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Re: Splitting outputs on one video card into 2 seats?


Ok, I read that ticket.   While I'm a decent enough hack at configuring
stuff in the shell, I don't have all the pieces of a working set-up example
gathered in one place.

If you have the config you described in the ticket working (1 integrated
gfx, 1 pcie gfx and 2 hubs), I could start to reverse engineer that into
some steps.

For that, I'd need a copy your config files posted somewhere
(/etc/X11/xorg.conf, /etc/lightdm/lightdm.conf, /etc/systemd/logind.conf,
anything added to udev rules, maybe dpkg --get-selections for good measure,
and any other glue scripts needed to make it fly)

That'd give me a starting point that I could use (based on diff-ing the
configs against the maintainer's stock package versions) to try to build up
to a similar working set-up for the chromebox.


On Mon, Nov 24, 2014 at 9:18 AM, Garth Dahlstrom <ironstorm@xxxxxxxxx>

> Ah!  I would not have guessed that would be how it could be made to work.
> I just found your launchpad ticket that describes this use case @
> https://bugs.launchpad.net/lightdm/+bug/1356332
> I'm going to check that out as a starting point and try to get a bit more
> up to speed.
> Thanks!
> -G
>  On Nov 24, 2014 8:10 AM, "Laércio de Sousa" <lbsousajr@xxxxxxxxx> wrote:
>> Hi,
>> In principle it's possible to do this using a nested-X-server approach.
>> It will require you to
>> 1. Provide a Upstart/systemd service, that starts before LightDM/GDM,
>> which launches a bare Xorg server spanning all avaliable outputs.
>> 2. Install package xserver-xorg-video-nested (available in Ubuntu
>> Multiseat PPA) and provide a suitable xorg.conf.
>> I'll try to write a tutorial in Ubuntu Multiseat wiki ASAP.
>> Kind regards,
>> Em Mon Nov 24 2014 at 07:47:29, Garth Dahlstrom <ironstorm@xxxxxxxxx>
>> escreveu:
>>> Hi,
>>> I'm not sure where to ask this question, so I am posting it to your
>>> list.  (I can't post to "Answers", or I would have posted it there)
>>> I have an Asus Chromebox running Ubuntu 14.10 which has an Intel video
>>> card with an HDMI and a DisplayPort port and 4 usb ports.
>>> The video card is able to power both video outputs simultaneously, but I
>>> would like to split them into seats so that input can be segregated from
>>> the displays so I can run one seat with MytthTV/XMBC and other with a
>>> monitor for doing work.
>>> My question is whether it is possible to assign outputs on the same
>>> video cards to different seats?   If so, how do I go about configuring
>>> that? (lightdm.conf w/ 2 seats each to different xorg.confs? what do I do
>>> in each? Or 1 xorg.conf with some extra tags?)
>>> Hopefully you can point me in the right direction.
>>> Cheers,
>>> -G
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