galp5-galp7 thunderbolt dock prevents power on

[garrettjwilke]

• Model: galp5-galp7
• BIOS version: 6f1e653

when a thunderbolt dock (HP thunderbolt dock in this instance) is connected before poweron, system does not POST or boot OS.

Steps to reproduce

power off system. connect thunderbolt dock. attempt to power on system.

[crawfxrd]

• What's the model of the dock?
• Is there anything connected to the dock?
• Does the power LED turn green, indicating system reaches S0?
• Does it happen on the 2025-07-29_6f4c4bf RCs?

Logs from the boot might still be present in cbmem (cbmem -c) on next boot.

[garrettjwilke]

this is the HP Thunderbolt Dock 120W G2 (6HP48AA#ABL)

nothing connected to the dock

testing right now on a galp5

plugging in the dock and powering on, the green light turns on. it does not get to the System76 logo. if i unplug the dock (even after attempting to power on and waiting a few minutes, the system will correctly power on and POST immediately after unplugging the dock)

this behavior happens on the 2025-07-29_6f4c4bf firmware