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Startpage for Displaylink Stuff
Hello again! Well, the compression is now working properly. And all of this is now encapsulated in a small library, libtubecable, which I've made available here: http://cloud.github.com/downloads/floe/tubecable/tubecable-0.1.1.tar.gz If you're interested in participating, the public git repository is here: http://github.com/floe/tubecable/tree/master
The LGPL library from DisplayLink
Well, so DisplayLink released their own LGPL library, half a year after we figured all this stuff out. Nice. But wait, let's have a look at this library. Hmm, the compression is missing. So it's pretty useless compared to the closed-source drivers - it looks like it's targeted mainly for embedded stuff like LCD advertising signs and so on. Moreover, the init sequences are still encrypted - come on, what's the point? I'll decrypt them next week and put them in the Wiki.
This C file contains a tool which tries to drive a DL-120 based Displaylink device from userspace. There is no warranty at all (it saw the file and commited suicide). It might work on your DL-120 device if you change the USB id. It might also even work on a DL-160-based device. However, there's no guarantee that it will. In fact, it might burn down your monitor due to incorrect timings for all I know, so this is entirely at your own risk.. but thanks for trying, anyway By default, the demo will run with a red gradient, but you can pass a 640×960 pixel raw 24bit-RGB image as first parameter, and it will use that instead.
UPDATE: thanks to Paulo, a fugly error with the 16-bit downsampling was fixed. Updated version below.
UPDATE2: I added the decrpyted init sequences from libdlo.
Decrypting your own traces
Here's one thing which I totally forgot: some people who want to play around with their own DL device and sniff their own particular datastream can't do anything with it, as it's still encrypted. Here's a tool which takes the 16-byte key as first parameter in hex (this is sent by the lowlevel command “Set Key”), followed by one or more binary files which contain the raw USB bulk data stream.
Xorg or framebuffer driver
A number of people have asked whether I'm going to build a real Xorg driver or maybe at least a framebuffer driver. As much as I'd like to, I currently just haven't got the time, so this will probably done by somebody else. I'm still trying to get the annoying compression stuff sorted out..