External monitors often going off and on

[Jax38]

DunBuggy. you will have to go back to older posts. There is a workaround and it has worked for me. In my post a month back, I changed to expensive cables and got rid of dongles connecting HDMI to DP direct into the hub. 

If you're in Canada - go to Canada Computers get DP to HDMI Cable 8K 60HZ cable. The shortest length at the time was 6FT - $36.15 including taxes. I bought TWO after experimenting with one monitor HDMI to HDMI (failed). Now I use two of these cables and it has fixed my problem. Do not update firmware.

I highly recommend that you also contact HP support to log a ticket and to inform them of this forum. the more us that report it the better. I hope this workaround helps you as it did for me (it took this community to help with the workaround and over a year of frustrated to have this resolved with a hack).

[Petit_Mouton]

Hello, same problem on my side, I have the very strong impression that the screen starts to go dark when you launch a lot of applications, this must somehow become too demanding for the dock

[ecrooker]

After installing the updated firmware 1.5.22.0 for Dock G4 through their HPIA (image assistant) and a couple Nvidia driver updates about a week or two ago - I have not seen any monitor blank out since. Never changed cables.

[Carel_Costo]

Updated to 1.5.22.0 for Dock G4 yesterday. 

today one monitor flickered again (as it has done since the start). 

[Giacomo-UCDS]

Similar situation here.
I have an HP EliteBook 1040 x360 G10 (13th-gen Core i7, Intel GPU) with a HP Thunderbolt Dock G4 120W and two HP 24es monitors, using the basic HP HDMI cable provided in the monitor box and a basic/cheap DisplayPort-to-HDMI that always worked fine on everything but the Dock G4.
I experienced casual external monitors black screens since the day I bought the dock, but since updating to 1.5.22.0 last week I never had a single one, never changed cables.

[Jax38]

That's great news. Thank you for the update. I've asked a friend who happens to work for HP, also experiencing the same thing, to do the update and report back. Given that I'm stable without any incidents I'm leaving my configuration as is for now. Thank you for letting the community know!

[Jax38]

Thank you for the update. Giacomo-UCDS referenced that the 1.5.22.0  worked. It's disappointing that it's a universal fix.

Back the cable updates again?!

[DunebuggyJay]

1.5.22.0 Did not fix my issue. my screens still flash on and off at least 10 times a day. (I did the update last week)

[Grrrrrene]

Me and many of my colleagues have this issue. I read about changing the cables, but we already use DP-DP cables (which if I understand correctly shoudl fix the problem). And the strange thing is: I had this issue when I started working at my current desk, it disappeared after a while and came back a few days ago. I have not installed any firmware updates to the dock, nor have I changed anything with my monitors or cables. 

The strange thing is that it used to only happen to my right monitor (secondary monitor), but now my left (primary) monitor starts acting up too. I have an older model dock at home, which works just fine. It is just this specific model that makes my displays turn black for a few seconds, every 10-30 minutes. 

[Giacomo-UCDS]

It is not about the type of the cable (DP-to-DP or DP-to-HDMI), but about the quality of the cable.
Apparently, high-performance, shielded cable like the ones manufactured by Maxonar can resolve the issue.

From what I understand the dock video outputs generates a low-power signal that may be affected by interferences from the environment; using high-performance, shielded cables helps to avoid the interferences.

As for me, after I upgraded to lastes firmware few weeks ago I have not experienced a single black screen yet, without replacing my basic and cheap cables.