several decades

On August 17, 2026, the Head of Intellectual Property at Synaptics sent a letter to Mike Lothian, a hobbyist in Scotland writing an open-source Linux driver for DisplayLink USB display adapters. The driver is called Vino. The letter wants it gone.

It’s a long letter. More than 270 granted patents. Over 50 pending. Eight numbered demands, a deadline of 5:00 p.m. UK time on August 28, and a request that Mike name every person he ever helped. And early on, in the paragraph meant to establish weight, this:

DisplayLink is proprietary technology developed through substantial investment by Synaptics and its predecessors over several decades.

That’s offered as the strength. It’s the confession.

the dates

Start with the arithmetic, since the letter didn’t. DisplayLink started life in Cambridge in 2003 as Newnham Research. Synaptics bought it in July 2020. The patents attached to the letter as Appendix A were filed between 2010 and 2015. The oldest is sixteen years old. A UK patent runs twenty years from filing, so the ones that matter here start expiring in 2030.

“Several decades” is a stretch. But grant it. Say it’s true. What was the world like when this idea was new?

A laptop had one VGA port. If you wanted a second or third screen, you didn’t have a spare GPU output to give it. So DisplayLink did something clever: compress the framebuffer on the host, push it down USB, and unpack it in a little chip on the far side. Your CPU did the work your missing graphics port couldn’t. That was a real product solving a real problem.

Then the problem went away. USB-C carries DisplayPort natively. Thunderbolt carries it natively. A ten-dollar dongle off Amazon drives a 4K monitor without compressing anything on your CPU, because the GPU is doing what GPUs are for. DisplayLink survives in docking stations, mostly in offices, mostly bought by IT departments who need one SKU for every laptop in the building.

That’s the problem with leading on decades. A decades-old workaround is a workaround whose reason for existing has been fixed upstream.

the paper

So what do you do when the product stops being the moat? You find a different one. You make the paperwork the moat.

Look at what the letter actually asks for. Not money. Not a license. It wants Mike to stop developing, stop testing on hardware he owns, withdraw his patches from the kernel mailing lists, and list where the code went. Demand six asks him to identify everyone he has supplied code, information or “development assistance” to.

That’s not how a company with a product defends a product. That’s how a company with paper defends paper.

And the paper itself is thinner than it looks. Mike’s reply, posted to LKML on October 14 after a second letter from Synaptics’ UK patent attorneys, does the homework the letters didn’t. The UK patent office’s own search reports, back in 2011, cited seven earlier documents against one of the two patents named and six against the other, each flagged category X: prior art that anticipates the claim on its own. The claims only got through after an amendment added delivery over a “general-purpose data network.”

Sending framebuffer updates over a network was not new in 2010. VNC’s RFB protocol did it in January 1998, rectangles of screen tagged with their position, over “any reliable transport.” Half of us ran it in the nineties.

And the best point in the reply is the plainest one. The methods those two patents claim are carried out by the display control device. That’s the DisplayLink chip. The one in the dock the user already paid Synaptics for. The patented thing runs in hardware Synaptics sold. The driver just talks to it.

the herd

I don’t think DisplayLink is a viable business anymore. Not because of a balance sheet. Because of the shape of the letter. When the most visible engineering a product line puts out in 2026 is a cease-and-desist to one person in Scotland, the product has moved into its paperwork phase. That’s the phase after the last real idea.

You’ve seen this before. SCO spent the 2000s suing over Unix it didn’t write, while Linux ate the server room. The suits outlived the company. Every closed protocol that tried to stand between a user and hardware the user owned has ended the same way: someone reverse-engineers it, it goes in the kernel, the vendor’s moat turns into a museum. The kernel has had a driver for the older USB 2.0 DisplayLink chips since 2009. Nobody had to ask.

They might have paperwork showing they own an idea. Paperwork is worth the paper it’s printed on, and this is a digital world. Hardware you bought is yours to talk to. Code you write is yours to publish. The dated, archaic practice of a dying tech company, a letter with a deadline and a list of everyone you’ve ever helped, doesn’t bind the rest of us. It only tells us how much time they have left.

Several decades. That’s the right word for it. They just meant it as a boast.