On Fri, 11 Jun 2004 23:42:52 +0200 John van Spaandonk <j.spaandonk@chello.nl> wrote: > On Friday 11 June 2004 22:06, Chris Metzler wrote: >> >> Your problem is that you are loading OSS modules. The ALSA modules >> can't load if the OSS modules are installed. First, remove the OSS >> modules from your /etc/modules file, so they'll stop being loaded >> automatically during boot. Then, check to see if you have either >> discover or hotplug installed. During boot, their scripts run before >> the ALSA script does, and they'll try to install OSS modules. If >> you have either or both of them installed, make sure that the OSS >> modules are blacklisted in their respective configuration files. >> The ALSA modules will load appropriately. > > Chris, thanks for this tip. > It seems a very reasonable hypothesis. > > One question: how do I recognise OSS modules? > Did you see any in my lsmod output? Yes. From your lsmod output: }Module Size Used by Not tainted [ snip ] } mpu401 21092 0 (unused) OSS module to handle the external MIDI port. } emu10k1 64780 2 OSS module to handle the audio controller on your soundcard. } sound 61984 0 [mpu401 emu10k1] Top-level OSS module. } soundcore 4420 7 [emu10k1 sound] Module that provides sound capabilities to the kernel. You need this one regardless of whether you're using OSS or ALSA. } ac97_codec 13784 0 [emu10k1] OSS module to handle the AC97 codec (mixer, DAC/ADC, etc.) on your soundcard. ALSA modules have "snd_" at the beginning. Someone who has a Soundblaster Live will have sound modules that look like this (sorted): } snd 33796 0 [snd-seq-midi snd-emux-synth snd-seq-virmidi snd-seq-oss snd-seq-midi-event snd-seq snd-pcm-oss snd-mixer-oss snd-emu10k1 snd-pcm snd-timer snd-hwdep snd-util-mem snd-ac97-codec snd-rawmidi snd-seq-device] } snd-ac97-codec 48300 0 [snd-emu10k1] } snd-emu10k1 75332 1 [snd-emu10k1-synth] } snd-emu10k1-synth 4860 0 (autoclean) (unused) } snd-emux-synth 28348 0 (autoclean) [snd-emu10k1-synth] } snd-hwdep 5248 0 [snd-emu10k1] } snd-mixer-oss 13104 1 [snd-pcm-oss] } snd-page-alloc 6228 0 [snd-emu10k1 snd-pcm] } snd-pcm 61892 0 [snd-pcm-oss snd-emu10k1] } snd-pcm-oss 37956 0 } snd-rawmidi 14240 0 [snd-seq-midi snd-seq-virmidi snd-emu10k1] } snd-seq 38448 2 [snd-seq-midi snd-emux-synth snd-seq-midi-emul snd-seq-virmidi snd-seq-oss snd-seq-midi-event] } snd-seq-device 4256 0 [snd-seq-midi snd-emu10k1-synth snd-emux-synth snd-seq-oss snd-seq snd-emu10k1 snd-rawmidi] } snd-seq-midi 4000 0 (autoclean) (unused) } snd-seq-midi-emul 4944 0 (autoclean) [snd-emux-synth] } snd-seq-midi-event 3584 0 [snd-seq-midi snd-seq-virmidi snd-seq-oss] } snd-seq-oss 29632 0 (unused) } snd-seq-virmidi 3320 0 (autoclean) [snd-emux-synth] } snd-timer 15588 0 [snd-seq snd-pcm] } snd-util-mem 1280 0 [snd-emux-synth snd-emu10k1] (I compile soundcore into my kernel rather than use it as a module, which is why it's not listed here as well). > BTW I had installed discover just tonight, to see if it would help; > obviously I'm better of without it if I want to use ALSA. Well, I have it installed; you just need to configure it to not load the OSS modules, which is very straightforward. Look at the man pages for discover, discover-modprobe, and discover-modprobe.conf. > I also use hotplug, which gives me lots of error messages but seems > to work with USB anyway. It says PCI events are not synthesised, so I > guess I do not really have to worry about hotplug for the sound card? I dunno. I don't really understand hotplug myself. I've just heard other people here (typically, people with 2.6 kernels) talk about having to make sure hotplug didn't load OSS modules. > On a related note, isn't it time for the discover program to start > installing ALSA over OSS? Or does Debian use ALSA as a default only for > the 2.6 kernel? It's not Debian, but rather the kernel folks, who indicated that OSS was the default sound infrastructure up through the 2.4 kernels, and ALSA starting with 2.6. But I agree that discover either ought to favor the ALSA modules if they're present too, or should ask about it in its initial configuration (and maybe that's something that could be implemented through debconf, dunno). -c -- Chris Metzler cmetzler@speakeasy.snip-me.net (remove "snip-me." to email) "As a child I understood how to give; I have forgotten this grace since I have become civilized." - Chief Luther Standing Bear
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