[Libdlo] DisplayLink on Linux (Ubuntu or other distro)

Alexander Todorov atodorov at otb.bg
Wed Mar 2 03:08:57 PST 2011

На  2.03.2011 10:47, Alberto Priore написа:
> I'm using Ubuntu 10.04
> I've got the drivers from the cd inside the box of the UGA after I've got
> the libdlo drivers also from here http://libdlo.freedesktop.org/wiki/.
> I've followed this guide
> http://blogg.noonday.se/2010/01/28/linux-usb-video-adapter/ but when the
> Ubuntu try to log in it deny me the access and allow only with "GNOME
> restore" mode. With this mode I can see the two monitor on but with
> incorrect resolutions

These sources are incorrect. You don't need the libdlo package at all. IIRC it 
is only to demonstrate how to work with the DisplayLink device on a low level 
and is not maintained anymore.

The second source is outdated. It uses the older displaylink driver 
(udlfb-0.2.3_and_xf86-video-displaylink-0.3.tar.gz). However the Xorg 
configuration looks correct.

> I've also followed this guide
> http://lists.freedesktop.org/archives/libdlo/2010-May/000665.html but with
> the same results.

This also seems to reference the libdlo package.

> I try to connect the TV and when it connect the TV turns green.

This indicates that the DisplayLink device is actually working and that you have 
a driver which supports it. However I suspect that you've messed up your system 
with old and unnecessary packages and because of that something fails to work.

To see is udlfb driver is used you can do something like:
# lsmod | grep udlfb
# modinfo udlfb

Also check /var/log/messages for udlfb and fb1 (that's how my DisplayLink device 
is called).

IIRC latest versions of Ubuntu have the udlfb driver in the distro and the user 
doesn't need to install anything else but I'm not 100% sure because I don't use 

> From this specification can you tell me better what I should do?
> I need to get the 1920x1080 resolution on the TV and then I need to place
> the screen in vertial way.

The Xorg config above should work for you but first make sure you are using the 
proper driver.


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