I have had an Acer Revo box as a media centre for a while. I recently installed Ubuntu Server (10.10) on it and polished it up with
nodm (one of the most simple ways to launch an X session) and installed
boxee. It's been working fine for over a month.
It's just running ALSA. I've had problems with PulseAudio/Boxee/HDMI before so I wanted to keep it simple. And that worked. It pushed both PCM and digital (AAC and various Dolby codecs) over HDMI perfectly.
But I restarted it the other day after mucking around with some
nfs configuration and now there isn't any sound.
The hardware is an ION chipset. Nvidia 9400M graphics with Nvidia MCP79/7A audio.
One thing I have noticed is there doesn't appear to be any sign of a
IEC958 device. A traditional fix in the past for fresh installs has been to load
alsamixer, find the IEC device and toggle its mute but I can't. I'm certain this used to represent the HDMI output. It just doesn't seem to exist any more unless I run
sudo alsa-utils restart while
boxee is running, when I see it in an error message:
* Shutting down ALSA... [ OK ] * Setting up ALSA... * warning: 'alsactl restore' failed with error message 'alsactl: set_control:1388: Cannot write control '2:0:0:IEC958 Playback Default:0' : Operation not permitted'... ...done.
nodm (and thus boxee) aren't running, I don't see this error but
alsamixer still doesn't show the IEC channel.
aplay -l gives:
card 0: NVidia [HDA NVidia], device 0: ALC662 rev1 Analog [ALC662 rev1 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0] Subdevices: 0/1 Subdevice #0: subdevice #0
Its section in
*-multimedia description: Audio device product: MCP79 High Definition Audio vendor: nVidia Corporation physical id: 8 bus info: pci@0000:00:08.0 version: b1 width: 32 bits clock: 66MHz capabilities: pm bus_master cap_list configuration: driver=HDA Intel latency=0 maxlatency=5 mingnt=2 resources: irq:22 memory:fae78000-fae7bfff
I was running on the stock PAE kernel but now it's running on 18.104.22.168. I upgraded to see if that fixed things; it didn't.
I'm considering a reinstall but I hate doing that because a) there's a bit of custom configuration in getting X and Boxee to start on boot and b) I don't know what the problem is. If I reinstall this time, I'll end up doing that every time the sound breaks. I love Ubuntu but I don't want to install it once a month.
Is there any way to forcibly reset all
alsa settings and restart from scratch (without doing a reinstall)? Any other tips?
If you need more information, just ask.
Debug information: http://www.alsa-project.org/db/?f=e615af490271aa6c67cfdba23d14c757012aecd9