Oliver Neukum wrote: > Am Montag, 4. Februar 2008 09:58:19 schrieb Clemens Ladisch: >> Oliver Neukum wrote: >> > this patch implements autosuspend for USB audio devices. >> >> The Creative Audigy 2 NX mutes itself when being suspended but doesn't >> unmute when resuming. (Apparently, this self-powered device treats >> supend the same as disconnection.) > > It must be added to the USB quirk list. Please provide vendor:product id. > >> The Roland SC-8820 resets itself when being resumed and loses all > > A quirk is needed, too.
/* Creative SB Audigy 2 NX */ USB_DEVICE(0x041e, 0x3020) /* Roland SC-8820 */ USB_DEVICE(0x0582, 0x0007) /* Edirol SD-20 */ USB_DEVICE(0x0582, 0x0027) I fear there are many other devices with similar problems. >> parameter settings. Furthermore, it should be possible to use this >> device with its external input even when the computer isn't accessing >> it. > > How could the device be used without the computer? Please explain. It's a MIDI synthesizer with an external MIDI input. It's possible to connect a MIDI keyboard directly and to use the computer just for power and/or for setting parameters before playing. >> The Edirol UA-1A resumes OK (but it doesn't have any internal state). > > Not even volume? Mute/unmute? No. >> Your patch doesn't touch usbmidi.c -- USB MIDI devices are suspended >> even when they're being used. > > Yes, I noticed. I thought midi is a separate driver. Is there documentation > on the midi API? Documentation/DocBook/writing-an-alsa-driver, section "RawMIDI Interface". Just use the *_open/*_close and *_disconnect callbacks. Regards, Clemens - To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
