linux-kernel - regression on imac G3: problems with sound

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Message-Id: <200810011755.11536.m.kozlowski@tuxland.pl>
Date:	Wed, 1 Oct 2008 17:55:10 +0200
From:	Mariusz Kozlowski <m.kozlowski@...land.pl>
To:	Risto Suominen <Risto.Suominen@...il.com>,
	Takashi Iwai <tiwai@...e.de>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	kernel-testers@...r.kernel.org, linuxppc-dev@...abs.org,
	paulus@...ba.org, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: regression on imac G3: problems with sound

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@...il.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

View attachment ".config" of type "text/plain" (35752 bytes)