External Monitors not being recognized

[LRybinski]

I am having issues getting my external monitors (DVI to DisplayPort Cables) to display with my HP ZBook Power 16 in G11 Mobile Workstation (Windows 11 24H2) and my HP Thunderbolt 4 Ultra 180W/280W G6 Dock.  Updated dock firmware, BIOS, and Intel Graphics Driver.  It only displays my monitor that has DVI to HDMI--but the weird thing is when it was updating the firmware for the dock, it displayed the progress of the update on all 3 monitors.  Any suggestions?

[BongChaGomez]

Hello @LRybinski ,

Welcome to HP Support Community.

I’m really sorry this is happening. The fact that all 3 monitors worked during the dock firmware update is actually the biggest clue — it tells us the hardware is fine, and this is a signal-mode / firmware / driver negotiation problem, not a bad dock or bad GPU.

Why your DVI→HDMI monitor still works

HDMI output on the dock:

• Uses a separate signal path

• Has better legacy support

• Intel still allows HDMI→DVI conversion

DisplayPort → DVI is the problem path.

Fixes (in order of success rate)

✅ FIX #1 (MOST IMPORTANT): Use ACTIVE DP→DVI adapters

You must use Active DisplayPort to DVI adapters (not cables).

What to look for:

• “Active DisplayPort to DVI”

• Supports 1920×1200

• Has a conversion chip

❌ Passive cables will NOT work reliably on TB4 docks
✅ Active adapters almost always fix this instantly

This is the #1 fix HP recommends internally for TB4 docks + DVI monitors.

✅ FIX #2: Force DP 1.2 mode in dock (hidden but effective)

1. Disconnect dock

2. Power off ZBook

3. Connect dock → power on

4. Enter BIOS (F10)

Check:

• Advanced → Thunderbolt / USB-C

• Disable:

  • “High Resolution DP” (if present)

• Enable:

  • DP 1.2 compatibility

Save → boot

This forces a more legacy-friendly DP handshake.

✅ FIX #3: Disable Display Stream Compression (DSC)

DSC breaks DP→DVI adapters.

1. Intel Graphics Command Center

2. System → Display

3. Disable:

   • Display Stream Compression

   • Adaptive Sync (temporarily)

Reboot

✅ FIX #4: Disable MST temporarily (diagnostic)

1. Intel Graphics Command Center

2. Disable MST

3. Connect only one DP→DVI monitor

If it works → MST + DVI conflict confirmed.

✅ FIX #5: Power drain reset (important after firmware update)

1. Disconnect dock

2. Unplug dock power

3. Hold dock power button 30 seconds

4. Shut down laptop

5. Hold laptop power 15 seconds

6. Reconnect everything

This resets DP routing tables.

Hope this works for you.