alsa - spdif -2.6.12

~L~ · Posted: Mon Jul 04, 2005 9:18 pm Post subject: alsa - spdif -2.6.12

Hi,

I have a problem that I first thought was related to udev, but after several kernel compiles later seems to be related to a kernel instead. Is there a known issue with kernel-2.6.12 and spdif passthrough with alsa (audigy).

kernel 2.6.12-r3 with devfs or udev -> only noise out of spdif
reboot
kernel 2.6.11-r10 with devfs or udev -> everything works well

Or am I missing something...

thanks,

~L~

iancognito85 · Posted: Mon Jul 04, 2005 9:30 pm Post subject:

what chipset are you using? is it an NFORCE?

cheers

~L~ · Posted: Tue Jul 05, 2005 5:40 am Post subject:

AFAIK it is emu10k2 - soundblaster audigy gamer

~L~ · Posted: Tue Jul 05, 2005 10:53 am Post subject:

And one thing that I forgot.
Playing e.g. mp3:s through spdif works, it's just the ac3 streams that give only noise

iancognito85 · Posted: Tue Jul 05, 2005 11:25 am Post subject:

hmm well from what you are describing it sounds like its having trouble decoding the 5.1 sound stream... i don't have one of these cards, I've got an nforce which are bastards to get going on SPDIF properly.

You should probably look on bugzilla to see if there is a known issue.. (sorry im using links atm so its hard to actually read what you put in your first post).

other than that... i have no ideas. sorry

cheers

offie

Cintra · Advocate Joined: 03 Apr 2004 Posts: 2111 Location: Norway

sven · Apprentice Joined: 19 Apr 2002 Posts: 274

I just upgraded to 2.6.12 and now have exactly the same problem! I own a SoundBlaster Audigy Player (emu10k1) which is connected to a surround sound decoder via coaxial digital out. I've set Xine audio output to "Pass thru" so that it should send the undecoded AC3 signal to the decoder. That worked fine before 2.6.12! Other sounds (KDE, XMMS) still work.

I am pretty sure this is not related to a missing AC3 codec because nothing is being decoded on my machine, just passed thru.

Help, something seems to be f***ked up with ALSA in 2.6.12 and AC3 passthru

~L~ · Posted: Fri Jul 08, 2005 6:44 pm Post subject:

I've been busy and thus used only 2.6.11. Anyways,

Marquel · n00b Joined: 01 May 2004 Posts: 4

I'm quite sure, it's a kernel problem, since my Audigy (Emu10k1) also had a problem after upgrading gentoo-sources to 2.6.12-r4.

I've updated manually to alsa-driver-1.0.9 and the Audigy was back working, though my problem was, that it didn't mix analog input on Line-In (external) and Aux (internal).

I've downdated to gentoo-sources-2.6.11-r11 and removed alsa-driver and it was also working. It just didn't with the kernel's alsa-driver in gentoo-sources-2.6.12-r4.

Maybe just a symptom, but with the non-working alsa-driver all the mute-switches in alsamixer and gnome-alsa-mixer were gone.

TuxFriend · Apprentice Joined: 14 Aug 2002 Posts: 151

Same over here 2.6.12 breaks AC3 passthrough, 2.6.11 works fine, also using an Audigy.

TuxFriend · Apprentice Joined: 14 Aug 2002 Posts: 151

This is a known problem and is already fixed in alsa cvs and 2.6.13-rc1, I'm not sure if it will be backported to a 2.6.12.x release.