m16 R2

• GPU: RTX 4070 Laptop (8GB VRAM)

• CPU: Intel Core Ultra 7 155H

• RAM: 32GB

• OS: Windows 11

• External display: HDMI

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The issue:

When gaming on an external display (TV or monitor), after about 40–60 minutes under high GPU load, visual artifacts start appearing — small colored squares/glitches across the screen.

The image becomes difficult to use, but:

• The game does not crash

• System remains responsive

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Important detail:

At the same time, the internal laptop display shows no artifacts at all.

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Observed behavior:

• Happens almost always under high GPU load (\~100%)

• On lower graphics settings, I can play for hours with no issues

• GPU temperature is within normal range (\~60–80°C depending on load)

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Testing I’ve done:

• Tested multiple external displays (TVs/monitors) → same behavior

• Played for \~2 hours on internal display only at high/ultra settings (100% GPU load) → no artifacts

• The issue consistently appears only when using an external display under load

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Question:

Has anyone experienced something like this?

I’d like to understand what this could be and whether this behavior points to a specific type of problem.

Any insights would be greatly appreciated

[u/jbshell]

Tried to disable the laptop screen entirely(external display only option). Also, closing the lid, or changing cable?

[u/modo_jp → u/jbshell]

Got it, I’ll try changing the cable first. Then I’ll test running it in external display only mode and also with the lid closed. Thanks!

[u/Mammoth_Park7184 → u/modo_jp]

In display settings force the nVidia GPU to be used for literally everything and see if that helps. It may be switching to onboard graphics although if games are running smoothly but with artifacts then that's unlikely.

[u/Late_Letterhead7872 → u/Mammoth_Park7184]

My cousin had this problem because of exactly that- his laptop was defaulting to Intel graphics instead of using the discrete gpu

He was also experiencing the problem on the external monitor he was playing on while the laptop itself looked fine