SPDIF Optical digital out intermittent/choppy (ATI RS780 Audio)

[Ben Edwards]

I am using a Cambridge Soundworks DTT3500 connected via a optical cable.  I
am using Ubuntu 9.10.  I am getting intermittent/choppy playback.  It
normally settles down after a few minutes but is very irritating.  Below is
a full lspci and lsmod.  Any ideas?

Regards,
Ben

ben at heron:~$ lspci
00:00.0 Host bridge: Advanced Micro Devices [AMD] RS780 Host Bridge
00:01.0 PCI bridge: Micro-Star International Co., Ltd. Device 9602
00:05.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge
(PCIE port 1)
00:06.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge
(PCIE port 2)
00:11.0 SATA controller: ATI Technologies Inc SB700/SB800 SATA Controller
[IDE mode]
00:12.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0
Controller
00:12.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:12.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:13.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0
Controller
00:13.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:13.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 3a)
00:14.1 IDE interface: ATI Technologies Inc SB700/SB800 IDE Controller
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
00:14.3 ISA bridge: ATI Technologies Inc SB700/SB800 LPC host controller
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge
00:14.5 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI2
Controller
00:18.0 Host bridge: Advanced Micro Devices [AMD] K10 [Opteron, Athlon64,
Sempron] HyperTransport Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K10 [Opteron, Athlon64,
Sempron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K10 [Opteron, Athlon64,
Sempron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K10 [Opteron, Athlon64,
Sempron] Miscellaneous Control
00:18.4 Host bridge: Advanced Micro Devices [AMD] K10 [Opteron, Athlon64,
Sempron] Link Control
01:05.0 VGA compatible controller: ATI Technologies Inc Radeon HD 3200
Graphics
01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B
PCI Express Gigabit Ethernet controller (rev 02)
03:00.0 FireWire (IEEE 1394): JMicron Technology Corp. IEEE 1394 Host
Controller
04:06.0 FireWire (IEEE 1394): Texas Instruments TSB12LV26 IEEE-1394
Controller (Link)

ben at heron:~$ lsmod
Module                  Size  Used by
usb_storage            52576  1
nls_cp437               5372  0
isofs                  31620  0
udf                    80900  2
crc_itu_t               1852  1 udf
binfmt_misc             8356  1
nfsd                  241104  9
exportfs                4412  1 nfsd
nfs                   271912  1
lockd                  67724  2 nfsd,nfs
nfs_acl                 2844  2 nfsd,nfs
auth_rpcgss            36576  2 nfsd,nfs
sunrpc                191712  14 nfsd,nfs,lockd,nfs_acl,auth_rpcgss
snd_hda_codec_atihdmi     3356  1
snd_hda_codec_realtek   203328  1
iptable_filter          3100  0
snd_hda_intel          26920  0
ip_tables              11692  1 iptable_filter
snd_hda_codec          75708  3
snd_hda_codec_atihdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep               7200  1 snd_hda_codec
snd_pcm_oss            37920  0
x_tables               16544  1 ip_tables
snd_mixer_oss          16028  1 snd_pcm_oss
snd_pcm                75296  3 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_seq_dummy           2656  0
snd_seq_oss            28576  0
snd_seq_midi            6432  0
snd_rawmidi            22208  1 snd_seq_midi
snd_seq_midi_event      6940  2 snd_seq_oss,snd_seq_midi
snd_seq                50224  6
snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer              22276  2 snd_pcm,snd_seq
snd_seq_device          6920  5
snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
i2c_piix4               9932  0
snd                    59204  12
snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
fglrx                1989532  39
agpgart                34988  1 fglrx
soundcore               7264  1 snd
snd_page_alloc          9156  2 snd_hda_intel,snd_pcm
joydev                 10272  0
shpchp                 32272  0
video1394              15452  0
raw1394                25308  0
psmouse                56500  0
ppdev                   6688  0
parport_pc             31940  1
lp                      8964  0
serio_raw               5280  0
parport                35340  3 ppdev,parport_pc,lp
dm_raid45              84228  0
xor                    15620  1 dm_raid45
hid_logitech            8412  0
ff_memless              5188  1 hid_logitech
hid_belkin              2076  0
usbhid                 38208  1 hid_logitech
ohci1394               29900  1 video1394
ieee1394               86596  3 video1394,raw1394,ohci1394
r8169                  32064  0
mii                     5212  1 r8169
ben at heron:~$
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