thanks for your answer!
actually, i just realized that it's working now. unfortunately i don't know what of all the things i've been trying made the difference... $ cat /proc/asound/cards 0 [M2496 ]: ICE1712 - M Audio Audiophile 24/96 M Audio Audiophile 24/96 at 0xec00, irq 16 1 [CODEC ]: USB-Audio - USB Audio CODEC Burr-Brown from TI USB Audio CODEC at usb-0000:00:1a.1-2, full speed 2 [nanoKONTROL2 ]: USB-Audio - nanoKONTROL2 KORG INC. nanoKONTROL2 at usb-0000:00:1a.1-1, full speed the usb audio card is working. the midi controllers, on the other hand, although recognized by the system, are not seen by the midi sequencers i tried (rosegarden and qtractor). i'll have to investigate more, because it's the midi controllers what i'm interested in. > It means USB-1.1 as defined by AMD (I think). > > lspci | grep OHCI should show if you need it. mmm... lspci | grep OHCI gives nothing, so i guess i'll disable these modules in the kernel. thanks again, and if anyone knows how i could actually use those midi controllers, i would appreciate any help. lj