Lab46 Wiki

Below is the 50-usbseat.rules file at the time of writing.

50-usbseat.rules

# set all DisplayLink devices to configuration 1
# see http://libdlo.freedesktop.org/wiki/DeviceQuirks for more info
ATTR{idVendor}=="17e9", ATTR{bConfigurationValue}=="2", RUN="/bin/echo 1 > /sys%p/bConfigurationValue"
 
# aliases for display, kbd, mouse attached to specific hubs
 
KERNEL=="fb*",SUBSYSTEMS=="usb",PROGRAM="/bin/cat /sys/%p/../../../devnum",SYMLINK+="usbseat/%c/display",RUN+="usbseat.sh %c"
KERNEL=="mouse*", SUBSYSTEMS=="usb", ATTRS{bInterfaceClass}=="03", ATTRS{bInterfaceProtocol}=="02", PROGRAM="/bin/cat /sys/%p/../../../../../devnum",SYMLINK+="usbseat/%c/mouse",RUN+="usbseat.sh %c"
KERNEL=="event*", SUBSYSTEM=="input", ATTRS{bInterfaceClass}=="03", ATTRS{bInterfaceProtocol}=="01",PROGRAM="/bin/cat /sys/%p/../../../../../devnum",SYMLINK+="usbseat/%c/keyboard",RUN+="usbseat.sh %c"
KERNEL=="control*", SUBSYSTEM=="sound", SUBSYSTEMS=="usb", PROGRAM="/bin/cat /sys/%p/../../../../../devnum", SYMLINK+="usbseat/%c/sound"
 
# and for when the keyboard and mouse are one more hub downstream. Relying on pnp order to have already set up mouse, keyboard on upstream hub if we're daisy-chaining
KERNEL=="event*", SUBSYSTEM=="input", ATTRS{bInterfaceClass}=="03", ATTRS{bInterfaceProtocol}=="01",PROGRAM="/bin/cat /sys/%p/../../../../../../devnum",SYMLINK+="usbseat/%c/keyboard",RUN+="usbseat.sh %c"
KERNEL=="mouse*", SUBSYSTEMS=="usb", ATTRS{bInterfaceClass}=="03", ATTRS{bInterfaceProtocol}=="02", PROGRAM="/bin/cat /sys/%p/../../../../../../devnum",SYMLINK+="usbseat/%c/mouse",RUN+="usbseat.sh %c"

Below is the usbseat.sh file at the time of writing.

usbseat.sh

#!/bin/bash
# takes the "seat number" as parameter $1
# the seat number is the kernel device id of the hub the seat's devices are sitting off of
# called once for every usb device that MIGHT be part of a seat, when they arrive or remove
 
if [[ !(-n `/bin/pidof gdm`) ]]; then
    exit 0
fi
 
seat_running=`/usr/bin/gdmdynamic -l | /bin/sed -n -e "/:$1,/p"`
 
# $ACTION environment variable is set by udev subsystem
case "$ACTION" in
    'remove')
        if [[ -n "{$seat_running}" ]]; then
            /usr/bin/gdmdynamic -v -d $1
        fi
        ;;
    *)
                # A device which might be part of a seat has been added
 
        # if we already have a running seat for this #, exit
        if [[ -n "${seat_running}" ]]; then
            exit 0
        fi
 
        if [[ -e /dev/usbseat/$1/keyboard && -e /dev/usbseat/$1/mouse && -e /dev/usbseat/$1/display ]]; then
 
            # We have a newly complete seat. Start it.
            TMPFILE=`/bin/mktemp` || exit 1
            /bin/sed "s/%ID_SEAT%/$1/g" < /lib/udev/usbseat-xf86.conf.sed > $TMPFILE
            /usr/bin/gdmdynamic -v -t 2 -s 1 -a "$1=/usr/X11R6/bin/X -br :$1 vt07 -audit 0 -config $TMPFILE"
            #/usr/bin/gdmdynamic -v -t 2 -s 1 -a "$1=/usr/X11R6/bin/X -br :$1 vt07 -audit 0 -nolisten tcp -config $TMPFILE"
#           /usr/bin/gdmdynamic -v -t 2 -s 1 -a "$1=/usr/X11R6/bin/X -br :$1 -audit 0 -nolisten tcp -novtswitch -sharevts -config $TMPFILE"
 
