Phantom output for displayport monitors

General system Kernel, boot, graphics & hardware
41

After a final couple hours of troubleshooting I think I’ve settled on this issue being caused by faulty monitors. Here’s why:

Key: Group #) [phantom output/total system shutdowns] - who’s monitor, who’s cable, who’s PC

  1. [0/20] - GF’s monitor, her cable, My PC

  2. [1/2] - 1 of my monitors, my cable, her PC

  3. [2/2] - both of my monitors, my cables, her PC

  4. [1/2] My monitor, her cable, her PC

  5. [0/10] Her Monitor, my cable, her PC

  6. [0/10] 1 of my monitors and her monitor, 1 cable was mine 1 was hers, her PC RUNNING WINDOWS

The fact that I experienced no phantom output while dual booting into Windows on her PC is absolutely baffling to me. Based on seemingly no one else ever having experienced this issue before, or at least hasn’t posted about it, I think it’s safe to rule this as a faulty monitor and not an issue with the Linux kernel that doesn’t happen on windows.

Furthermore to the faulty monitor claim, when a normal monitor loses it’s input signal it will go into sleep mode and you can still press the monitor’s physical buttons to bring up an input selection menu. Instead, my monitors do not respond to the physical buttons including the power button. If this was an issue with PC hardware, unplugging the displayport cord would stop any constant signal being sent to the monitor. Instead, I believe it receives the signal to go to sleep, and then some type of short happens. It is VERY VERY strange that this same type of issue happened near the same time on both monitors.

Anyway, thanks to @ricklinux and @MikeDelta42 for spending the time to help me. I’ll be marking this as resolved soon!

42

So what does this mean then one monitor is the problem?

43

It’s both of my displayport monitors that experience this. Very suspicious that both of them are experiencing the exact same issue but, Occam’s razor; The monitors are behaving weirdly so I thought to troubleshoot them on a different PC. I observed the same issue on 2 completely different PCs with various cables and even power cords, so that leads me to believe they’re both faulty in the same way

44

What kind of monitors are they? Brand and model?

45

Both are ASUS VG278 purchased in early 2019. My theory is the crappy Amazon cables may have damaged them. They’ve been through 3 moves to a different house since then but I always pack it carefully in the box it came in whenever transporting them.

46

So does this mean you are going to have to buy new monitors or put up with it?

47

I’ll have to decide whether I want new monitors first or to replace my PC excluding GPU first and deal with the monitors for a while, or buy a new set of monitors first. I have some time to do it, but right now I’m not 100% sure. The monitor issue is very annoying but it isn’t the biggest deal, just an annoying inconvenience I wanted to figure out

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