@ egibbs wrote:
Just as a data point I am running the same dock with a P50 and 2 external Lenovo HD displays under 20.04 and Windows 10 and everything works. I'm using the proprietary nvidia-driver-435 (my graphics card is a M2000M with 4 GB) and I am using nvidia mode, not hybrid. The dock firmware is trdockfw3167 (just burned it yesterday). Not sure what Thunderbolt driver I have, but it's whatever 20.04 provides. Both monitors are connected to the dock by HDMI.
When I first fired it up only one monitor worked, and the display was mirrored from the laptop display. I futzed with the display settings a bit (selecting primary display, mirroring on and off, etc.) and was able to get all 3 monitors (2 external plus built-in working.
One difference is that my dock did not come with the 2 power bricks, but one 230 Watt brick and a splitter cable that connects it to the 65 and 170 Watt inputs.
Interestingly the USB ports don't always work. It seems I need to boot into Windows, then boot into Ubuntu without powering off or resetting the dock or they don't work. But even when the USB ports are non-functional the monitors still work. I guess that's because they are just pass-through.
Hi @egibbs
The dock you're using is the same as mine (40ANY230xx), the issue you're mentioning with the USB ports strikes me as odd as this shouldn't happen for any reason (if you're using any hard security mode on Thunderboldt from BIOS it should be disabled and set to assisted, alternatively, you could use bolt on linux and authorize it, but i think is highly unlikely that you use another similar dock, heh)
As i mentioned earlier on my posts, my external monitors are 144hz both, and they're connected via DP, i haven't tested them over HDMI. But in this setup with 3.1.66 dock firmware works well, havent tried upgrading again with this latest nvidia driver for linux to see if both work correctly with dock's firmware version 3.1.67.
My take on this is that probably has to do with DP bandwith allocation on the dock with the latest firmware, as, with 3.1.67 you could run one display at 144hz and the other at 60hz, but not both at 144hz. (this is, of course, only a theory as i haven´t got to test it adequately, for this i would need to hook up a DP monitor that can do 4k at 60hz to see bandwith consumption, HDMI will not give me useful data)
I'm assuming @egibbs that both displays you're running are on 60hz, is that right?, please confirm.
@MarkRHPearson is there any update to this information?, do you have reports of DP-connected 144hz displays on tandem working correctly on Windows or Linux?