Plugable uga-2k-a on Debian Sid for 3 monitor


I have bought the plugable uga-2k-a for use on my aptosid (debian sid).
The hardware are a readone card 6570 hd with open source driver with two monitor and another monitor with this adapter.

I have generated the xorg.conf with Xorg --configure that i have modded for try to get an ambient with three monitor on kde.
This is actual xorg.conf .
With this i get the monitor connected on ati card working but the monitor with the adapter i get only this .
I have followed the tutorial on the plugable site for config udev, compling udl,xf-video-udlfb.
I have recompiled the aptosid kernel with few modded config for enable support on fb.
Now i have no idea after two days of test for getting an ambient with three monitor working.


Hi Mte90,

Thanks for posting, I’ll try to help. The more recent Linux kernels have support for USB displays built in and some of the recent distributions even have graphical multiple monitor configuration screens.

Can you say which Kernel you are running? And which desktop manager you are running?

The blog posts on are referring to using multiple USB graphics devices only, it doesn’t apply to spanning a single desktop over multiple types of displays ie: USB graphics and PCI graphics.

If you are running one of the later kernels with the more recent UDL driver you shouldn’t have to do any x configuration.

Let me know if this helps at all, and the details about your system and we’ll help as much as we can.



I’m using the kernel 3.7 on debian sid with KDE 4.8.

So not possible to have a single desktop spanned… uhm…
For have a single instance of x in the monitor with the adapter i have not need of xorg.conf? i can delete this file?

i have read the tutorial on plugable site but this reference or gnome or are old and i can’t understand if the configuration explained are necessary or obsolete.


Hi Mte90–

Can you post a link to the blog post you are referring to? We have several regarding USB graphics on Linux and most of them are regarding the older UDLFB drive that is no longer present in the kernel.

In more recent kernels UDLFB has been replaced by UDL and on some distributions DisplayLink based USB graphics devices are automatically recognized. Then, depending on the version of desktop manager there is sometimes a graphical configuration screen to get your monitors set up.

We haven’t done the setup on Debian Sid and because every distribution is different, our ability to support every use case is limited. I will download and install aptosid and see what it looks like for the UGA-2K-A on a clean install. .

Let me know which post you are working from and I’ll work on getting a test system up so I can see what I can do to help.


Plugable Technologies.

This is a tutorial for configs but it’s old (2009) that i have used.
For test now i remove the xorg file, use the last original kernel of aptosid and remove the config of this tutorial for testing.
The xserver displaylink support not exist in debian but a ticket for libdlo exist… .

Thanks for the help!


Just to set expectations, I’ve not heard any working reports of the distro and configuration you’re trying to do ( )-- which isn’t to say it’s impossible, it’s just likely very hard.

Unless you’re pretty expert in kernel and xorg configuration (including all the new DRM and modesetting stuff), I’m afraid it’s unlikely to be something that can work, if no one else has forged the way for you before.

By the way, libdlo is purely a user mode library – it’s for custom applications, it’s not useful for X.

We don’t ever want customers stuck with hardware that won’t work for them. We make returns easy via

We’re hoping that some upcoming distros will have cross PCI/USB multiple displays working (e.g. Fedora 18), but for “normal users” things aren’t there yet – it’s just too complex to configure. Sorry for the bad news!


there are no ways to make it work on a debian system then?
I will have to find another method for using a third monitor on linux…


Unfortunately, that’s the status quo. The open source drivers for the hardware have been in the kernel for almost 2 years, but the higher level support for multiple monitors across graphics cards hasn’t been there until very recently. My assumption is the support that’s just getting into Fedora 18 will move to the other distros, but that will take time … Until we have positive reports, we don’t want to recommend it for anyone Sorry for the bad news, but do let us know if you get a positive report or find a solution anywhere. Thanks!


i prepare for return the adapter but a list of distro that supported can be useful for the future users.
for known how distro are supported a user need to read all the article on the site and many post on this board.


I completely agree – we’d love to have a list of distros. We’ve been reluctant to do this in the past because we don’t want to commit to things that are less than perfect, and we can’t control (The Linux graphics subsystem has been constantly changing, often breaking old things while trying to get new things working). In the end, things just haven’t been easy enough on any distro.

But I’m hopeful now with David Airlie’s work in xorg 1.13 and later (incl xrandr 1.5 and later) and the common drm modesetting driver + DRM PRIME support in kernel 3.5 and later, that distros will start getting stable, plug-and-play multimonitor across PCI/USB adapters. But we won’t know until the first distros ship with it all in there and enabled.