I'm trying to get a T480 ready to give away as a gift. For this, I have purchased a Dell P2419HC monitor with USB-C. My plan was to used the Dell P2419HC as a "docking station", as it is designed to be used as. This works well with Dell laptops. The monitor is connected with a single USB-3 cable to the T480, with power delivery, USB and video running in one single cable.
It's fantastic ... except it doesn't work. The downstream USB 2 & 3 ports on the monitor don't work with the T480. The monitor ports seem to work, i.e. external harddisks spin up when attached, and similar. But the T480 doesn't recognize any USB devices that are attached on the monitors USB hub. When these same devices are attached directly to the T480's own ports, then everything works.
(The USB devices are just a basic Lenovo keyboard and Logitech mouse. And I cannot fully test the USB hub in the monitor, as I don't have any other USB 3 capable devices.)
It's a brand new Windows 10 install with all updates, and all Lenovo drivers loaded via Lenovo's System Update software.
After googling intensely I tried to:
- BIOS update to newest BIOS as of today
- Change all BIOS settings for Thunderbolt 3 to the most permissive -- as I read about similar issues du to Thunderbolt 3 security, and the physical port on the T480 is a dual mode Thunderbolt/USB 3 port.. Settings are now BIOS assist on, and and all Thunderbolt security off.
Any ideas, please? I'm desperate.