Good afternoon. I'm having bandwidth problems with a ID 0d8c:0102 C-Media Electronics, Inc. CM106 Like Sound Device. (Encore Electronics ENMAB-8CM, External USB 7.1 sound card) When I try to start jackd in duplex mode I get the following error in syslog: ALSA sound/usb/endpoint.c:872 cannot submit urb 0, error -28: not enough bandwidth This seems similar to an old bug that was fixed but another user has reported a regression. https://bugzilla.redhat.com/show_bug.cgi?id=527813 When starting jackd in either capture or playback mode I don't get this error so it might be related to http://marc.info/?l=linux-usb&m=131973404328622 I'm running kernel 3.6.3-1.fc17.x86_64 on a Thinkpad T410 USB info: [root@bacon ~]# lsusb Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 147e:2016 Upek Biometric Touchchip/Touchstrip Fingerprint Sensor Bus 001 Device 004: ID 17ef:480f Lenovo Integrated Webcam [R5U877] Bus 002 Device 006: ID 0d8c:0102 C-Media Electronics, Inc. CM106 Like Sound Device Bus 002 Device 004: ID 17ef:1003 Lenovo Integrated Smart Card Reader [root@bacon ~]# lsusb -t /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/3p, 480M |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/8p, 480M |__ Port 1: Dev 6, If 0, Class=audio, Driver=snd-usb-audio, 12M |__ Port 1: Dev 6, If 1, Class=audio, Driver=snd-usb-audio, 12M |__ Port 1: Dev 6, If 2, Class=audio, Driver=snd-usb-audio, 12M |__ Port 1: Dev 6, If 3, Class=HID, Driver=usbhid, 12M |__ Port 5: Dev 4, If 0, Class=scard, Driver=usbfs, 12M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/3p, 480M |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M |__ Port 3: Dev 3, If 0, Class=vend., Driver=, 12M |__ Port 6: Dev 4, If 0, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M |__ Port 6: Dev 4, If 1, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M Any ideas what needs to be done to resolve this? Please ask for any additional info you might need, I'm very eager to have this resolved. Best regards Sigurdur Bjornsson -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