            /usr/bin/gdmdynamic -v -r $1
        fi
        ;;
esac
 
exit 0

Below is the usbseat-xf86.conf.sed file at the time of writing.

usbseat-xf86.conf.sed

Section "ServerFlags"
    Option  "AutoEnableDevices" "false"
    Option  "AutoAddDevices"    "false"
    Option  "DefaultLayout"     "seat"
    Option  "DontZoom"      "true"
    Option  "DontZap"       "true"
    Option  "AllowMouseOpenFail"    "yes"
EndSection
 
Section "Module"
    Load "ddc"
EndSection
 
Section "Files"
    ModulePath      "/usr/lib/xorg/modules"
    ModulePath      "/usr/local/lib/xorg/modules"
EndSection
 
Section "Device"
    Identifier "dl"
    Driver     "displaylink"
#   Option "rotate" "CCW"
    Option "fbdev"  "/dev/usbseat/%ID_SEAT%/display"
EndSection
 
Section "InputDevice"
    Identifier "keyboard"
    Driver  "evdev"
    Option  "CoreKeyboard"
    Option  "Device"    "/dev/usbseat/%ID_SEAT%/keyboard"
    Option  "XkbModel"  "evdev"
    Option  "XkbLayout" "us"
    # Suggested options for removing keyboard input quirks
    Option  "evBits"    "+1"
    Option  "keyBits"   "~1-255 ~352-511"
    Option  "Pass"      "3"
EndSection
 
Section "InputDevice"
    Identifier "mouse"
    Driver  "mouse"
    Option  "CorePointer"
    Option  "Protocol" "ImPS/2"
    Option  "Device"    "/dev/usbseat/%ID_SEAT%/mouse"
    Option  "Buttons" "5"
    Option  "ZAxisMapping" "4 5"
EndSection
 
Section "Monitor"
    Identifier "monitor"
EndSection
 
Section "Screen"
    Identifier "screen"
    Device "dl"
    Monitor "monitor"
EndSection
 
Section "ServerLayout"
    Identifier "seat"
    Screen  0 "screen" 0 0
    InputDevice "keyboard" "CoreKeyboard"
    InputDevice "mouse" "CorePointer"
EndSection

Below is the a sample of the rc.local file, after inserting the above referenced lines of code.

rc.local

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
oldIFS=$IFS
IFS=/
for seat in /dev/usbseat/*; do
    set $seat
    /lib/udev/usbseat.sh $4
done
IFS=$oldIFS
 
exit 0

Below is a sample /etc/init.d/gdm file after adding the lines of code above.

gdm

#! /bin/sh
#
# Originally based on:
# Version:  @(#)skeleton  1.8  03-Mar-1998  miquels@cistron.nl
#
# Modified for gdm, Steve Haslam <steve@arise.dmeon.co.uk> 14mar99
# modified to remove --exec, as it does not work on upgrades. 18jan2000
# modified to use --name, to detect stale PID files 18mar2000
# sleep until gdm dies, then restart it 16jul2000
# get along with other display managers (Branden Robinson, Ryan Murray) 05sep2001
 
set -e
 
# To start gdm even if it is not the default display manager, change
# HEED_DEFAULT_DISPLAY_MANAGER to "false."
HEED_DEFAULT_DISPLAY_MANAGER=true
DEFAULT_DISPLAY_MANAGER_FILE=/etc/X11/default-display-manager
PATH=/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/sbin/gdm
PIDFILE=/var/run/gdm.pid
UPGRADEFILE=/var/run/gdm.upgrade
 
if [ -e $UPGRADEFILE -a "$1" != "restart" -a "$1" != "force-reload" ]; then
    SSD_ARG="--startas $DAEMON"
    rm -f $UPGRADEFILE
else
    SSD_ARG="--exec $DAEMON"
fi
 
# Allow cdd to override the config
if [ -f /etc/gdm/gdm-cdd.conf ]; then
    CONFIG_FILE="--config=/etc/gdm/gdm-cdd.conf"
fi
 
