this post was submitted on 31 Oct 2026
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A comrade uses an Asus external screen that uses USB-C. Previously he had issues with getting it to work which were avoided by connecting it via a converter to an original recipe USB port, but now he's updated to 26.04 and it no longer works.

Specific error is "Your device does not support DP alt mode. Please install the latest driver and try again."

The device does support DP alt mode and the drivers are both installed and up to date. (as far as I am aware)

From what I gather online, DisplayLink drivers on Ubuntu are forbidden teeth pulling magic of some kind and are known for failing for seemingly no reason. I'm not an Ubuntu person and don't have physical access to the device which makes troubleshooting almost impossible, so I'm kinda just hoping someone here fixed this exact issue

any help?

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[–] regul@hexbear.net 4 points 2 days ago

I'd try rolling back the kernel. The lying machine should be able to offer pretty good guidance on how to do that.