On Sun, 11 Jan 2004, David Brownell wrote: > Bill Unruh wrote: > > If I plug in a Creative Soundblaster MP3 USB soundcard into the USB bus, > > the whole system halts (no reponse from anything-- only solution is a > > hardware switchoff). > > I narrowed it down to the ehci-hcd module by bringing up all modules > > except it, and when it was brought up with the USB soundblaster plugged > > in , the freeze happened again (note without the soundblaster plugged in > > everything worked fine). > > I'll be surprised if it's actually the "plugging in" rather than > your usb audio driver binding to it. You ought to be able to turn > off hotplug temporarily (echo /bin/true > /proc/sys/kernel/hotplug), > rmmod that audio driver, and then enumerate the device. > > Is that a high speed device, or were you connecting a full speed > device through a high speed hub? The former should work with the > latest EHCI patches (rewrite of highspeed iso support). The latter > won't work yet (someone would need to write it, using the highspeed > support as a model), though it _should_ just fail gracefully.
I think it is a standard (1.1) USB device (Creative gives no technical info on their products anywhere I could find-- not in the docs in the box, or on their web page-- not even the bytes/sec the device supports.) but I am not sure. I know that I turned off the echi_hcd modules, with the other modules left running, (including the usb-audio module) and could see nothing on any of the USB lines. If I started up the echi_hcd module, I got both the light on the USB device turning on, and a freeze. Unfotunately I have now returned the device to the store, so other experiments will not work, at least not for a while. By the latest ehci patches, you mean in which version of the kernel? (2.4 series(?)). Thanks for your attention. Bill Unruh ------------------------------------------------------- This SF.net email is sponsored by: Perforce Software. Perforce is the Fast Software Configuration Management System offering advanced branching capabilities and atomic changes on 50+ platforms. Free Eval! http://www.perforce.com/perforce/loadprog.html _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
