Slow to wake with white screen.

[Factionrider]

2009 4.1>5.1

Dual x5680

48gb ram

USB 3 AIC

SM951 NVMe and ahci both in lycom dt120 carriers.

After installing the 140 bootrom the machine wants to hang on wake, and presents a white screen that sometimes flickers as well.

Just looking for ideas before I revert back to Mojave 10.12.0 and then high Sierra if that doesn’t work. I don’t think it’s hardware.

 

[bsbeamer]

what GPU?
what monitor?
what connection/port and version/protocol?

 

[Factionrider]

what GPU?
what monitor?
what connection/port and version/protocol?

Sorry I thought I had that in the specs.

Strix RX 580, Samsung 27 UHD, DisplayPort 1.3 or 1.4.

I haven’t checked with my old DVI 1080p monitor. I should prob do that when I get home.