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Thread: Ubuntu 12.04 on PPC Mac mini: Dummy Output for sound card?

  1. #1
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    Ubuntu 12.04 on PPC Mac mini: Dummy Output for sound card?

    Hello everyone,

    I hope that you can help a complete novice to enable sound output following my otherwise successful installation of Ubuntu 12.04 from an early April LiveCD build onto my 1.42 GHz PowerPC Mac mini.

    When I initially tried booting my Mac mini from the LiveCD, audio was enabled by default in System Settings where, under the Sound preference, Output was set to play through headphones by KeyLargo/Intrepid Mac I/O.

    However, after installing Ubuntu 12.04 the G4 Mac mini was mute. In the System Settings under the Sound preference, Output is now set to play through Dummy Output.

    How to I restore/add drivers to enable KeyLargo/Intrepid Mac I/O again?

    Any help or advice gratefully received.

    Sincerely,

    Ade

  2. #2
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    Re: Ubuntu 12.04 on PPC Mac mini: Dummy Output for sound card?

    Hi!
    Well, same problem here, on the very same machine, after a fresh Debian Wheezy install.
    Using the 3.2.0-1-powerpc kernel (is that the same on 12-04 ?)
    lsmod shows the modules snd, snd_powermac, snd_timer, snd_pcm, snd_page_alloc and soundcore enabled, but alsa can't find any soundcard.
    Running alsaloop gives :

    Code:
    ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
    playback hw:0,0 open error: No such file or directory
    Loopback initialization failure.
    Honestly, I'm still wondering what does the actual job of a soundcard on this machine.
    It seems to be NEC hardware, and I've heard about a AOA driver (from gentoo people).
    But I couldn't say more for now.

    I'll keep looking around, keep in touch!

  3. #3
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    Re: Ubuntu 12.04 on PPC Mac mini: Dummy Output for sound card?

    How to I restore/add drivers to enable KeyLargo/Intrepid Mac I/O again?
    Here are some useful elements of reflexion, for any purpose, but they may be outdated (in regards to the kernel version) :
    http://kmuto.jp/debian/hcl/Apple/Mac+Mini+G4

    I'm suspecting the problem could lie somewhere in /etc/modprobe.d/alsa-base.conf
    but I'll see about that tomorrow.

    Cheers

  4. #4
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    Re: Ubuntu 12.04 on PPC Mac mini: Dummy Output for sound card?

    Linux on your Apple Mac │ iLinux
    http://mac.linux.be
    http://www.mintppc.org

  5. #5
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    Re: Ubuntu 12.04 on PPC Mac mini: Dummy Output for sound card?

    Have you had a look at the FAQ https://wiki.ubuntu.com/PowerPCFAQ#W...ve_no_sound.3F ?

    Have a read of the debian bug report that is linked there. If you have the same problem can you raise a bug against the hw-detect package https://launchpad.net/ubuntu/+source/hw-detect or the debian-installer package. Thanks

  6. #6
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    Re: Ubuntu 12.04 on PPC Mac mini: Dummy Output for sound card?

    Linux on your Apple Mac │ iLinux
    http://mac.linux.be
    http://www.mintppc.org

  7. #7
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    Re: Ubuntu 12.04 on PPC Mac mini: Dummy Output for sound card?

    Fixed. Thanks.

    It was the other link I was referring to though http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650588 which should already be familiar to you!

  8. #8
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    Re: Ubuntu 12.04 on PPC Mac mini: Dummy Output for sound card?

    rsavage: do I notice some humor in your response ?
    Linux on your Apple Mac │ iLinux
    http://mac.linux.be
    http://www.mintppc.org

  9. #9
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    Re: Ubuntu 12.04 on PPC Mac mini: Dummy Output for sound card?

    Thanks, everyone, for your suggestions thus far.

    So, bearing in mind that I'm a real novice at this and following the logic (I hope) of the http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650588 discussion as a possible solution, how do I create /etc/modules and add the following kernel modules to (hopefully) make sound work:
    snd_aoa_i2sbus
    snd_aoa_fabric_layout
    snd_aoa_codec_tas
    snd_aoa_codec_onyx

    Once again, any help gratefully received. Thanks, Ade

  10. #10
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    Re: Ubuntu 12.04 on PPC Mac mini: Dummy Output for sound card?

    Code:
    sudo nano /etc/modules
    you enter a text editor
    scroll down and add the following lines:
    Code:
    snd_aoa_i2sbus
    snd_aoa_fabric_layout
    snd_aoa_codec_tas
    snd_aoa_codec_onyx
    then CTRL-X and "y" to save
    reboot
    sound works hopefully
    Linux on your Apple Mac │ iLinux
    http://mac.linux.be
    http://www.mintppc.org

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