[SOLVED] Lost Sound After Upgrade

Question

Solved (for now at least). The problem appears to be a bug with alsa. Alsaconf writes a file called /etc/modprobe.d/50-sound.conf, which contains the aliases for the sound card. But for some reason it then wasn't reading the file. Copying the alias entries to /etc/modprobe.d/modprobe.conf to read directly from there seems to have worked.
Now to fix the frequency scaling.
===================== solved ===========================
I lost all sound after the last upgrade. I just rebooted because frequency scaling is also not working, and no sound.
all drivers seem to be there:
08:50 AM:~ $ lsmod |grep snd
snd_mpu401_uart 9264 0
snd_hda_codec_realtek 278132 1
snd_cs46xx 96800 1
snd_seq_dummy 3540 0
gameport 13760 2 snd_cs46xx
snd_hda_intel 31208 3
snd_hda_codec 82128 2 snd_hda_codec_realtek,snd_hda_intel
snd_hwdep 9976 1 snd_hda_codec
snd_rawmidi 26592 2 snd_mpu401_uart,snd_cs46xx
snd_ac97_codec 133560 1 snd_cs46xx
snd_seq_oss 36224 0
snd_seq_midi_event 8592 1 snd_seq_oss
snd_seq 64640 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
snd_seq_device 8324 4 snd_seq_dummy,snd_rawmidi,snd_seq_oss,snd_seq
snd_pcm_oss 47328 0
snd_pcm 90872 5 snd_cs46xx,snd_hda_intel,snd_hda_codec,snd_ac97_codec,snd_pcm_oss
snd_timer 25344 2 snd_seq,snd_pcm
snd_page_alloc 10784 3 snd_cs46xx,snd_hda_intel,snd_pcm
snd_mixer_oss 20976 2 snd_pcm_oss
snd 76744 21 snd_mpu401_uart,snd_hda_codec_realtek,snd_cs46xx,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_rawmidi,snd_ac97_codec,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_pcm,snd_timer,snd_mixer_oss
soundcore 8576 2 snd
ac97_bus 2160 1 snd_ac97_codec
I don't see anything in the updated packages that might cause this:
[2009-08-09 18:09] upgraded gawk (3.1.6-3 -> 3.1.7-1)
[2009-08-09 18:09] upgraded gimp (2.6.6-2 -> 2.6.6-3)
[2009-08-09 18:09] upgraded imagemagick (6.5.4.5-1 -> 6.5.4.8-1)
[2009-08-09 18:09] upgraded kdelibs3 (3.5.10-5 -> 3.5.10-7)
[2009-08-09 18:09] upgraded mkinitcpio (0.5.25-1 -> 0.5.26-1)
[2009-08-09 18:09] upgraded polkit-qt (0.9.2-1 -> 0.9.2-2)
[2009-08-09 18:09] upgraded psmisc (22.7-1 -> 22.8-1)
[2009-08-09 18:09] upgraded python-pygame (1.9.0-1 -> 1.9.1-1)
[2009-08-09 18:09] upgraded python-pysqlite (2.4.1-2 -> 2.5.5-1)
[2009-08-09 18:09] upgraded readline (6.0.003-3 -> 6.0.004-1)
[2009-08-09 18:09] Fixing gshadow file ...
[2009-08-09 18:09] upgraded shadow (4.1.4.1-1 -> 4.1.4.2-1)
I tried firefox, xine, mythfrontend, avidemux2, xmms and mpg123 - there's no sound in any app. If I play something where there are indicators, like in xmms, the eq indicator levels jump, the song progresses like it's playing, but no sound. I reran alsaconf, it seems to be configured properly. The mixer sliders work and aren't muted. It doesn't work either as root or as user.
I have another computer hooked up through the line out and the sound still works fine there, so it doesn't appear to be a hardware problem.
I'm completely stumped at this point. If it's a bug somewhere, what's it a bug in to cause global sound loss? Is there anything else I'm overlooking? All I can think is that it must be muted somewhere, but I can't find it. Or else it has something to do with the cpu and cpu freq scaling that's also broken now.
===================== solved ===========================
Last edited by userlander (2009-08-10 15:04:45)

Answer 1

Try this  - Reset the iPad by holding down on the Sleep and Home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons. (This is equivalent to rebooting your computer.)
Check your settings. The iPads have a small switch on the right edge. It can be used as a rotation lock to keep the screen from automatically reorienting itself as you move around, but you need to have the tablet’s settings configured properly. That same switch, right above the volume buttons, can also be set to function instead as a mute button to silence certain types of audio.
If the switch is set to work as a mute button, you can change its purpose to “screen-rotation lock” by tapping the Settings icon on the home screen. On the Settings screen, tap General on the left side, and on the right side of the screen flick down to “Use Side Switch to.” Tap to select Lock Rotation or Mute to set the button’s function. Even if you set the side switch for your preferred use, you can still mute the Mini or lock the screen. Just double-click the Home button, and when the panel of apps appears along the bottom edge of the screen, flick the row from left to right with your finger. Tap the icon on the far left side of the row to either lock the iPad’s screen or mute the iPad’s alerts, notifications and sound effects. Music, podcasts and video are not muted unless you turn the volume all the way down.
iPhone: Can't hear through the receiver or speakers
http://support.apple.com/kb/ts1630
http://www.atreks.com/app-no-sound-on-ipad-4-%E2%80%93-what-to-do/
 Cheers, Tom