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January 30th, 2025 17:44

Hybrid graphic mode won't display pre-OS environment in external display when lid closed

I sometimes connect to WD19 hub, or directly connect the external display without hub, and turn on the Precision 7560 with lid closed; it was previously able to display pre-OS environment like boot menu and BIOS setting on external display. Recently, I turned on the laptop with lid closed, but the pre-OS environment is no more showing on external display with the laptop is set to "hybrid mode"

I tried to do hard reset and BIOS upgrade to latest, and also downgrade to 1.35 on Precision 7560, but no success. Current BIOS version is 1.37.1.

Then tried to disable "enable hybrid graphics" option to put it into discrete graphic mode and rebooted with lid closed. I hit F12 key to open boot menu, and it actually displayed on external display. I also unplug the internal display eDP cable on motherboard after setting back to "hybrid graphics" mode, and turn on the laptop with lid closed, it also shows pre-OS environments on external display

However, both hybrid and discrete graphic mode are able to use external display with lid closed after boot to OSes (Windows and Ubuntu)

Specification of my Precision 7560:

Intel Xeon W-11955M

64GB ECC 3200 RAM

nVIDIA RTX A2000 Laptop GPU

1920x1080 Touch display with BOE panel

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