Tearing-like display artifacts on Philips BDM4065UC

[madcrow]

Hi There,
Anyone familiar with this kind of display artifact?

Gallery: https://imgur.com/a/tYc2dWK

At a superficial glance, it sort of looks like screen-tearing. But that square-wavy boundary is weird...

The phenomenon was detected on

• 3 screen <=> PC combos consisting of
• 2 different screens (same model: Philips BDM4065UC)
• driven by 2 different PCs via
• 2 different Nvidia GPU models (one desktop, one mobile) multiple generations apart,
• running on 3 different Nvidia drivers, each with siginficant age-gap,
• under Win10 Pro 22H2.

Connections used: DP source to DP sync and USB Type-C (DP alt mode) source to DP sink, respectively.
I've owned one of the screens for almost 10 years, and never seen the artifact until about 2 months ago. The other screen (with the more frequent occurrence rate) is a recent second-hand purchase. I've also owned for both PCs (with unchanged HW build) for several years.
It comes and goes sporadically. One one PC, it shows up once every 4h, on average. On the other one, I've detected it much less frequently, although that might be due to the typically static screen content I tend to work with on that unit.
The artifact is sometimes stationary (for up to about a minute), but more commonly, it moves slowly from top to bottom. The exact vertical location-range varies, and has never spanned the entire screen height.
The anomaly affects the whole (horizontal) screen real estate, and it is not limited to any specific application. Whenever I faced the anomaly, I was always using standard, garden variety 2D desktop applications: Chrome, PDF Xchange Editor, Total Commander, PotPlayer, various IDEs, Windows Settings app, Start menu, etc.
Nvidia control panel VSync settings are not customized on either setup, "HW-accelerated GPU scheduling" is disabled in the Win10 graphics settings.
Any ideas what this could be? MS screwed up the Win10 graphics subsystem in one of the recent updates? HW failure? If so, which component is the likely culprit?

[madcrow]

Update:

• Enabling VSync in Nvidia control panel (-> ON / Fast) makes no difference whatsoever.
• Enabling "HW-accelerated GPU scheduling" in the Win10 graphics settings significantly decreases the frequency of occurence, but does not eliminate it

[CapLeaker]

Has nothing to do with the monitor at all. This is more like a GPU / mouse settings problem.
I had something very similar where I had the same “tearing” problem under scrolling websites on two different desktop computers, both using onboard graphics. One had a dual screen setup, the other a 40” TV.
Try lowering resolution, frequency setting, how many lines to scroll, etc…

I ended up back then getting two EVGA GTX1050's, put one in each computer and called it a day. Works fine as kind today.

[madcrow]

I ended up back then getting two EVGA GTX1050's, put one in each computer and called it a day. Works fine as kind today.

Funny you should say that. One of my affected VGAs is a desktop GTX1050 Ti by ASUS. (The other one is a mobile Quadro T1200.)
Interestingly, the phenomenon has never shown up with my ancient GTX970 running on the same settings.
What's even more weird is that I had not touched my graphics & mouse settings for years. The drivers were also not updated either for quite a while (either by me or Windows Update) - until the artifacts popped up one day, and I started to experiment with driver replacement / reinstallation on purpose.
So it if it is a configuration issue, then MS must have changed something under the hood with one of the security updates which broke the previously working settings. But if that is the case, the issue should be more wide-spread than it is. (Before posting here, I ran a couple of searches in hope of finding similar incident reports, but came up pretty much empty...)
Nevertheless, I'll try to follow your advice and play around with random graphics & mouse settings until something sticks. If you have any specific ideas about what to try, don't hold back

[CapLeaker]

Funny you should say that. One of my affected VGAs is a desktop GTX1050 Ti by ASUS. (The other one is a mobile Quadro T1200.)
Interestingly, the phenomenon has never shown up with my ancient GTX970 running on the same settings.
What's even more weird is that I had not touched my graphics & mouse settings for years. The drivers were also not updated either for quite a while (either by me or Windows Update) - until the artifacts popped up one day, and I started to experiment with driver replacement / reinstallation on purpose.
So it if it is a configuration issue, then MS must have changed something under the hood with one of the security updates which broke the previously working settings. But if that is the case, the issue should be more wide-spread than it is. (Before posting here, I ran a couple of searches in hope of finding similar incident reports, but came up pretty much empty...)
Nevertheless, I'll try to follow your advice and play around with random graphics & mouse settings until something sticks. If you have any specific ideas about what to try, don't hold back

I actually DO! For shits and giggles boot that computer up into Linux Ubuntu or Mint and see if you still have this problem.
Same as you, back then I found not much in the internet about it. One is an ASUS with a 4th gen Intel and the other a 6th gen Intel. Both have that problem on their onboard graphics. Only difference is mine are running Linux now.