9.04 suddenly no sound

[freakyjohn101]

i have a xubuntu 9.04 system that working nicely, but yesterday suddenly my xubuntu has no sound. when i try gstreamer-properties and press the 'test' button my soundcard output a sound which indicate that the soundcard is ok, but all my sound application such as vlc, movie player, firefox using youtube doesn't output a sound. can anyone help me figuring out what's wrong with my system?

[freakyjohn101]

testing soundcard with aplay didn't output any sound...

$ aplay -vv ./911.wav 
Playing WAVE './911.wav' : Unsigned 8 bit, Rate 11025 Hz, Mono
ALSA <-> PulseAudio PCM I/O Plugin
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : U8
  subformat    : STD
  channels     : 1
  rate         : 11025
  exact rate   : 11025 (11025/1)
  msbits       : 8
  buffer_size  : 5513
  period_size  : 1378
  period_time  : 125000
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 1378
  period_event : 0
  start_threshold  : 5513
  stop_threshold   : 5513
  silence_threshold: 0
  silence_size : 0
  boundary     : 1445199872
#                              +                   | 60%

so the sound is only available on gstreamer-properties...
and if i open vlc or other sound apps.. gstreamer-properties can't use the device because it was used by other apps

[freakyjohn101]

i found the problem but i don't know how to fix it coz im noob.
in /var/lib/alsa/asound.state i tried changing

	control.30 {
		comment.access 'read write'
		comment.type BOOLEAN
		comment.count 1
		iface MIXER
		name 'IEC958 Output Switch'
		value true
	}

to

	control.30 {
		comment.access 'read write'
		comment.type BOOLEAN
		comment.count 1
		iface MIXER
		name 'IEC958 Output Switch'
		value false
	}

then in shell i do

$alsactl restore

now the soundcard outputing sound. but if i reboot the system, the soundcard not working again. i have to write $alsactl restore again to make the sound working... it looks like some program change this setting at startup but i don't know which program... can anyone help me?

[SPARTAN-118]

You're not a "noob" - everybody has to start somewhere!

Open the Xfce 4 Settings Manager and go to Session and Startup. Then, go to Application Autostart and click "Add". Do what you want for "name" and "description", but for command type in "alsactl restore". That should start up your system, making sure ALSA always restores to the settings you used to get it to work.

Notice I said "should". Tell me if it works, and we'll go from there.

Matt.