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DisplayPort supported Type-C issue (Zephyrus G15 2022), Grey lines/shadows

Level 8

Hello all,

I have a 2022 Zephyrus G15 (GA503RM). It has 2x USB 3.2 Gen 2 Type-C which supports DisplayPort™ / power delivery.

I recently bought a monitor (Samsung Odessy G7, 4K 144Hz). I connected my monitor to my laptop with a reliable Type C to Displayport(1.4) cable. There's a strange issue I am facing.

When I connect the cable to the first Type C slot (the one next to Type A), I get 4K, 144Hz everything's fine but no G-Sync.

When I connect the cable to the other Type C slot (the one next to the 3.5 mm jack), I still get 4K 144 Hz, I get G-Sync, but I also get weird moving horizontal or shapeless light grey lines/shadows on my screen. They are visible, especially on dark grey backgrounds. When I scroll, they move. Also when I watch videos on YouTube (not full screen) there seems to be white or light grey (sometimes colored) blooming at the edges of the video screen. 

With the first slot, I do not have these weird grey lines or blooming at all. 

All the software is up to date and I use W11 Pro 23H2.

Does anybody have the same issue or an idea for the solution?

PS: I tried connecting it with an HDMI cable (the laptop has HDMI 2.0b, the monitor has 2.1 and the cable supports 2.1) but I can only get 4K 60Hz no matter what type of cable is used, and no G-Sync. Therefore, HDMI is not an option for me.


greenish horizontal linesgreenish horizontal lineswhite bloomingwhite bloomingpink bloomingpink bloominggreenish horizontal shadowgreenish horizontal shadow


Level 7

I have been facing this issue from almost a year, i don't know how to solve it either.

Level 12


The cable I'm using is a USB Type-C to DisplayPort cable. Brand: Paugge

USB C male to Displayport 1.4 male
* Thunderbolt 4, Thunderbolt 3 Port Compatible
* HBR3 (DisplayPort High Bit Rate 3) by 32.4 Gbps Bandwith

It sounds good, but it works badly.