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I'm having the problem where I cannot get 2 monitors running at 4k on HP Thunderbolt G2 Dock / Docking Station.  I have tested multiple setups that prove that I can run either one of the screens at 4k @60Hz from the G2 Dock, or both at 4k @ 60Hz if monitors are connected directly to laptop (HDMI + USB-C-to-DP), but no 4k @ 60 on 2 screens simultaneously when both are connected to the Dock. Second screen either runs at 1080p max or has NO SIGNAL.

Individually

Monitor 1 runs 4k @ 60Hz on DP to DP cable connected to either DP Port 1 or Port 2 Thunderbolt G2 Dock.

Monitor 1 runs 4k @ 60Hz on, USB-C to DP adaptor (DP-DP Cable) connected to either left (marked SS & DP) or right (marked Thunder) USB-C ports on Thunderbolt G2 Dock.

Individually

Monitor 2 runs 4k @ 60Hz on DP to DP cable connected to either DP Port 1 or Port 2 Thunderbolt G2 Dock.

Monitor 2 runs 4k @ 60Hz on, USB-C to DP adaptor (DP-DP Cable) connected to either left (marked SS & DP symbol) or right (marked Thunder symbol) USB-C ports on Thunderbolt G2 Dock.

So the above proves that cables, adaptors and monitors are capable of running 4k

Connecting 2 monitors 

Scenario 1 - Monitor 1 in Left USB Port (marked SS & DP symbol) via USB-C to DP adaptor + Monitor 2 to DP Port 1 or Port 2 - one monitor runs at 4k, second only runs 1080p. Which ever monitor is connected to the dock first will run at 4k.

Scenario 2 - Monitor 1 in Right USB Port (marked Thunder Symbol) via USB-C to DP adaptor + Monitor 2 to DP Port 1 or Port 2 - one monitor runs at 4k, second monitor - no signal. Which ever monitor is connected to the dock first will run at 4k, second monitor will display - NO SIGNAL.

Scenario 3 - Both monitors run happily at 4k @ 60Hz when connected directly to laptop - via HDMI port and Thunderbolt port (via same USB-C-DP Adaptor that doesn't work in the Dock)

Dock is Thunderbolt G2, just installed latest firmware - HP Thunderbolt Dock G2 - Firmware 1.0.69.1.

I have read similar thread, but the solution didn't work.

Solved: 2 x 4K Monitor @ 60 Hz with Thunderbolt Dock G2 Output - Page 2 - HP Support Community - 702...

2021-02-15 - Just an update.

1. Monitor 1 & 2 run 4k @ 60Hz when connected directly to the laptop - in HDMI and Thunderbolt/USB-C port (via USB-C to DP adaptor which doesn't work on the Dock TB port) on the laptop, can be swapped around but still both run 4k.

2. Spent some time with HP support, got all the Windows updates up to date - did not resolve problem.

3. Uninstall Intel UHD driver, rebooted - did not resolve problem.

4. Update BIOS to the latest current version (01.04.01) via HP Assist tool.

5. Changed BIOS Graphics mode from Hybrid to UMA  - did not resolve problem.

6. Changed BIOS Graphics mode from UMA to Hybrid - did not resolve problem.

7. Reset BIOS to Factory Defaults - did not resolve problem.

8. Purchased different USB-C (Thunderbolt compatible) to DP cable - did not resolve problem.

2021-02-16 - update.

1. Updated all drivers to HP official Drivers:

sp112038 - HP Intel Chipset Device Software - Comet Lake - 10.1.18508.8239A

sp112039 - HP Intel Dynamic Tuning - Comet Lake - 8.7.10200.12510A

sp105522 - HP Intel HID Event Filter Driver - 2.2.1.379A

sp112082 - HP Intel Management Engine Driver - 2044.15.0.1953A

sp112041 - HP Intel Serial IO Driver - Comet Lake 30.100.2020.7C

sp105538 - HP Intel TXTACM Driver - 1.8.0.0W

sp106191 - HP Intel Thunderbolt 3 DCH Driver - 72A

sp110955 - HP DisplayLink Graphic Driver - 10.0.189.0A

sp111407 - HP Intel Video Driver and Control Panel - 27.20.100.8853W

sp111850 - HP NVIDIA Video Driver and Control Panel - 27.21.14.5269W

Run HP Thunderbolt Dock G2 - Firmware 1.0.69.1 again,  it picked up some out of date components on the second run, seemed like these were installed.

Unfortunately the problem is still unresolved.

The USB-C to DP adaptors/cables used are as below

15cm USB 3.1 Type-C to DisplayPort Cable Adapter (cablechick.com.au)

1.8m USB Type-C to DisplayPort Cable (Thunderbolt Compatible) (cablechick.com.au)

A little lost at the moment, will proceed with Dock replacement.

2021-02-17 - update.

Replacement dock arrived, checked firmware on the replacement dock and it is 1.0.63.1.

- Connected replacement dock to laptop, test all scenarios and it displays the same behavior/issue as the original dock.

- Updated firmware on the replacement dock to 1.0.69.1, re-test, issue remains.

- Purchased USB-C to HDMI adaptor cable to trial same scenarios but via HDMI port (not DP). Re-test all scenarios, issue is unresolved.

- New USB-C to HDMI cable is working fine and can achieve 4k @ 60Hz when connected directly to the laptop or when only 1 monitor connected to the dock.

It appears the G2 Dock is not capable of running 2 monitors at 4k @ 60Hz resolution. There're issues with either dock itself (2 docks tested) or the compatibility issue between HP G2 Dock & HP ZBook G7. At the moment I'm stuck with connecting second monitor to laptop's HDMI port, which is very disappointing and frustrating as the reason behind buying a dock was to have single cable connected to the laptop and have all peripherals connected to the dock.