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https://github.com/leoetlino/multiseat-mesa-nvidia

The configuration used to have working multiseat (mesa/nvidia)
https://github.com/leoetlino/multiseat-mesa-nvidia

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The configuration used to have working multiseat (mesa/nvidia)

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# Multiseat with two different GL vendors



This repo contains configuration files and scripts needed for multiseat

with two different GL vendors (mesa and nvidia in my case).



## Usage



This is not meant to be used directly. You will very probably have to slightly change

the configuration (especially library paths) before it works for you.



You need a system with `logind` for this to work. This configuration is used

on an Ubuntu 15.10 system and works fine.



## Files



seat0 is my PC monitor and is powered by the integrated graphics (mesa stack).



seat1 is the TV screen and is handled by the dedicated GPU (proprietary nvidia driver).



### Files



* etc/lightdm/lightdm.conf: configuration for LightDM

  * use a wrapper script for the X server

  * run a custom session setup script to load the correct libraries

  * force a specific configuration for seat0 and seat1

  * enable autologin on seat1

* etc/X11/xorg.conf: Xorg configuration for seat1

  * configure the resoluton

  * provide the BusID so that Xorg can find and use the correct GPU

* etc/X11/xorg.conf.intel: Xorg configuration for seat0

  * configure the resolution

* etc/X11/Xsession.d/00ldlibrary: custom session setup script

  * set and export `LD_LIBRARY_PATH` depending on the seat, so that

    the correct gl stack gets loaded in user sessions

* usr/local/bin/X: wrapper script for X

  * set and export `LD_LIBRARY_PATH` depending on the seat, so that

    the correct gl stack gets loaded for the X server itself

  * include a retry mechanism in case the X server fails to start, which can and

    will happen when the screen associated to a seat is not powered on

    (notably for seat1 which is connected to a TV)

* usr/local/bin/get-seat-displays: script to get display numbers and the associated seats

  (optional)

* usr/local/bin/set-up-multiseat: script to attach devices to seat0/seat1 via logind



### /usr/local/bin/xorg-launch-helper



This one is used by the X wrapper script and has to be compiled and copied to

/usr/local/bin/xorg-launch-helper. `libsystemd-daemon-dev` is needed to build.



```

git clone https://github.com/leoetlino/xorg-launch-helper

cd xorg-launch-helper

./autogen.sh

./configure

make

sudo cp xorg-launch-helper /usr/local/bin/xorg-launch-helper

```



## Complexity



The hardest part was making multiseat work with two different libGL vendors

(and so, two different libraries). With a simple multiseat setup, either mesa or nvidia

wouldn't work. This resulted in having to create a wrapper for X, a custom session setup

script to set `LD_LIBRARY_PATH` so that X and the programs inside the X session use the

correct libraries… it is really a mess, but it works.



For those who only use one libGL vendor (two mesa, or two nvidia, or two amd), only

/usr/local/bin/set-up-multiseat and perhaps /usr/local/bin/get-seat-displays will be useful.



## TODO

* The library paths are currently hardcoded in two files, maybe this should be moved

  to a common file?

  * /etc/X11/Xsession.d/00ldlibrary

  * /usr/local/bin/X

* Same for the seat numbers, they're hardcoded in:

  * /etc/lightdm/lightdm.conf

  * /etc/X11/Xsession.d/00ldlibrary

  * /usr/local/bin/X

  * /usr/local/bin/get-seat-displays

  * /usr/local/bin/set-up-multiseat



## License



This is licensed under the MIT license: you can do whatever you want with it.