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iBook sound: snd_powermac: No such device
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servobf
Apprentice
Apprentice


Joined: 03 Jun 2004
Posts: 160

PostPosted: Sun Jul 11, 2004 1:12 am    Post subject: iBook sound: snd_powermac: No such device Reply with quote

I had sound woking just great with the pegasos-2.6.4 kernel, but upgraded recently to the pegaso2.6.7 r1.
Alsa is set to load automatically at start-up and doesn't give any errors. Sound DOES play, but VERY VERY quitely. If the room is quiet, and I put my head near the speakers, I can hear it.
I used to modprobe snd-usb-audio and snd-powermac and it'd all be fine and dandy. snd-usb-audio still will load, but snd-powermac gives me this:
Code:
FATAL: Error inserting snd_powermac (/lib/modules/2.6.7-pegasos-r1/kernel/sound/ppc/snd-powermac.ko): No such device

What to I need to select in my kernel to get sound to work? Thanks!

~Michael
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bcnga
n00b
n00b


Joined: 08 Jul 2004
Posts: 3

PostPosted: Mon Jul 12, 2004 2:45 pm    Post subject: Reply with quote

Had similar problems, I'm no expert and do not know what type of ibook you're using but what worked for me (ibook g4) was this:

Sound-->
Advanced Linux Sound Architecture-->
<*> Advanced Linux Sound Architecture
Alsa PowerMac Devices-->
<*>PowerMac (blahblah)

I'm using 2.6.7-gentoo-r2 and as you see I don't load sound as modules but built it in. I spent a lot of time browsing forums only to find out that at some point I had enabled Powermac DMA sound support, this does *not* go well with the options mentioned above. You might also consider enabling OSS emulation, some people on this forum seem to have had to do so to avoid distorted sound.

hope you get this thing to work...
ga
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ruben
Guru
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Joined: 04 Jul 2003
Posts: 462

PostPosted: Tue Jul 13, 2004 3:30 pm    Post subject: Reply with quote

Hmm... just wanna say that you should disable Powermac DMA sound support if you use ALSA. Powermac DMA sound support is the OSS sound driver.

Normally, you only need the things as mentioned in this thread. At least that works for me.
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Red Sparrow
Tux's lil' helper
Tux's lil' helper


Joined: 05 Feb 2004
Posts: 128
Location: Greeley, CO

PostPosted: Tue Jul 20, 2004 3:52 am    Post subject: Reply with quote

In addition, increasing the setting for DRC Range helped increase the playback volume on my TiBook with the cruddy built-in speakers. I wish I could explain that one, but give it a try. Can't really hurt anything.

(- Steve -)
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BennyP
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Joined: 09 May 2003
Posts: 497
Location: Toronto, Canada

PostPosted: Tue Jul 20, 2004 7:07 pm    Post subject: Reply with quote

I'w curious, would disabling DMA have an adverse effect on performance? I dont have an iBook, but am planning to get one
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ruben
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Joined: 04 Jul 2003
Posts: 462

PostPosted: Tue Jul 20, 2004 7:42 pm    Post subject: Reply with quote

hmm... as far as i know... "Powermac DMA Sound Support" has nothing to do with DMA.... as far as i know this is just the OSS sound driver, but i have no idea why it's called "DMA Sound Support".

If you look at the 2.6 kernel source, you'll see that there's a directory:
/usr/src/linux/sound/oss/dmasound
This contains drivers for: Atari, Powermac, Amiga and Q40. OSS drivers.
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killfire
l33t
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Joined: 04 Oct 2003
Posts: 618

PostPosted: Tue Jul 20, 2004 9:15 pm    Post subject: Reply with quote

i had a problem very similar to this, running 2.6.7 on an ibook (no pegasos sources, but that shouldnt matter) an what finally worked, was enableing the alsa sound support, but making everythin g else as modules (no idea why it worked, but it did)....

i wanted to have it as modules, as without i had problems concerning a lack of /dev/dsp or /dev/snd/dsp....


my advice, is keep trying different combos of modules/built in until it works, and the BACK UP YOUR CONFIG :)

killfire
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