This is a recurring issue with several types of Docks, Laptops, Monitors throughout my support areas but here I will focus on one specific Laptop/Dock/Monitor combo that seems to be unsolvable.
The laptop/setup is: an EliteBook 1040 G4 connected to a HP Thuderbolt 3 Dock 120W G2 with Dual EliteDisplay E243i Monitors both connected by Displayport.
The issue is: one or both monitors will intermittently flicker, blink, or lose signal for anywhere from a few seconds to 5 minutes or until a restart.
Troubleshooting:
In this specific case I gave the user a temperary loaner laptop of a different model (EliteBook 840 G5) and the issue STILL happened. I've also tried a different style Dock (HP Elite 90W Thunderbolt 3 Dock with firmware fully updated) and the issue still happened. I also tried a known working pair of EliteDisplay E241i (older model) monitors and the issue still happend.
I've attempted to troubleshoot every component of the setup. Here is a breakdown of what I tried:
Laptop:
Windows 10 64bit Enterprise 1709
Updated to the latest BIOS (01.23 Rev.A - Release Date Aug 17, 2018)
Updated to the latest of every driver using HP Support Assistant including Thunderbolt 3, Chipset, Graphics Drivers, Audio, Network.
I also sent the Laptop in to HP and had the motherboard replaced. I tried reinstalling Windows 10 and all of the above BIOS and Drivers
Issue remains.
Dock(s):
1)Updated HP Elite 90W Thunderbolt 3 Dock Firmware
2)For the HP Thuderbolt 3 Dock 120W G2 - I Couldnt find a firmware update. Only found a Audio Driver and a Ethernet Controller Driver which were both installed.
Issue remains.
Monitors:
Installed HP E243i LCD Monitor Driver (1.00 Rev.A)
I tried setting the monitor settings DP Hot-Plug Detection - Always Active.
I tried setting the Default Input to DisplayPort
I tried Turning "Auto Sleep Mode" off
I tried Turning "Auto Switch Input" off
I tried brand new Displayport cables
Issue Remains.
Power:
I tried Plugging the Monitors and Dock into a new surge protector/power strip and also directly in the wall
Issue Remains.
After troubleshooting this issue with this specific laptop/setup I've exausted every option and am now asking if anyone else has been able to solve this issue.
Like I said at the beginning this is happening with several models of HP laptops and Docks in my support area including Elitebook 840 G3, Elitebook 840 G5, EliteBook 1040 G3, EliteBook 1040 G4, HP UltraSlim Docking Station, HP Thuderbolt 3 Dock 120W G2, HP Elite 90W Thunderbolt 3 Dock. The above is one of many instances that is really important to resolve as quickly as possible. Any solution or advice would be greatly appreciated!
Thank you!