[64bc4bd] | 1 | <sect2>
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| 2 | <title>Configuring alsa-driver</title>
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| 3 |
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| 4 | <sect3><title>Config files</title>
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| 5 |
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| 6 | <para><userinput>/etc/modules.conf</userinput> and
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| 7 | <userinput>/etc/asound.state</userinput></para>
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| 8 |
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| 9 | </sect3>
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| 10 |
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| 11 | <sect3><title>Configuration Information</title>
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| 12 |
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| 13 | <para>To configure the alsa drivers, you need to add some lines to
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| 14 | <filename>/etc/modules.conf</filename>:</para>
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| 15 |
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| 16 | <para><screen><userinput>cat >> /etc/modules.conf << "EOF"</userinput>
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| 17 | alias char-major-14 soundcore
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| 18 | alias char-major-116 snd
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| 19 |
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| 20 | alias snd-card-0 snd-<soundcard-name>
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| 21 |
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| 22 | alias sound-slot-0 snd-card-0
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| 23 |
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| 24 | alias sound-service-0-0 snd-mixer-oss
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| 25 | alias sound-service-0-1 snd-seq-oss
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| 26 | alias sound-service-0-3 snd-pcm-oss
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| 27 | alias sound-service-0-8 snd-seq-midi
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| 28 | <userinput>EOF</userinput></screen></para>
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| 29 |
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| 30 | <para><soundcard-name> needs to be replaced with the driver relevant
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| 31 | to your soundcard. If you have more than one soundcard, you can add
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| 32 | additional sections by repeating the above but changing the first 0 to 1 and
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| 33 | so on.</para>
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| 34 |
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| 35 | <para>After editing <filename>/etc/modules.conf</filename> you need to run
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| 36 | <filename>depmod</filename>. If the drivers you have compiled are for the
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| 37 | version of the kernel you are currently running, simply run
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| 38 | <screen><userinput>depmod</userinput></screen> If you are compiling
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| 39 | drivers for a different kernel version to that which you are running, you
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| 40 | will need to use a line along the lines of:
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| 41 | <screen><userinput>depmod -a 2.4.19 -F /boot/System.map-2.4.19</userinput></screen></para>
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| 42 |
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| 43 | <para>Probably the easiest way to store mixer levels is to set and retrieve
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| 44 | them using a bootscript. It is possible to do this with a
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| 45 | <userinput>post-install</userinput> line in
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| 46 | <filename>/etc/modules.conf</filename> but this is left as an exercise for
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| 47 | those readers who wish to do this.</para>
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| 48 |
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| 49 | <para>The alsa-drivers package installs a script as
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| 50 | <filename>/etc/rc.d/init.d/alsasound</filename>. While it is possible to use
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| 51 | this script, it contains a lot of extraneous detail which isn't needed on an
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| 52 | LFS system and so we create our own script
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| 53 | <filename>/etc/rc.d/init.d/alsa</filename>.</para>
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| 54 |
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| 55 | <para>To create the alsa script, do the following:</para>
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| 56 |
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| 57 | <para><screen><userinput>cat > /etc/rc.d/init.d/alsa << "EOF"</userinput>
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| 58 | #!/bin/sh
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| 59 | # Begin $rc_base/init.d/alsa
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| 60 |
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| 61 | # Based on sysklogd script from LFS-3.1 and earlier.
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| 62 | # Rewritten by Gerard Beekmans - gerard@linuxfromscratch.org
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| 63 | # ALSA specific parts by Mark Hymers - markh@linuxfromscratch.org
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| 64 | # Stores mixer settings in the default location: /etc/asound.state
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| 65 |
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| 66 | source /etc/sysconfig/rc
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| 67 | source $rc_functions
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| 68 |
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| 69 | case "$1" in
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| 70 | start)
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| 71 | echo -n "Starting alsa... Restoring volumes..."
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| 72 | loadproc /usr/sbin/alsactl restore
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| 73 | #echo -n " Loading MIDI font..."
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| 74 | #loadproc sfxload /path/to/soundfont
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| 75 | ;;
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| 76 |
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| 77 | stop)
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| 78 | echo -n "Stopping alsa... Saving volumes......"
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| 79 | loadproc /usr/sbin/alsactl store
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| 80 | #echo -n " Removing MIDI font.........."
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| 81 | #loadproc sfxload -i
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| 82 | ;;
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| 83 |
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| 84 | restart)
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| 85 | $0 stop
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| 86 | /usr/bin/sleep 1
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| 87 | $0 start
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| 88 | ;;
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| 89 |
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| 90 | *)
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| 91 | echo "Usage: $0 {start|stop|restart}"
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| 92 | exit 1
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| 93 | ;;
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| 94 |
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| 95 | esac
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| 96 |
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| 97 | # End $rc_base/init.d/alsa
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| 98 | <userinput>EOF
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| 99 | chmod 755 /etc/rc.d/init.d/alsa</userinput></screen></para>
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| 100 |
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| 101 | <para>You can then create the appropriate symlinks:
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| 102 | <screen><userinput>cd /etc/rc.d/init.d &&
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| 103 | ln -sf ../init.d/alsa ../rc0.d/K35alsa &&
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| 104 | ln -sf ../init.d/alsa ../rc1.d/K35alsa &&
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| 105 | ln -sf ../init.d/alsa ../rc2.d/S40alsa &&
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| 106 | ln -sf ../init.d/alsa ../rc3.d/S40alsa &&
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| 107 | ln -sf ../init.d/alsa ../rc4.d/S40alsa &&
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| 108 | ln -sf ../init.d/alsa ../rc5.d/S40alsa &&
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| 109 | ln -sf ../init.d/alsa ../rc6.d/K35alsa</userinput></screen></para>
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| 110 |
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| 111 | <para>Note that all channels of your soundcard are muted by default. You can
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| 112 | use the <filename>alsamixer</filename> program from alsa-utils (or any other
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| 113 | OSS mixer) to change this.</para>
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| 114 |
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| 115 | <para>Also, the first time the above script is run, it will complain that
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| 116 | there is no state in <filename>/etc/asound.state</filename>. You can
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| 117 | prevent this by running the following commands after installing alsa-utils:
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| 118 | <screen><userinput>touch /etc/asound.state &&
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| 119 | alsactl store</userinput></screen></para>
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| 120 |
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| 121 | <para>A final note is that the lines loading <filename>sfxload</filename>
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| 122 | are commented out. They are there as an example of other things you may
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| 123 | wish to do in the startup script. <filename>sfxload</filename> is a
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| 124 | seperate package of interest to SoundBlaster AWE and Live! users. It is
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| 125 | designed for loading "sound-fonts" (which are used for MIDI output). You
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| 126 | may wish to delete these lines and add your own or, if you have the relevant
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| 127 | soundcard, install <filename>sfxload</filename> and uncomment them.</para>
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| 128 |
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| 129 | </sect3>
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| 130 |
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| 131 | </sect2>
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| 132 |
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