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@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@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@heron:~$