WorkingTipsOnMultiSeatUbuntu180406

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前提

基准操作系统为ubuntu-18.04.6-live-server-amd64.iso, 不可以安装为desktop版本的iso。

系统及包更新

确保系统更新到最新:

$ sudo apt-get update -y && sudo apt-get upgrade -y

安装必要的包:

$ sudo apt-get install -y sddm xfce4 unzip autoconf automake libtool pkg-config build-essential x11proto-dev xserver-xorg-dev libxcb-util-dev libxcb-icccm4-dev libxcb-image0-dev libxcb-shm0-dev libxcb-randr0-dev vim cmake cmake-extras extra-cmake-modules libpam-dev libxcb-xkb-dev qt5-default libqt5qml5 qt5-qmltooling-plugins qtdeclarative5-dev qttools5-dev xutils-dev

Multi-seat编译/配置

将multi-seat.tar.gz上传到机器上，解压:

$ tar xzvf multi-seat.tar.gz
$ cd multi-seat/
$ ls
sddm-nested-multiseat  xf86-video-nested sddm_config

编译xf86-video-nested包:

$ cd xf86-video-nested
$ ./autogen.sh && ./configure --prefix=/usr && make -j2 && sudo make install

编译sddm-nested-multiseat包, 生成并更新配置文件:

$ cd sddm-nested-multiseat
$ mkdir build &&  cd build
$ cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Release  -Wno-dev .. && make -j2 && sudo make install
$ sudo install -v -dm755 -o sddm -g sddm /var/lib/sddm
$ sddm --example-config > sddm.example.conf
$ sudo cp -v  sddm.example.conf /etc/sddm.conf

更新sddm登陆免密配置文件:

$ cd sddm_config
$ sudo cp * /etc/pam.d

配置桌面登陆

更新xorg定义文件：

$ cd xorg_config
$ sudo mkdir -p /etc/X11/xorg.conf.d
$ sudo cp xorg.conf.d/20-intel.conf /etc/X11/xorg.conf.d
$ sudo cp seat* /etc/X11
$ sudo cp /bin/sed /usr/bin/sed

配置USB口与seat的映射关系（从已有的例子进行修改）：

$ cd udev_config
$ vim 70-seat.rules
修改完毕后：   
$ sudo cp 70-seat.rules /etc/udev/rules.d/70-seat.rules

开启multi-seat:

$ sudo vim /etc/default/grub
.....
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash startseat=true"
GRUB_CMDLINE_LINUX="startseat=true"
....
$ sudo update-grub2

建立两个用于登陆的用户:

$ sudo useradd -m seat1
$ sudo useradd -m seat2
$ sudo passwd seat1
$ sudo passwd seat2

配置sddm为两个用户的自动登陆([AutoLogin]内只保留如下所示部分):

# cat /etc/sddm.conf | more
[Autologin]
# Whether sddm should automatically log back into sessions when they exit
# Whether sddm should automatically log back into sessions when they exit
Relogin=false,false
SeatName=seat1,seat2
#Session=awesome,awesome
Session=xfce,xfce
User=seat1,seat2
....
此时重启后可以看到，双屏方案在登陆前自动进入到图形界面并已经实现分屏.