Hello,

	I found that on my old iMac G3 aumix behaves weird on newer (up to
2.6.27-rc8) kernels. The sound is only present _when_ muted and is quiet
I'd say 10% of 'normal' max level. If you turn the volume up - the box is silent.
If you unmute - the box is silent. 100% reproducible.

Bisection result is a bit surprising as it seems it was introduced some time ago,
in 2.6.25 ~ 2.6.26-rc1 window:

commit a8c2a6bf464d983c642c8b8b001a57aabbf76673
Author: Risto Suominen <Risto.Suominen@gmail.com>
Date:   Thu Apr 17 17:55:30 2008 +0200

    [ALSA] snd-powermac: AWACS and Screamer mixers for PM7500, Beige, and iMac SL
    
    Add mixer controls and correct headphone detection bits for PowerMacs
    7300/7500 (AWACS) and G3 Beige (Screamer), and iMac G3 Slot-loading
    (Screamer).


	Mariusz



processor       : 0
cpu             : 740/750
temperature     : 52 C (uncalibrated)
clock           : 400.000000MHz
revision        : 2.2 (pvr 0008 0202)
bogomips        : 49.79
timebase        : 24967326
platform        : PowerMac
model           : PowerMac2,1
machine         : PowerMac2,1
motherboard     : PowerMac2,1 MacRISC2 MacRISC Power Macintosh
detected as     : 66 (iMac FireWire)
pmac flags      : 00000014
L2 cache        : 512K unified
pmac-generation : NewWorld

0000:00:0b.0 Host bridge: Apple Computer Inc. UniNorth AGP
0000:00:10.0 Display controller: ATI Technologies Inc Rage 128 RL/VR AGP
0001:10:0b.0 Host bridge: Apple Computer Inc. UniNorth PCI
0001:10:12.0 FireWire (IEEE 1394): Texas Instruments TSB12LV23 IEEE-1394 Controller
0001:10:13.0 Ethernet controller: Digital Equipment Corporation DECchip 21142/43 (rev 41)
0001:10:17.0 Class ff00: Apple Computer Inc. KeyLargo Mac I/O (rev 02)
0001:10:18.0 USB Controller: Apple Computer Inc. KeyLargo USB
0001:10:19.0 USB Controller: Apple Computer Inc. KeyLargo USB
0002:20:0b.0 Host bridge: Apple Computer Inc. UniNorth Internal PCI

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Mariusz, thank you for the report. This is my fault. Sorry.

PowerMac2,1 seems to have the mute bit reversed compared to later
models, PowerMac2,2 and PowerMac4,1, which I was using for testing my
changes.

This has been fixed in a later patch that should be included in kernel
2.6.27, I believe.

Takashi, when was this (or will be) included? I sent two patches on 2008-08-25.

Risto
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At Wed, 1 Oct 2008 23:47:34 +0300,

No, it wasn't because it's not clear whether the patches are
regression fixes.

Mariusz, try sound git tree.  Risto's patches are already there.
    git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git
    
If it works, then try to cherry-pick the following two commits onto
the vanilla kernel:
- 8352a6fe67a0f804302b93178f2e13b66004a693
      ALSA: snd-powermac: mixers for PowerMac G4 AGP
- e25ae4fd3ccba79cfd5628642754a145394225f6
      ALSA: snd-powermac: HP detection for 1st iMac G3 SL

thanks,

Takashi
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sound-2.6 works ok.
linux-2.6 plus the two patches above solve the sound problem for me.


BTW git-cherry-pick is a cool thing :)

Thanks,

	Mariusz
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At Thu, 2 Oct 2008 12:39:20 +0200,

Thanks for checking.  I'll add them to the next pull request.


Takashi
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