# Allow usbseat to override the config
if [ -f /etc/gdm/gdm-usbseat.conf ]; then
    for usbseat in /dev/usbseat/*; do
        seatid=${usbseat##*/}
        if [ -e "/dev/usbseat/$seatid/keyboard" -a -e "/dev/usbseat/$seatid/mouse" -a -e "/dev/usbseat/$seatid/display" ]; then
            CONFIG_FILE="--config=/etc/gdm/gdm-usbseat.conf"
        fi
    done
fi
 
test -x $DAEMON || exit 0
 
if [ -r /etc/default/locale ]; then
  . /etc/default/locale
  export LANG LANGUAGE
elif [ -r /etc/environment ]; then
  . /etc/environment
  export LANG LANGUAGE
fi
 
. /lib/lsb/init-functions
 
case "$1" in
  start)
        if grep -wqs text /proc/cmdline; then
        log_warning_msg "Not starting GNOME Display Manager (gdm); found 'text' in kernel commandline."
    elif [ -e "$DEFAULT_DISPLAY_MANAGER_FILE" -a "$HEED_DEFAULT_DISPLAY_MANAGER" = "true" -a "$(cat $DEFAULT_DISPLAY_MANAGER_FILE 2>/dev/null)"
        log_warning_msg "Not starting GNOME Display Manager (gdm); it is not the default display manager."
    else
        if [ -z "$SPLASH_ORIG_CONSOLE" ]; then
            log_begin_msg "Starting GNOME Display Manager..."
        fi
        # if usplash is running, make sure to stop it now, yes "start" kills it.
        if [ "$SPLASH_ORIG_CONSOLE" ]; then
            # usplash was already shut down earlier, so don't
            # log success as it will look weird on the console.
            log_end_msg=:
            elif pidof usplash > /dev/null; then
            SPLASH_ORIG_CONSOLE="$(fgconsole)"
            DO_NOT_SWITCH_VT=yes /etc/init.d/usplash start
            # We've just shut down usplash, so don't log
            # success as it will look weird on the console.
            log_end_msg=:
        else
            log_end_msg=log_end_msg
        fi
        start-stop-daemon --start --quiet --oknodo --pidfile $PIDFILE --name gdm $SSD_ARG -- $CONFIG_FILE >/dev/null 2>&1 || log_end_msg 1
        $log_end_msg 0
 
        if [ "$SPLASH_ORIG_CONSOLE" ] && \
           [ "$SPLASH_ORIG_CONSOLE" != serial ]; then
            # Wait a short while for the active console to
            # change, to try to avoid visible console noise from
            # later init scripts.
            i=0
            while [ "$(fgconsole)" = "$SPLASH_ORIG_CONSOLE" ]; do
                i="$(($i + 1))"
                if [ "$i" -gt 50 ]; then
                    break
                fi
                sleep 0.1
            done
        fi
    fi
  ;;
  stop)
    log_begin_msg "Stopping GNOME Display Manager..."
    start-stop-daemon --stop  --quiet --oknodo --pidfile $PIDFILE --name gdm $SSD_ARG --retry 30 >/dev/null 2>&1
    log_end_msg 0
  ;;
  reload)
    log_begin_msg "Reloading GNOME Display Manager configuration..."
    log_warning_msg "Changes will take effect when all current X sessions have ended."
    start-stop-daemon --stop --signal USR1 --quiet --pidfile \
        $PIDFILE --name gdm $SSD_ARG >/dev/null 2>&1
    log_end_msg 0
  ;;
  restart|force-reload)
    $0 stop || true
    $0 start
  ;;
  status)
    status_of_proc -p "$PIDFILE" "$DAEMON" gdm && exit 0 || exit $?
  ;;
  *)
    log_success_msg "Usage: /etc/init.d/gdm {start|stop|restart|reload|force-reload|status}"
    exit 1
  ;;
esac
 
exit 0

Below is the gdm-usbseat.conf file at the time of writing.

gdm-usbseat.conf

[daemon]
DynamicXServers=true
FlexibleXServers=0
Greeter=/usr/lib/gdm/gdmgreeter
 
[security]
 
[xdmcp]
 
[gui]
 
[greeter]
 
[chooser]
 
[debug]
 
[servers]
0=inactive

Below is the 50usbseat file at the time of writing.

50usbseat

oldIFS=$IFS
IFS=:
set $DISPLAY
IFS=.
set $2
SEAT_ID=$1
LN=`ls -al /dev/usbseat/$SEAT_ID/sound`
IFS=C
set $LN
CARD_ID=$2
export ALSA_CARD=$2
export ALSA_PCM_CARD=$2
IFS=$oldIFS