Faint vertical lines/static on external display connected to M1 MacBook Pro

I'm having the exact same issue with my M1 Mac mini. Tried several different displays and all showed these artifacts to some extent, some more, some less. Except my Samsung TV - everything looks fine there. But TVs have all kinds of image processing/enhancement built in, so maybe it's just smoothing out the artifacts on its own.

I have the same issue on an HP pavilion 25 and 27, connected through HDMI. This issue only occurs with my M1 MacBook Air. all of my older intel Macs have not issue, so it is not a problem with the cables / adapters / monitors.

Mine has the exact same issue. I have a mac mini m1 16GB that's connected to two LCD's (Acer SA270). The displays work very well on every other device I throw at them. It's just the mac that's the problematic one. I tried many cables/hubs to no avail, however when I connected to a TV it was all fine (tested all the cables and hubs on it).

Hopefully Apple will resolve this soon, the flickering banding artifacts is making me go crazy. Updating does not help. :(

I'm having the same issues as well with my new MBP M1 with 16GB ram running MacOS 11.4. My monitor is a 32" Samsung Odyssey G7.

The issue is easily replicable when clicking "share" or "save" on a youtube video. The screen will flicker every time. Appears to happen when the content on screen is dark. Seems to happen less when using the light system theme. Also messing around with black levels, contrast and brightness of the external display will bring up the scanlines. Bummer these two very expensive pieces of tech don't play nice.

I am experiencing this issue as well, but I think it's attributable to a malfunction of the display itself — an Apple 30" Cinema Display — and not any sort of glitch associated with the model of Mac I am using. (In fact, I am not even on an M1 Mac, nor do I have the latest version of macOS.)

The issue seems to be intermittent, typically being most prevalent when the display has yet to 'warm up.' Following that point, any and all artifacts on the display tend to gradually decrease in intensity, until they're entirely gone (or, at times, present, yet simply less noticeable than before). These "artifacts" present themselves as vertical lines of striking similarity to those that OP has displayed. And, at one point, when the display was suffering from a particularly bad episode, said pinstripes were overlaid by a gray/light-gray pattern. (Both such instances are pictured below. The first shows the typical occurrence of vertical lines, over a dark background; the second shows what occurred during a more intense episode.)

Perhaps it's a T-con board failure, or LCD panel failure? I really hope someone knows, because it is a darn shame that such an otherwise beautiful display is acting up in this way. I understand that this may be separate from what others are experiencing, but I still thought I might as well contribute some info from my end.

I also forgot to mention, I have tested both monitors directly connected to the MacBook as well as running through my CalDigit TS3 Plus dock and the issue eventually happens either way. I have made sure my dock is running the latest firmware.

"The issue is easily replicable when clicking "share" or "save" on a youtube video. The screen will flicker every time."

For my setup I can't confirm that. I have not yet found a way to reproduce the flickering issue, for me it seems to happen randomly.

<< once the problem occurs for me, the lines will often stay on the monitor even after I unplug my displayport or HDMI cable or after power cycling. >>

Then it is a display problem, NOT a computer or interface problem.

Hi! I know it's been a while since you commented here but wondering if your problem still happens?

I just got my Macbook Pro and Samsung Monitor. Noticed some horizintal lines appearing sometimes on darker background. I was thinking to change my adapter instead but seems like it's more of an software issues since you experience it too? :c I'd be happy if you can let me know ur update!

<< Noticed some horizintal lines >>

Horizontal Ines are caused by completely different issues.

Please start a new discussion and include your complete information including what MacBook Pro by model-year, what display and EXACTLY what cables, adapters, and docks are being used to connect it.

Nope, I spoke too soon. The problem still persists even on static images.

Yeah, Apple pretends there is no such issue. I hope the problem originates from the software. Otherwise, if it is a hardware issue, they should offer a proper solution.

Why is it only caused by the Macbook M1 then? And it happens on both of my monitors of different models? And why is it relatively widely reported for the M1's specifically?