From: Risto Suominen <Risto.Suominen@gmail.com>

Correct headphone detection for 1st generation iMac G3 Slot-loading (Screamer).

Signed-off-by: Risto Suominen <Risto.Suominen@gmail.com>
---
Kernel version 2.6.25-rc8 (probably any 2.6)

--- a/alsa-kernel/ppc/awacs.c.orig	2008-04-21 20:01:16.000000000 +0300
+++ b/alsa-kernel/ppc/awacs.c	2008-05-06 13:30:06.000000000 +0300
@@ -695,7 +695,10 @@ static struct snd_kcontrol_new snd_pmac_
 static struct snd_kcontrol_new snd_pmac_awacs_speaker_sw __initdata =
 AWACS_SWITCH("PC Speaker Playback Switch", 1, SHIFT_SPKMUTE, 1);
 
-static struct snd_kcontrol_new snd_pmac_awacs_speaker_sw_imac __initdata =
+static struct snd_kcontrol_new snd_pmac_awacs_speaker_sw_imac1 __initdata =
+AWACS_SWITCH("PC Speaker Playback Switch", 1, SHIFT_PAROUT1, 1);
+
+static struct snd_kcontrol_new snd_pmac_awacs_speaker_sw_imac2 __initdata =
 AWACS_SWITCH("PC Speaker Playback Switch", 1, SHIFT_PAROUT1, 0);
 
 
@@ -772,12 +775,12 @@ static void snd_pmac_awacs_resume(struct
 
 #define IS_PM7500 (machine_is_compatible("AAPL,7500"))
 #define IS_BEIGE (machine_is_compatible("AAPL,Gossamer"))
-#define IS_IMAC (machine_is_compatible("PowerMac2,1") \
-		|| machine_is_compatible("PowerMac2,2") \
+#define IS_IMAC1 (machine_is_compatible("PowerMac2,1"))
+#define IS_IMAC2 (machine_is_compatible("PowerMac2,2") \
 		|| machine_is_compatible("PowerMac4,1"))
 #define IS_G4AGP (machine_is_compatible("PowerMac3,1"))
 
-static int imac;
+static int imac1, imac2;
 
 #ifdef PMAC_SUPPORT_AUTOMUTE
 /*
@@ -823,13 +826,18 @@ static void snd_pmac_awacs_update_automu
 		{
 			int reg = chip->awacs_reg[1]
 				| (MASK_HDMUTE | MASK_SPKMUTE);
-			if (imac) {
+			if (imac1) {
+				reg &= ~MASK_SPKMUTE;
+				reg |= MASK_PAROUT1;
+			} else if (imac2) {
 				reg &= ~MASK_SPKMUTE;
 				reg &= ~MASK_PAROUT1;
 			}
 			if (snd_pmac_awacs_detect_headphone(chip))
 				reg &= ~MASK_HDMUTE;
-			else if (imac)
+			else if (imac1)
+				reg &= ~MASK_PAROUT1;
+			else if (imac2)
 				reg |= MASK_PAROUT1;
 			else
 				reg &= ~MASK_SPKMUTE;
@@ -859,9 +867,12 @@ snd_pmac_awacs_init(struct snd_pmac *chi
 	int pm7500 = IS_PM7500;
 	int beige = IS_BEIGE;
 	int g4agp = IS_G4AGP;
+	int imac;
 	int err, vol;
 
-	imac = IS_IMAC;
+	imac1 = IS_IMAC1;
+	imac2 = IS_IMAC2;
+	imac = imac1 || imac2;
 	/* looks like MASK_GAINLINE triggers something, so we set here
 	 * as start-up
 	 */
@@ -1017,8 +1028,10 @@ snd_pmac_awacs_init(struct snd_pmac *chi
 					snd_pmac_awacs_speaker_vol);
 		if (err < 0)
 			return err;
-		chip->speaker_sw_ctl = snd_ctl_new1(imac
-				? &snd_pmac_awacs_speaker_sw_imac
+		chip->speaker_sw_ctl = snd_ctl_new1(imac1
+				? &snd_pmac_awacs_speaker_sw_imac1
+				: imac2
+				? &snd_pmac_awacs_speaker_sw_imac2
 				: &snd_pmac_awacs_speaker_sw, chip);
 		err = snd_ctl_add(chip->card, chip->speaker_sw_ctl);
 		if (err < 0)