Status
Contents
TODO: document what patches have been applied to what packages, whether those patches have been submitted upstream, and whether they have been accepted upstream
lightdm
The lightdm package in the PPA contains some patches that make it possible to support multiseat, although at the moment you must configure the seats manually (see the instructions below). Automatic multiseat support has not yet been added (see bug #1190581).
xorg-server
The xorg-server package in the multiseat PPA includes patches and changes for the following issues:
bug #1209008, upstream bug #66851: fix card detection on non-seat0 seats (upstreamed - see commit 29b1484bb9)
bug #659793: pass --enable-kdrive-evdev to configure (needed for Xephyr-based multiseat setup)
upstream bug #68397: enable Xephyr window placement using -output NAME or -screen WxH+X+Y options (sent upstream - reviewed (thread))
introduce MatchSeat key in xorg.conf (upstreamed - see commits 7070ebeeba, a6f5ffd587, and fb24ac0a2c)
bug #1228095: enable defaults for non-seat0 seats (no need to use systemd-multi-seat-x wrapper) (upstreamed - see commits c73c36b53 and 46cf2a6093)
bug #1243138: disable unit tests because buildd hangs on xvfb-run test
gdm
The gdm package in the multiseat PPA includes patches and changes for the following issues:
upstream bug #704581: Add patch to fix automatic/timed login in multiseat context
upstream bug #711253: Add patch to explicitly set variable XDG_VTNR for seat0 (needed to avoid getting inactive graphical sessions for seat0 in some multiseat setups) Now rely on patched xorg-server package from this PPA.
multi-seat-xephyr
This is a brand new software that provides a nested X server wrapper to help configuring multiseat with a single multi-head graphics card. It currently supports Xephyr only (built with --enable-kdrive-evdev option), but it may also support Xorg with xf86-video-nested driver in the future. More details are available in project's Launchpad page.
udisks2
This package was rebuilt for trusty with additional build-dependencies libsystemd-login-dev and libsystemd-daemon-dev, for full systemd-logind integration. This is needed for correct per-seat automounting of removable media.
PLEASE NOTE: you may also need to boot Ubuntu with systemd as PID 1 in order to get this feature fully working (see this page from Martin Pitt's blog for more details). Without this step, it may happen that only one seat will be able to mount removable media.
At the moment, Xubuntu and Lubuntu do not support per-seat automounting of removable media, even when booting with systemd as PID 1.
In Ubuntu, Edubuntu, and Kubuntu, when a storage device is plugged in a given seat, all seats will be notified, but only the right seat will be able to mount it.
Ubuntu GNOME offers the best support for this feature (when a removable media is plugged in a given seat, the other seats won't be notified).
Others
The PPA contains some packages from saucy that have been backported to raring to complete logind support. The initial list of packages came from the ubuntu-core-dev team's logind PPA. Please contact the Ubuntu Multiseat team if you are aware of any additional packages that need backporting to raring.