You may look for settings like "playback buffer" or "buffer size". One option you might try is running jackd with a buffer size of 512 or 1024, and using an .asoundrc file in your home directory to create a jackd PCM and set it as the default PCM. Mike Bourgeous On 4/8/07, Jason Heeris <heerij01@xxxxxxxxxxxxxxxxxx> wrote: > System: NEC Versa M540 laptop > Dist: Debian Sarge/Etch > Kernel: 2.6.18 > Alsa: using drivers in kernel, although no difference when compiled from > alsa-source package. > Card in question: C-Media USB sound card (more info below) > > I recently purchased a C-Media USB sound card, and eventually figured > out that it only works with a fragment size of 2048 or less. I can use > alsaplayer with the '-f' option to hear sound through them, but I want > to tell ALSA in general that it can only handle this range for the > fragment size (and only for this card). Hopefully then I'll be able to > hear all my other applications. > > I'm not even sure where to start -- udev, ALSA configuration, module > configuration... > > I've read every resource on ALSA configuration files that I can find, > and tried a whole lot of plugin definitions and parameters with no luck > whatsoever. I also tried forcing the index of the card by adding the > following to /etc/modprobe.d/alsa-base, but even this only works half of > the time: > > -- > # Prevent abnormal drivers from grabbing index 0 > options snd-bt87x index=-2 > options snd-cx88_alsa index=-2 > options snd-atiixp-modem index=-2 > # options snd-intel8x0m index=-2 > options snd-via82xx-modem index=-2 > > options snd-intel8x0 index=0 > options snd-intel8x0m index=1 > options snd-usb-audio index=2 vid=0d8c pid=000c > options snd-usb-audio index=3 > -- > > The contents of '/proc/asound/cards' are: > > -- > 0 [I82801DBICH4 ]: ICH4 - Intel 82801DB-ICH4 > Intel 82801DB-ICH4 with ALC655 at 0xf0000400, irq > 5 > 1 [Modem ]: ICH-MODEM - Intel 82801DB-ICH4 Modem > Intel 82801DB-ICH4 Modem at 0xe200, irq 5 > 2 [default ]: USB-Audio - C-Media USB Headphone Set > C-Media USB Headphone Set at usb-0000:00:1d.1-1, > full speed > -- > > ...although sometimes the ICH-MODEM is missing and the C-Media card is > at #1. > > Card information from 'lsusb': > > Bus 002 Device 003: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter > > Usually I boot with the card plugged in, but if I plug it in after > booting, the new modules loaded are: snd_hwdep, snd_rawmidi, > snd_usb_audio and snd_usb_lib. > > By the way, nowhere could I find in the documentation what the various > synonyms were for 'fragment size' -- what else is this parameter called? > What is the equivalent in ALSA configuration files? I figured it was > 'packet_bytes', but I wasn't sure. > > Anyway, I would appreciate any advice on this. > > Thanks, > Jason > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys-and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Alsa-user mailing list > Alsa-user@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/alsa-user > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
