Summerbreeze

New HP Elitebook 850 G6.

• Issue: black screen when booting with the HP Thunderbolt dock G2

• Raising the laptop lid doesn't fix the issue, both screens are black.
• Seems to occur (more frequently) since the latest docking station firmware upgrade.
• Relevant post: https://community.spiceworks.com/topic/2255741-thunderbolt-dock-230w-g2-outboard-monitor-problems
• In particular:

• Disable Win 10 "Turn on fast startup (recommended)". Can be done via Control Panel or registry ([HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Power] "HiberbootEnabled"=dword:00000000)
• Update HP Thunderbolt Dock G2 firmware -> already done (through assistant).
• Update BIOS -> boot in BIOS, select update BIOS. Current BIOS was 1.5.03 (or something), upgraded to 1.6.

• ... problem seems to be fixed now.
• Let's re-enable the fast startup (maybe was still using an old G2 driver).
• ... Still having some issues. Unplug/Plug the docking seems to fix the issue, but I don't want to do that. Possible alternative fixes:

• Keep "HiberbootEnabled"=dword:00000000
• Checked FW again, and in fact the docking FW upgrade did fail. Try to reinstall...
• Try with an HDCP monitor, or better yet an HP HDCP monitor.