Thanks Nigel, that is the one I'm currently experimenting with. I have these installed: # rpm -qa | grep alsa alsa-lib-devel-1.0.11-4.rc2 alsamixergui-0.9.0-0.2.rc1.fc5 alsa-tools-1.0.10-2.fc5 alsa-lib-1.0.11-4.rc2 alsa-utils-1.0.11-4.rc2 Then I also downloaded/compiled and installed the newest alsa sources 1.0.12.rc1 from alsa-project.org. The modules seem to be loaded: # lsmod | grep snd snd_hda_intel 19220 0 snd_hda_codec 142592 1 snd_hda_intel snd_seq_dummy 4484 0 snd_seq_oss 34688 0 snd_seq_midi_event 7936 1 snd_seq_oss snd_seq 54224 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event snd_seq_device 9612 3 snd_seq_dummy,snd_seq_oss,snd_seq snd_pcm_oss 43168 0 snd_mixer_oss 18560 1 snd_pcm_oss snd_pcm 79364 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss snd_timer 24836 2 snd_seq,snd_pcm snd 56548 10 snd_hda_intel,snd_hda_codec,snd_seq_dummy,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer soundcore 10017 1 snd snd_page_alloc 10888 2 snd_hda_intel,snd_pcm aplay does not give an error, but I do not hear anything: # aplay `locate KDE_Startup_new` Playing WAVE '/usr/share/sounds/KDE_Startup_new.wav' : Signed 16 bit Little Endian, Rate 22050 Hz, Stereo What more can I try? # /etc/init.d/alsasound status ALSA sound driver loaded. This command hangs for ever: # /etc/init.d/alsasound stop Shutting down sound driver: After some debugging, I think it's because this one also hangs for ever: # aconnect --removeall Thanks for any suggestion, JeeBee.