Thomas wrote: ================= Hi Giovanni, thankx for you replay. I using ubuntu lucid. The alsa-driver make a problem. Alsa is compiled correcly from sources. when i execute the following command: root@freeswitch:/# modprobe snd_dummy WARNING: Error inserting snd_page_alloc (/lib/modules/2.6.32-27-generic-pae/kern el/sound/acore/snd-page-alloc.ko): Unknown symbol in module, or unknown paramete r (see dmesg) WARNING: Error inserting snd_timer (/lib/modules/2.6.32-27-generic-pae/kernel/so und/acore/snd-timer.ko): Unknown symbol in module, or unknown parameter (see dme sg) WARNING: Error inserting snd_pcm (/lib/modules/2.6.32-27-generic-pae/kernel/soun d/acore/snd-pcm.ko): Unknown symbol in module, or unknown parameter (see dmesg) FATAL: Error inserting snd_dummy (/lib/modules/2.6.32-27-generic-pae/kernel/soun d/drivers/snd-dummy.ko): Unknown symbol in module, or unknown parameter (see dme sg) i make: depmod -a i reboot the system, the problem is the same. can you looking please? tahkx. ===================== My answer: have you followed strictly the guidelines in the wiki page for compiling and loading the custom snd-dummy? (alsa and drivers are tricky beasts) can you paste here the results in dmesg (/var/log/messages) that are related to that? anyway, seems that you have one of this problems: a) maybe you have not done "make" then (after make) "make install" b) maybe you still have the old sound directory in your /var/lib/modules tree c) maybe you have compiled and installed the alsa mods for a previous kernel version can you report exactly what you have done (and answer the previous questions) ? -giovanni -- Sincerely, Giovanni Maruzzelli Cell : +39-347-2665618