Hello, I've bought a (el cheapo) midi-usb cable so I can play my musical keyboard (also el cheapo... but I'm no professional :)). The thing is that when I try to use it in my laptop (Gigabyte W566U, ArchLinux 64 bits, up to date), it is not reliable. I play the keys and the midi events are not delivered correctly. I'm using aseqdump to debug. For example, I press 5 keys and see 5 key down events, but when I releas them, only 2 o 3 note up events are shown. And if I play too many notes, it just stops receiving any events from the device, dmesg show a strange message "urb status -75" and reconnects the usb device. I've googled about that, but couldn't find anything usefull. I tested the same cable on my old desktop (Asus A7N8X-X motherboard, nvidia MX440 graphics card, 5 years of intensive e loyal use, ArchLinux 32 bits) and it works fine. The difference between the two seems to be the usb module that handles the device. On the laptop, it is uhci_hcd, while on the desktop it is ohci_hcd who is loaded. I've tried by all means I know to use ohci_hcd in the laptop too but I've failed. Some things I remember to have tried: 1 - force the load order in the 3 possible ways in Arch (rc.conf, mkinitcpio.conf and modprobe.conf, doesn't affect anything) 3 - disable uhci_hcd from loading (stops recognizing anything usb related) 4 - using a rt enabled kernel (doesn't affect anything, in fact my desktop is old and the cable works with the default Arch kernel, which is using CONFIG_NO_HZ=y) Does anyone has any suggestions on how can I force ohci_hcd to be loaded before uhci_hcd? Or is it realy the problem? I'm open to any suggestions. -- ------------------------------------------- Denis A. Altoe Falqueto ------------------------------------------- George Carlin - "Electricity is really just organized lightning." - http://www.brainyquote.com/quotes/authors/g/george_carlin.html _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
