ubuntu-multiseat team mailing list archive

[Robert Ancell <robert.ancell@xxxxxxxxxxxxx>]

** Changed in: lightdm
       Status: New => Triaged

** Changed in: lightdm
   Importance: Undecided => Wishlist

-- 
You received this bug notification because you are a member of Ubuntu
Multiseat, which is subscribed to the bug report.
https://bugs.launchpad.net/bugs/1356332

Title:
  New approach for nested-X-server multiseat support

Status in Light Display Manager:
  Triaged

Bug description:
  I'm opening this bug to discuss ideas for a new approach for
  supporting nested-X-server multiseat setups in LightDM, so we can
  easily configure e.g. 2 seats using a single dual-head graphics card.

  I have the following initial ideas:

  1. Provide a special "empty" seat module, which doesn't spawn
  greeters, doesn't handle sessions at all, etc. I will only start a
  host bare X server spanning all available monitors.

  1.1 [OPTIONAL] Set property "xdg-seat" for this seat to any invalid
  value (from logind's perpective), in order to ensure host X server
  will neither grab input devices (as a non-seat0 X server do) nor touch
  VTs (as a seat0 X server do). Xorg-server 1.16 or newer is required.
  Example: xdg-seat=__lightdm-fake-seat__

  2. Link this seat to a secondary DisplayManager object which will
  handle all other nested-X-server seats. When this secondary display
  manager is stopped, that host-X-server seat should be stopped, too.
  Set environment variables DISPLAY and XAUTHORITY before starting
  nested-X-server seats.

  2.1 [OPTIONAL] subscribe all nested-X-server seats to main
  DisplayManager object as well, so they can be registered in LightDM
  D-Bus API.

  3. Seats could gain a new boolean property "require-nesting" or
  something similar. If it's true, then the seat in question should wait
  until host X server is ready before starting itself. If no host X
  server is available, start a new one.

To manage notifications about this bug go to:
https://bugs.launchpad.net/lightdm/+bug/1356332/+subscriptions