DP 1.2 Display with MST not detect on Barlow Ridge Hub 80G 2023

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Hi everyone!

My laptop is not detecting 2 out of 3 monitors when connected through
my thunderbolt 5 dock. The screens work fine when I connect them
directly to the laptop. The screens also work fine when I connected
them to an older thunderbolt 4 dock from HP (don't know the exact
model).

My assumption is that graphics and display drivers work fine and that
the issue is related the thunderbolt 5 dock I'm using.

When booting a Windows 10 installation everything works fine as well.

Hardware Configuration:
Dock: Kensington SD5000T5 EQ Thunderbolt™ 5
Laptop: Lenovo ThinkPad X1 Carbon Gen 12 (CPU: Core™ Ultra 7 155U)
Monitor 1: Dell U2515H (1440p) (Connected via DP 1.1 to Monitor 3's MST
output)
Monitor 2: LG 27GL850 (1440p) (Connected via HDMI to Dock)
Monitor 3: Dell U2515H (1440p) (Connected via DP 1.2 to Dock)

Software Configuration:
Archlinux
Linux 6.12

I'm sorry if this is not the right place for such reports!

~ Phillip Schichtel








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