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No audio on PowerBook G4 for kernels > 2.6.22



Hello,
I own a PowerBook G4.  For previous kernels (2.6.19 self compiled,
Debian 2.6.22) playing audio files was no problem.  When using the
Debian 2.6.25 or a self compiled 2.6.24 I no longer have audio
though.  When I look at the loaded modules I see that in 2.6.24
snd_seq, snd_seq_device, snd_seq_midi_event and snd_seq_oss are
loaded additionally (full diff see below).  When stracing e.g. 
mpg123 in 2.6.22, lots of files in /dev/snd are opened.  In 2.6.24 I
get several error messages for mpg123, starting with:
/dev/dsp: No such file or directory
The directory /dev/snd only contains two files: controlC0  timer

When booting into 2.6.25 (Debian), no directory /dev/snd is present 
(only /dev/sndstad) and mpg123 fails again with
/dev/dsp: No such file or directory

Compared to 2.6.22, snd_aoa, snd_aoa_codec_onyx,
snd_aoa_fabric_layout, snd_aoa_i2sbus and snd_aoa_soundbus are not
loaded in 2.6.25.  When loading snd_aoa, I see:
Setting up ALSA..warning: 'alsactl restore' failed with error message 'alsactl: laod_state:1573 No soundcards found...'...done

Trying to load snd_powermac directs me (expected) to snd_aoa.

I'm glad for any pointers to get sound back.

Machine info:
=============
machine         : PowerBook5,8
motherboard     : PowerBook5,8 MacRISC3 Power Macintosh
detected as     : 287 (PowerBook G4 15")

Differences in loaded modules:
==============================
--- /tmp/22modules	2008-07-29 21:27:23.000000000 +0200
+++ /tmp/24modules	2008-07-29 21:27:31.000000000 +0200
@@ -1,47 +1,27 @@
 Module
-aes
 agpgart
 appletouch
-bcm43xx
-blkcipher
 cbc
 cdrom
-crc_itu_t
 dm_crypt
-dm_mirror
 dm_mod
-dm_snapshot
 ehci_hcd
+eth1394
 evdev
-ext2
-ext3
 ff_memless
-firewire_core
-firewire_ohci
-firewire_sbp2
-firmware_class
-hid
-i2c_powermac
 ide_cd
-ide_disk
-ieee80211
-ieee80211_crypt
-ieee80211softmac
+ieee1394
 ip_tables
 iptable_filter
 ipv6
-jbd
 joydev
 loop
-mbcache
 nf_conntrack
 nf_conntrack_ipv4
-nfnetlink
+ohci1394
 pcmcia
 pcmcia_core
 rsrc_nonstatic
-scsi_mod
-sha256
 snd
 snd_aoa
 snd_aoa_codec_onyx
@@ -52,11 +32,14 @@
 snd_page_alloc
 snd_pcm
 snd_pcm_oss
+snd_seq
+snd_seq_device
+snd_seq_midi_event
+snd_seq_oss
 snd_timer
 soundcore
 sungem
 sungem_phy
-tsdev
 uninorth_agp
 usbhid
 x_tables
-- 
      Dr. Helge Kreutzmann                     debian@helgefjell.de
           Dipl.-Phys.                   http://www.helgefjell.de/debian.php
        64bit GNU powered                     gpg signed mail preferred
           Help keep free software "libre": http://www.ffii.de/

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