iMac 8,1 (aluminum late 2007) needs snd-hda-intel model=mbp3 quirk

[John Dong]

Out of the box in Intrepid, my iMac 8,1 has no sound -- sound devices are detected but setting all the sliders to max has no effect. dmesg shows
Oct 26 22:36:21 droptop kernel: [ 9.742947] hda_codec: Unknown model for ALC883, trying auto-probe from BIOS...

After a bit of trial and error, i found that snd-hda-intel options "model=mbp3 position_fix=2" fixes this situation -- the latter is also necessary. No position fix leads to scratchy sound and an awkward mixer volume scale (anything below 75% is basically muted), position_fix=1 results in choppy sound and dmesg errors suggesting to increase position_fix.

It would be nice if these can be quirked automagically.

Please let me know if there's any other information that would be helpful to include, other than lspci.

[Leann Ogasawara (leannogasawara)]

Hi John,

Just curious if the following patch helps or not. Care to test? Thanks.

[John Dong (jdong)]

Sure, let me give that a shot later tonight!

[Leann Ogasawara (leannogasawara)]

I noticed the status of this bug was flipped back to Confirmed but the person left no comment. However, I see that Luke has sent this patch upstream and it's already been accepted. For now I'm marking this as a duplicate of bug 332456 which Luke is monitoring. Thanks.

ogasawara@emiko:~/linux-2.6$ git log -p
2d4663816064fabb68935f920bbd7ccdc7f9392d
commit 2d4663816064fabb68935f920bbd7ccdc7f9392d
Author: Luke Yelavich <email address hidden>
Date: Mon Feb 23 13:00:33 2009 +1100

    ALSA: hda - add another MacBook Pro 3,1 SSID

    Reference: Ubuntu bug #33245
        https://bugs.launchpad.net/bugs/332456

    Signed-off-by: Luke Yelavich <email address hidden>
    Signed-off-by: Takashi Iwai <email address hidden>