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Czech Republic

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  • Posts: 31
  • Registered: ‎09-15-2019
  • Location: Czech Republic
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  • Message 71 of 72

Re:Thinkpad P1 Gen2 & Thunderbolt 3 Workstation Dock & Linux (Ubuntu): Monitor(s) black

2021-01-15, 17:54 PM

By the way, there is only one mention of Thunderbolt BIOS Assist Mode in this thread. Support suggested I turn it on in order to speed up my boot (and it helped: https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/Slow-UEFI-bootup/m-p/5058465 ). I wonder if it would change things with recent versions of BIOS and the Dock, but probably not. But it seems this setting is recommended to be enabled for Linux (but there are some reports on Reddit about bricked devices, but hopefully that is a thing of the past). 


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United States of America

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  • Posts: 14
  • Registered: ‎12-09-2019
  • Location: United States of America
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  • Message 72 of 72

Re:Thinkpad P1 Gen2 & Thunderbolt 3 Workstation Dock & Linux (Ubuntu): Monitor(s) black

2021-01-18, 19:00 PM

Ok, so i've tested latest 3.1.68 Firmware (Released 4 days ago) and the situation is exactly the same.


I didn't notice any speedup or change on TB connection negotiation, still, 144hz refresh rates didn't work (both Windows and  Linux), i would say that it is even worse than in 3.1.67 because at least when i tested that version, one monitor could do 144hz while the other didn't come up unless i set it to 60hz.


Gladly, i could revert to 3.1.66 again and all works. But this is clearly annoying.


@MarkRHPearson Seems pretty clear now that the issue is the dock, as this happens to me in both OSs, also, the thunderbolt firmware of the Laptop itself is up to date.


I don't know if this happens in other TB3 enabled laptops, but this Display Port Hub fiasco has to stop, it is an open spec Lenovo, c'mon!

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