MP 7,1 Triple monitor keep turning on/off on Boot Camp Windows 11

[LEOMODE]

I'm just curious, especially to anyone using Boot Camp Windows 10 or 11 using a triple monitor setup. I noticed that some time ago (I am not sure if it's the Nvidia driver or Windows. I know it's not my cable because I used the same cables before without any issues and I even swapped to other compliant cables just today and the behavior was the same), whenever I wake my Mac Pro 7,1 up from sleep, randomly the monitors will keep blinking, turning off and on, making the Windows alarm noise as if they were connected brand new, and eventually they'll stop but the taskbars will also suffer from not loading so once they're loaded or monitors stop blinking then everything goes back to normal. I'm using LG 27" 4K 144hz monitors. Has anyone experienced this? I noticed I don't get this if I use dual monitors. My environment is Nvidia 4090 FE + external PSU 700w. Just to iterate, I didn't have this issue before but started to get this starting last year. Thanks.

 

[seggy]

Your description isn't fully clear but it seems to be indicative of Displayport Deep Sleep issues. Windows 10 doesn't support this, which is why even if you have the same pair (or in my case, 3-4) of modern monitors which have Deep Sleep, they can often wake up in the wrong sequence, stay turned off, etc.

Windows 11 isn't faultless in this respect, but at least it has support to remember which monitors are supposed to be where even if they enter Deep Sleep.

My guess is you changed your monitors last year.

And jeez, a 4090 kludged on a Mac "Pro". You might as well have bought a real professional workstation...

 

[LEOMODE]

Your description isn't fully clear but it seems to be indicative of Displayport Deep Sleep issues. Windows 10 doesn't support this, which is why even if you have the same pair (or in my case, 3-4) of modern monitors which have Deep Sleep, they can often wake up in the wrong sequence, stay turned off, etc.

Windows 11 isn't faultless in this respect, but at least it has support to remember which monitors are supposed to be where even if they enter Deep Sleep.

My guess is you changed your monitors last year.

And jeez, a 4090 kludged on a Mac "Pro". You might as well have bought a real professional workstation...

I bought my monitors a while back so this issue has came up recently. So I am not sure if it has to do with what you described. But the symptoms definitely does sound very similar.

And I also have other laptops so I am using this specifically for Mac/Windows dual boot combo. No issue as I love the duality of it.