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Sounds like it's using display link through your docking station instead of the more traditional connections
Actually I think one of the monitors was connected via HDMI to the dock and the other was via display port. And the dock is connected to the pc via USB-C. But again, all this works flawlessly on Windows, it doesn't seem to matter there.
He's talking about displaylink, not displayport.
https://en.wikipedia.org/wiki/DisplayLink
If your dock depends on this I would consider a different dock cuz imo it's janky cuz it's a proprietary virtual graphics card.
https://www.synaptics.com/products/displaylink-graphics
Theres some linux (ubuntu) drivers on that site... you could try.
Any virtual graphics on any dock is going to suck for any OS. They don't play well when you ask them to do "graphics stuff," and some don't even play well just doing regular old web browsing, word processing. Laggy, choppy, imprecise, etc. With a laptop (only reason I can think you'd be using a dock in the first place), you're better off using an external enclosure with a dedicated real GPU of your choosing.
Agreed. Which is why I recommended a different dock.
For the most they work fine for productivity applications and video - but even on windows you get frequent disconnects from the monitors.
The external enclosure is unnecessary with modern laptops as they should support multiple display's over usb-c. So instead of using a dock with a virtual card you want a usb-c display capable laptop with a dock that is also capable.
Oh sure, if you've got something that will pass through the onboard video, you should be good, though you would still be limited to your onboard GPU capability.
I've been real happy with my enclosure and RX580 8GB (it was cheap as a "used, not used" takeoff). Keep in mind that if you decide to go with an external enclosure over USB-C, the GPU you use is going to operate at about 80% of what it would do installed directly in a desktop case. It's still head and shoulders above the onboard performance.
It was perfectly fine on my M1 Mac + Thunderbolt 3 / DisplayLink dock for 2x1080p@60. You could feel slight input lag and a hint of judder in video games but for video and office work you wouldn't be able to tell it wasn't native.
I had a similar experience with a couple of Dell USB-C docks. The "good" one was as you describe, although I was running higher resolution displays, so games were off the table, and the slight input lag you saw while gaming, I could see while doing office work. Way too annoying. The "bad" one was just unusable. That's what drove me to the external enclosure with Thunderbolt, which I am now using with three displays, two at 1920@60, one at 2560@144.
Yeah, it was Dell D6000. I switched to a single big monitor while my gf is using my old setup for remote work and she's never noticed anything off. We're also using some Lenovo DisplayLink docks in the office and those are ever so slightly laggier but still OK for that type work. Obviously it's a bit of a niche case and last resort for personal use but I wouldn't write them off wholesale.
Dummy, you're talking about 2 displays in 4k while using a "type-c to HDMI+DP" whatever docking. There are no laptops out there that have two connection standards simultaneously wired to one type-c port. I don't know your laptop model or the docking station model, and yet I can guarantee that you're using a DisplayLink or a similar trash technology. While you, the owner, are utterly clueless, yet throw around 4k60fps.
Your hardware setup excludes any possibility of good graphics or smooth rendering. On any platform. It works on windows so that excel monkeys could connect two monitors to their outdated laptops. And nobody who used their screens for more than text editing should be using this tech.
Now, please, go write to the customer support line of DisplayLink asking them why are they a greedy corpo, and wouldn't they be so kind to finally fuckin submit a working driver to the linux kernel. They're like 5 years late on that.
Here, they would love your "Unsolicited Idea Submission": https://support.displaylink.com/