On Sat, 3 Nov 2012, [ISO-8859-1] Sigur�Bj�son wrote: > 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 This issue has never really been fixed. There have been a couple of small improvements that have helped in some cases, but the underlying problem still remains. > 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. The bandwidth allocation might fail because of the HID interface on your audio device. If you can get along with it, unbinding that interface might help: echo 2-1.1:1.3 >/sys/bus/usb/drivers/usbhid/unbind Alan Stern -- 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
