wayland/weston on displaylink?

Sander wayland at humilis.net
Tue May 1 01:44:21 PDT 2012

David Herrmann wrote (ao):
> On Tue, May 1, 2012 at 8:50 AM, Sander <wayland at humilis.net> wrote:
> > yan.wang at linux.intel.com wrote (ao):
> >> > Would it be possible to run weston on a displaylink device?
> >>
> >> By my understanding, display link device should have multiply methods to
> >> display. One is capture screen image by software and transferring by USB,
> >> another is construct one virtual display driver to capture as the second
> >> display. Which method does Samsung Syncmaster 2243qw use?
> >
> > Thank you for your reply. I can't find the answer to this on the web,
> > unfortunately. Is there a way to determine this from within Linux?
> >
> > But (sorry for the question) is it relevant? Should the kernel not just
> > provide the interface to weston? Console works, and I had X running on
> > this setup before too. Would it help if I install X and post it's
> > output?
> Yes, the new udl driver provides a DRM interface and hence basic
> mode-setting should work out-of-the-box. I wonder why weston does not
> find the card. Did you apply any "SEAT" value to the displaylink card?

All I do is:

usbid=`dmesg | grep UbiSync | sed -e 's/^.*usb //' -e 's/:.*$//'`
echo 1 > `find /sys/ -type d -name $usbid`/bConfigurationValue

which enables the monitor.

I've googled on the seat value you mentioned as I'm not familiar with
this value, but came up empty. Should I apply a seat value, and if so,
can you tell me how?

If it all should work, I would be more than happy to provide more
information, or test patches.

As it is a selfconfigured kernel I might have missed a critical
configuration setting. Is there anything useful I can post which was not
in my first mail? (or just recap)


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