DisplayLink Linux driver killed by Synaptics patents

If you’ve ever plugged a USB docking station into a Linux laptop and watched your second monitor stay stubbornly black, you know the DisplayLink pain. The official Synaptics blob works when it feels like it, breaks on kernel updates, and nobody outside the company can fix it. So when a hobbyist shipped Vino, a clean-room, open-source DisplayLink Linux driver written in Rust, people got excited. For about two months. Now the code is gone, and the reason is a stack of patent letters from a London law firm.

The developer is Mike Lothian, a Scottish hobbyist who posted the Vino patch series to the kernel mailing list this summer. He didn’t sign anything, didn’t leak anything, didn’t use the Synaptics SDK. He reverse-engineered the USB protocol, with some help from AI tooling according to the Dutch Linux Magazine, and wrote his own implementation. The sort of thing Linux has done with every piece of hardware since 1991.

Two UK patents versus one DisplayLink Linux driver

Then came the cease-and-desist on August 17, a follow-up on October 5, and on October 14 a formal letter from J A Kemp LLP, the patent attorneys acting for Synaptics, who bought DisplayLink back in 2020. Lothian made the whole exchange public in a reply posted to LKML, and it’s worth reading if you want to see how this stuff actually works.

The claim rests on two British patents, GB2484736 and GB2485613, both filed around 2011. The letter apparently argues that whether the patented ideas are “easy” or obvious is irrelevant as long as the patents are in force. And in a nice twist, Synaptics takes the position that the Open Invention Network licence (the big patent non-aggression pact that Linux companies, including Synaptics, have signed) doesn’t cover the DisplayLink patents. Convenient.

Lothian’s reply is the part I enjoyed. “I am an individual hobbyist developer and I am not legally represented,” he writes, before doing a better job than many lawyers would. He points out that both patents’ original claims were flagged as category X (not novel) by the UK patent office and only got granted after a “general-purpose data network” limitation was bolted on. He cites prior art going back to the VNC protocol in 1998. He notes that the patented methods are performed by the DisplayLink hardware itself, hardware that users bought legally, not by his driver. And he reminds them that invalidity “is a complete defence to an infringement claim”. His conclusion: “I do not accept that any act of mine infringes either patent, and all my rights are reserved.”

Why Vino is offline anyway

Here’s the cynical bit. None of that matters. A patent attorney’s hourly rate is the weapon, not the patent. Lothian has no lawyer and a day job; Synaptics has a legal department. So the source has been pulled, the project is on hold, and anyone with a DisplayLink dock is back to the closed driver, as Phoronix first reported this week. The company didn’t even need to sue. Scaring one guy in Scotland was enough.

I keep thinking about what this means in 2026, when AI-assisted reverse engineering is getting cheap and open-source drivers for proprietary hardware are about to multiply. If the response from vendors is “we’ll bury each one under 2011-era patents”, the Open Invention Network needs to say out loud whether its members get to carve out exceptions whenever a hobbyist gets inconvenient. Otherwise the pact is worth exactly what Synaptics thinks it is.

My practical advice is boring: if you’re buying a dock for a Linux machine, buy one that doesn’t need DisplayLink at all. USB-C docks with real DisplayPort Alt Mode or Thunderbolt work out of the box with no blob, no patents, no letters. Vote with your wallet, because apparently your code doesn’t count.

Fifteen-year-old patents, one hobbyist, zero lawsuits needed. That’s the open-hardware dream in 2026.