Thanks Clemens, ------ There should by an error message in the system log (/var/log/messages, or the output of dmesg). ------ I did not find anything relevant to show me clearly about problems with PCI soundcards. Unfortunately I failed to understand well the content of these messages :( Anyway, I did the following: I removed these 3 PCI soundcards and then install them again one by one. First I installed one in slot 3 ... ok ok ok ... same irq :)) ... : cat /proc/asound/cards 0 [ICH5 ]: ICH4 - Intel ICH5 Intel ICH5 with AD1981B at irq 17 1 [ALS4000 ]: ALS4000 - Avance Logic ALS4000 Avance Logic ALS4000 at 0x2000, irq 17 Then I added other in slot 2: cat /proc/asound/cards 0 [ICH5 ]: ICH4 - Intel ICH5 Intel ICH5 with AD1981B at irq 17 1 [ALS4000 ]: ALS4000 - Avance Logic ALS4000 Avance Logic ALS4000 at 0x2000, irq 22 2 [ALS4000_1 ]: ALS4000 - Avance Logic ALS4000 Avance Logic ALS4000 at 0x2080, irq 17 Finally I added the other one in slot 1: cat /proc/asound/cards 0 [ICH5 ]: ICH4 - Intel ICH5 Intel ICH5 with AD1981B at irq 17 1 [ALS4000 ]: ALS4000 - Avance Logic ALS4000 Avance Logic ALS4000 at 0x2000, irq 21 2 [ALS4000_1 ]: ALS4000 - Avance Logic ALS4000 Avance Logic ALS4000 at 0x2080, irq 22 3 [ALS4000_2 ]: ALS4000 - Avance Logic ALS4000 Avance Logic ALS4000 at 0x2400, irq 17 Now is ok, 4 soundcards !! Then I carried out several reboots and also I returned several times to the BIOS Setup factory settings. Fortunately so far it not repeated the problem, even in some restarts 4 soundcards often change order, but they are always 4 !! Now I exchanged soundcards of slot 2 and 3. Everything is operating normally. I do not understand what has been the problem ... I installed Debian 8 with PCI soundcards installed. Should I install Debian 8 again, but now without PCI soundcards installed and install them after, one to one ?. Regards. José Luis ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. https://ad.doubleclick.net/ddm/clk/305295220;132659582;e _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user