port-macppc/40054: powerbook g4/500 titanium problem with netbsd-5: no speaker output w/ awacs

[mk%kilbi.de@localhost]

>Number:         40054
>Category:       port-macppc
>Synopsis:       powerbook g4/500 titanium with netbsd-5 kernel and awacs audio 
>can no longer produce builtin speaker output
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    port-macppc-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Nov 28 14:45:00 +0000 2008
>Originator:     Markus W Kilbinger
>Release:        NetBSD 5.0_BETA
>Organization:
>Environment:
        
        
System: NetBSD 5.0_BETA (MAC) #2: Fri Nov 28 09:24:53 MET 2008  
root@qie:/usr/u/NetBSD/netbsd-5/src/sys/arch/macppc/compile/MAC macppc
Architecture: powerpc
Machine: macppc
>Description:

        On my powerbook g4/500 titanium installed with a netbsd-4
        userland (and kernel for normal use) I tried to use an actual
        customized (mainly awacs activated and fwohci deactivated (see
        pr #40051)) netbsd-5 kernel. 'awacs'/'audio' seems to be
        detected correctly (dmesg excerpt):

          awacs0 at obio0 offset 0x14000 Screamer: irq 24,9,10
          awacs0: speaker
          audio0 at awacs0: full duplex

        , but there is no hear-able built-in speaker output.

        But there _is_ hear-able/normal audio headphone output if I
        plug in a headphone!? If I remove the headphone there is still
        no built-in speaker output.

        With the netbsd-4 kernel dmesg output looks shorter:

          awacs0 at obio0 offset 0x14000: irq 24,9,10
          audio0 at awacs0: full duplex

        , but built-inspeaker output works! To activate headphones
        output I had to manually switch it via 'mixerctl':

          mixerctl -w monitor.output=headphones

        , which seems to be done automatically with the netbsd-5
        kernel.
>How-To-Repeat:
        Boot a customized, 'awacs' and 'audio at awacs' activated,
        netbsd-5 kernel on a powerbook g4/500 titanium and try to
        produce built-in speaker output ('ogg123 test.ogg' in my
        case). Built-in speaker output does not not work for me, but
        just plugging in headphones produce normal headphones output.
>Fix:
        Unknown.

>Unformatted: