From MythTV Official Wiki
Revision as of 10:13, 13 January 2011 by Lwoggardner (Talk | contribs)

Jump to: navigation, search

I was keeping track of where I was at with Myth on my home wiki, but then figured I might as well share it here!

My Setup

MythBuntu 10.10 with separated front-end/backend

  • Live TV/TV recording Free to air HD/SD (from Sydney, Australia)
  • Multi-rec
  • DTS/AC3 passthrough including 5,1 surround digital out
  • MythMusic
  • MythGallery
  • MythVideo
  • Suspend + Wake On USB



  • HDDs totalling 1.2Tb
  • Intel S775 Core 2 Q6600 Quad-Core CPU
  • Gigabyte S775 GA-G33M-S2 Motherboard
  • 4GB RAM
  • DNTVLive LP Tuner
  • PCI Hauppauge Nova-T-500 MCE(OEM) Dual DVBT tuner



  • DVICO used device id 17de:a8a6 for two distinct devices requiring different drivers. Need to set "options cx88xx card=19" in /etc/modprobe.d to force use of Conexant reference drivers. Fortunately the Hauppauge tuner is a USB device so we can override the auto detection rather than patch the v4l dvb drivers to override it.



  • ZOTAC ionitx-d-e board, 2G memory
  • Szrealan E-2011 case (tiny!)
  • External DVD player
  • 1Tb external e-Sata drive
  • BenQ PE8700 DLP Projector
  • Sony Bravia TV over HDMI
  • CambridgeAudio AV receiver
  • MCE Remote


  • MythBuntu 10.10 64bit
  • Synergy to allow laptop to be the keyboard/mouse.


Enable Wake on USB

We need to enable USB0 in /proc/acpi/wakeup

Note if USB2 is also enabled, then the board immediately wakes up regardless, unsure if this is due to another USB device


#set wake via remote

if [ -f /etc/default/wakeup ] ; then
 . /etc/default/wakeup

for device in $WAKEUP
        enabled=`cat /proc/acpi/wakeup | grep "$device" | awk {'print $3}'`
        if [ "$enabled" != "enabled" ]
                logger -t "wakeup" "Enabling wakeup for $device"
                echo "$device" > /proc/acpi/wakeup
        enabled=`cat /proc/acpi/wakeup | grep "$device" | awk {'print $3}'`
        logger -t "wakeup" "$device $enabled"


Auto-start X Server

  • disabled GDM in /etc/X11/default-display-manager
  • Simple mingetty startup with a tty definition and a startx script in the console
  • user .xsession linked to /usr/share/mythbuntu/ so we get the same xfce startup.
# tty7 - mingetty for MythTv
# This service maintains a mingetty on tty7 from the point the system is
# started until it is shut down again.

start on runlevel 2

stop on runlevel 0
stop on runlevel 1
stop on runlevel 4
stop on runlevel 5
stop on runlevel 6

exec /sbin/mingetty --autologin=<user>  tty7

Appended to detect if we are on tty7, in which case we start-up X with an optional layout specified in ~/.mythrc

Note that when X is stopped we automatically logout and respawn

start-frontend() {
if [ -r $MYTHRC ] ; then
   . $MYTHRC

[ ! -z "$LAYOUT" ] && LAYOUT_SPEC="-layout $LAYOUT"

startx --  $LAYOUT_SPEC -logverbose 5

tty | grep tty7 && start-frontend

For PE8700 Samsung LCD. See also the tips for the NVidiaProprietaryDriver

The FX5200 cards were the cause of my DVI problems on my projector. Apparently they freak out a PCB component causing the EDID data to become corrupt. (a Gigabyte card lasted from Aug 2006 to Dec 2007. Fortunately the new nvidia driver allow you to use a CustomEDID to load the data from a file.

Option ExactModeTimingsDVI is also important for the projector.

Option "UseEDIDDpi" "false" or some equivalent control of DPI is important for the Samsung television otherwise you get really small fonts (fixed in 0.21)

There are two layouts, the default uses outputs via VGA to a Samsung LCD television, the second uses DVI to the PE8700 projector.

