Video blackout issue T7920

Update: I have been through every exposed Event Log and there are no events that coincide with the timing of the blackouts.

I restarted the system at 11:26. There were multiple blackouts until approximately 12:07. For the past 40 minutes there have been no blackouts.

I'm really at a loss. No ideas yet on what to look at next.

Hello,

imho, you should test with another gpu, in case the current one is developing issues

@mazzinia_ 

I just received 2 gtx1080 ti blowers. I'm expecting an EVGA PRO SLI Bridge HB to be delivered today.

@mazzinia_ 

First, SLI was a waste. The T7920 supports SLI but not on every SLI compatible GPU. SLI isn't available for the GTX1080 TI Blower in the T7920. But I can still use both to help speed up my video renders.

Second, I've still got a problem with the screen blacking out. It does seem to be session based. It does not happen every time I boot the computer.

mmmm in this case try to downgrade the gpu drivers to the previous release ?

@mazzinia_ 
Two different sets of GPUs with 2 different drivers. It happened with a pair of GTX970s and now a pair of GTX 1080 TI Blowers.

@kenact71875e​  Are you able to try any other monitors?  What hookup is being used; any adapters?  If HDMI is being used, try DP.

@bradthetechnut​ I'm using DP and I don't have another DP monitor. I know it isn't impossible for it to be the monitor, but it is less than 3 months old.

As I said, the weirdest part is, if the blackouts start, restarting Windows will usually clear it up. For instance, it's been running nearly 12 hours without a blackout. When it is blacking out, it's every few minutes.

Well, at this point I can only think at 2 options :

1) some issues with windows

2) the psu has some issues with the rail giving power to the gpu

It looked like you were having issues trying a different GPU.  Were you able to try a different GPU as mazzinia suggested?

@bradthetechnut​ that he did, he tried using gtx 1080. At this point the only things left are the OS installation having some quirk, or the psu having an issue on the rail used to power the gpu, I think

Even though the monitor is newer, I think a different monitor should be tried.  Also, try a different hookup, such as HDMI.  Then look at Windows and/or PSU.

A couple of years ago, I bought a refurb Dell P2219h monitor.  It had blackouts, so I thought it was the monitor.  I then got a P2319h monitor.  Same thing.  Switched hookup from HDMI to DP.  No problems since.

I'm still having intermittent issues with my setup. Yesterday I was getting frequent blackouts. I booted into the BIOS and stayed there for about 45 minutes, without a single blackout. I realize the BIOS display puts less of a burden on the monitor.

After booting back into the OS (Win11) the blackouts stopped, but as I was watching several YouTube videos, in Windowed mode, I noticed some page tearing in the videos. I was busy with something and didn't have time to do more testing. This morning, I tried playing a 4k video in both full screen and Windowed mode, with no tearing.

It gets even more strange. The monitor as well as the 7920 are plugged into an Isobar Touchmaster Plus. The Isobar has a ground fault indicator, as well as a low voltage indicator. Earlier in the summer, we had a brownout day, which the Isobar indicated. The only device plugged into the Isobar that isn't directly connected to the 7920 is the docking port for my M6700, which is generally off. Thee other devices plugged into the Isobar are an external raid array, which is normally off, and hasn't been on during any of the blackouts, and a sound system with subwoofer. I do have a lot of electrical devices on the same circuit, but all external to the Isobar.

Sometimes, when I switch on my fluorescent desk lamp, I'll get an approximate 1 second blackout. When my wife turns on the power strip for her computer, I will occasionally get an approximate 1 second blackout. At no time does the power light on the monitor go out.

There does not appear to be any consistency on when the blackouts occur. They can start happening before I've even logged in and I can go an entire day without a single blackout. 

The way you are writing, you seem to have an issue with the power distribution of the house. Question : what's the KW of the power meter / energy contract? How many appliances do you have already running, "when I switch on my fluorescent desk lamp, I'll get an approximate 1 second blackout" ?

After shutting down and booting, and restarting numerous times last night, I tried something different.

I normally turn on the Isobar, which powers both the monitor & 7920, and immediately turn on the 7920, while the monitor is still initializing. I turned on the Isobar and waited for the monitor to complete its initialization and go into power save mode before powering up the 7920. No flickering the rest of the night.

I did the same this morning and so far no flickering. Turning on the fluorescent hasn't affected the monitor. I'll try this a few more days before I consider this solved.