Hi everyone, sorry for bothering. My system kernel is 2.6.29 and using ALSA 1.0.19. I am using an m-audio 2496 sound card(ICE1712) and it works fine under ALSA except for one issue: It seems that I met problems with PCM very often. For example when I tryed to run virtualbox with "ALSA Audio Driver" as its "Host Audio Driver", I got no sound in the guest OS. I read the log of VirtualBox and found: 00:00:00.837 Audio: Trying driver 'alsa'. 00:00:00.837 Audio: set_record_source ars=0 als=0 (not implemented) 00:00:00.848 ALSA: Failed to apply audio parameters 00:00:00.863 ALSA: Failed to apply audio parameters 00:00:00.878 ALSA: Failed to apply audio parameters 00:00:00.893 ALSA: Failed to apply audio parameters 00:00:00.908 ALSA: Failed to apply audio parameters 00:00:00.923 ALSA: Failed to apply audio parameters 00:00:00.929 AC97: WARNING: Unable to open PCM IN! 00:00:00.929 AC97: WARNING: Unable to open PCM MC! 00:00:00.929 AC97: WARNING: Unable to open PCM OUT! 00:00:00.929 Audio: Using NULL audio driver And similarly when I was trying to run gmplayer I got repeating warning message [AO_ALSA] Unable to find simple control 'PCM',0. I tried amixer | grep -B1 pvolume and got Simple mixer control 'Multi',0 Capabilities: pvolume pswitch -- Simple mixer control 'Multi',1 Capabilities: pvolume pswitch .... I am not familiar with PCM and in fact I even do not know what it exactly is. But I guess my card is not using PCM but Multi as some kind of controller. I just do not know what I am supposed to do with these issues. I found many suggested configuration in .asoundrc from wiki-alsa. But none of them works for me. For gmplayer I can require it to use Multi,0 as mixer channel but I do no know what I should do with virtualbox..... I wish someone can help me with this issue :) Thank you very much. Peng ------------------------------------------------------------------------------ Register Now & Save for Velocity, the Web Performance & Operations Conference from O'Reilly Media. Velocity features a full day of expert-led, hands-on workshops and two days of sessions from industry leaders in dedicated Performance & Operations tracks. Use code vel09scf and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