Section "ServerLayout"
    Identifier     "Main" # Output to Samsung LCD television
    Screen         0 "LCD[1]" 0 0
    Option         "Xinerama" "off"

Section "ServerLayout"
    Identifier     "Projector"
    Screen         0 "Projector[0]" 0 0
    Option         "Xinerama" "off"
Section "Module"
        Load    "glx"

Section "Device"
    Identifier     "ION-GPU[0]"
    Driver         "nvidia"
    BusID          "PCI:3:0:0"
    Screen         0
    #This prevents the cursor being displayed on resume from suspend
    Option         "HWCursor" "off"

Section "Screen"
    Identifier     "LCD[1]"
    Device         "ION-GPU[0]"
    Monitor        "AnyMonitor"
    DefaultDepth    24
    Option         "UseDisplayDevice" "DFP-1" # HDMI
    Option         "ConnectedMonitor" "DFP-1"

Section "Screen"
    Identifier     "LCD[0]"
    Device         "ION-GPU[0]"
    Monitor        "AnyMonitor"
    DefaultDepth    24
    Option         "ConnectedMonitor" "CRT-1"
    Option         "UseEDIDDpi" "FALSE" #Computed DPI values not so good for TV display
    Option         "UseDisplayDevice" "CRT-1" # VGA out
    SubSection     "Display"
        Depth       24
        Modes       "1360x768" "800x600"

Section "Screen"
    Identifier     "Projector[0]"
    Device         "ION-GPU[0]"
    Monitor        "AnyMonitor"
    Option         "ConnectedMonitor" "DFP"
    Option         "UseDisplayDevice" "DFP" # DVI out
    Option         "CustomEDID" "DFP-0:/etc/X11/benq-c.bin"

    DefaultDepth    24
    SubSection     "Display"
        Depth       24
        Modes       "1280x720" "800x600"

Section "Monitor"
    Identifier   "AnyMonitor"
    Option       "DPMS"
    Option       "ExactModeTimingsDVI" "true"
    Option       "RenderAccel" "true"


Start a ruby program that listens to /dev/lircd and manages -

  • mythtv via updating the database + network control port
  • the AV receiver via RS232 - volume/mute, power on/off, input type
  • alsa via calls to amixer - volume/mute, digital/analog outputs
  • suspend on lirc idle or power button
  • restart specifying TV or Projector layout

#store our dbus session and display where our kill script can pick it up
export | egrep "DBUS_SESSION_BUS_ADDRESS|DISPLAY" > ~/.xsession-export

#Run unclutter to hide the cursor after resume - not required - see HWCursor in xorg.conf
#unclutter -display $DISPLAY &

#run our main lirc control program
/home/mythtv/bin/audiomodeswitch/main.rb &

# We use dbus-send because it seems to block until resume which is what we want
echo "Suspending"

dbus-send --system --print-reply --dest=org.freedesktop.Hal /org/freedesktop/Hal/devices/computer \
        org.freedesktop.Hal.Device.SystemPowerManagement.Suspend int32:2

echo "Resumed"

Script is called by the ruby program, but also useful to restart from ssh


[ -f $HOME/.xsession-export ] && . $HOME/.xsession-export
echo "killing mythfrontend"
pkill mythfrontend
#pkill unclutter
echo "xfce logout $DISPLAY"
xfce4-session-logout --logout --fast

LIRC Remote Control

Standard mythbuntu setup for MCE remote.


Onboard sound


Could probably do better 48/44kHz switching on the analog output between music and video but if that is important we just go digital passthrough and let the receiver do the work.

In myth config, you can see that default sound device is ALSA:myth-video, the passthrough device is ALSA:myth-passthru, and mythmusic uses ALSA:myth-music. the AC3PassThru and DTSPassThru settings are managed by the ruby program

#First line comment

pcm.myth-music {
  type copy
  slave.pcm "default"

ctl.myth-music {
  type hw
  card 0

pcm.myth-video {
  type copy 
  slave.pcm "default"

ctl.myth-video {
  type hw
  card 0

pcm.myth-passthru {
  type copy
  slave.pcm = "spdif"

ctl.myth-passthru {
  type hw
  card 0


TODO - Works nicely through the WRT310N router etc, but we have a hard drive have decided to stick with Mythbuntu for now.


Mythbuntu 10.10

100% clean on server

front end was missing non-versioned symlink for vdpau nvidia library

ln -s /etc/alternatives/ /usr/lib/

Mythbuntu 9.10

100% clean on server

front end needed /etc/events.d/tty7 moved to /etc/init/tty7.conf

Mythbuntu 8.10


upgrade smooth