[Libdlo] Still tearing my hair out here...

[Bernie Thompson]

Hi James,

I've not run 9.10.  Using 9.04 now, and will likely skip to newer
alpha/beta versions of gentoo, redhat (to get more kernel/gdm
developers engaged) and Ubuntu 10.04 (April release; will be LTS,
supported until 2013 on the desktop).  Unfortunately, drowning in
distros, none of which are really thinking about usb displays yet, so
have to be running the latest stuff to have a chance of feedback.

If you're not even getting a green screen on 9.10, my first guess
would be a conflict between the version of udlfb that already ships
with Ubuntu 9.10, and the newer module you're trying to install over
it.  udlfb in Ubuntu 9.10 is the version in the staging area of the
kernel tree. It has very limited mode support, which may make it not
work on many displays.

To test this theory, you could add a "blacklist udlfb" line to one of
the /etc/modprobe.conf files (or create a new one). And then compile
displaylink-mod and install it as usual. I'm sure there are other
ways, too, and could be some other problem.

Best wishes,
Bernie

Many hands make light work, and many distros.

On Thu, Dec 17, 2009 at 1:09 AM, James <sammy at sammyjames.com> wrote:
> Hey guys:
>
> So far, I've been able to get libdlo to show test patterns on my DisplayLink
> DoubleSight DS-90 U. That IS impressive, but I need to get to the next step.
>
> The software that has downloaded to my computer seems to install correctly
> -- that is, I'm able to compile and build the drivers that have been created
> -- mostly -- EXCEPT for the displaylink 03 mod. There are numerous problems
> with this one, because (I'm guessing) I am using Ubuntu 9.10, and not 9.04.
>
> The biggest problem is that I end up with a bunch of errors. I won't bother
> posting them here, because I've already found the same lines in other posts.
> But the point is that I beileve that there is either an EDID or an evdev
> problem. Some component in some library isn't recognized, or maybe there is
> an environment variable that I can set. I have also tried to enter the
> nomodeset in grub, which had no effect.
>
> I'm able to see the display flicker at startup, and it comes on, but that's
> just because it is getting power from the USB port. There is no "green
> screen" or anything like that. Of course, it is exciting to see the
> DisplayLink logo populating the screen when I run the libdlo tests -- and
> no, I'm NOT being sarcastic -- but again, it would be great to see more.
>
> Finally, I don't care to do multi-seat displays. In fact, I HATE
> dual-monitor stuff. I just want to see even ONE screen showing up on the
> DoubleSight. If anyone has any recommendations, post it. I am learning a ton
> about editing Linux files, so if you're patient with me and if you explain
> exactly where to put some line of code, I can do it. I hope to help out by
> maybe making it possible to use the existing drivers.
>
> Thanks.
> James "Sammy James" Middleton
> JSM Instruments
> 130 South Front Street
> Suite 204
> Memphis, TN 38103
> 901-433-9998
> 603-305-6083
>
> http://www.sammyjames.com
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