Hi, while I'm not a Debian user, I think I am able to point you at the potentional root of this problem. I saw following line your dmesg: Maestro3: probe of 0000:00:0d.0 failed with error -2
The cause is probably the missing firmware for your card. The firmware can be either embedded into the kernel or distributed alone, depending on the CONFIG_SND_MAESTRO3_FIRMWARE_IN_KERNEL kernel config option. See following lines from kernel's sound/pci/maestro3.c: 61 #ifndef CONFIG_SND_MAESTRO3_FIRMWARE_IN_KERNEL 62 MODULE_FIRMWARE("ess/maestro3_assp_kernel.fw"); 63 MODULE_FIRMWARE("ess/maestro3_assp_minisrc.fw"); 64 #endif So in order for this card to work, you need either package with firmware (alsa-firmware usually) or CONFIG_SND_MAESTRO3_FIRMWARE_IN_KERNEL option enabled. I guess Debian switched this option from yes to no between kernel versions. Regards, Matěj Laitl