On Friday 20 December 2002 21:09, Clemens Ladisch wrote: > Takashi Iwai wrote: > > Mark Knecht wrote: > > > I was wondering what would happen in this process if someone had two r > > > three identical USB devices, like the MidiMan 2X2? OR also two > > > identical cards like the RME HDSP 9652? > > > > when a module is loaded and two or more identical (or supported) > > devices are connected, the module will initialize the all such devices > > at once. > > > > for multiple devices, you can specify the options separated by commas, > > > > > It is important that the system recognize the same hardware as the same > > > sound device every time the machine booted, and whether the machine is > > > warm or cold booted. > > > > in the case of usb, it's not 100% sure, because it's anyway > > hotpluggable. but usually the order of probing is identical, so it's > > ok.
The probing order is the same if you plug everytime the same device at the same USB bus/port. Hotplug agent also receives an environment variable, DEVICE=/proc/bus/usb/001/002 or something like this, being the last numbers the USB bus and device numbers. > It is possible to force USB devices to a specific index with the vid/pid > parameters for the vendor/product id, even when hotplugging. > However, this won't work when you hotplug two identical devices (with the > same product id). The vid/pid parameters work well for me, as i have two USB MIDI devices from different vendors. It works regarding the plug order, or the USB port used. Perhaps another parameter like usbdev=001/002 or something else could be useful in case that someone has several identical devices? Clemens, I remember that /proc/asound/cards returned this bus/device information for USB MIDI devices some time ago (rc3?), like it does for my SB 128 PCI. Regards, Pedro -- ALSA Library Bindings for Pascal http://alsapas.alturl.com ------------------------------------------------------- This SF.NET email is sponsored by: The Best Geek Holiday Gifts! Time is running out! Thinkgeek.com has the coolest gifts for your favorite geek. Let your fingers do the typing. Visit Now. T H I N K G E E K . C O M http://www.thinkgeek.com/sf/ _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
