[PATCH] Maestro2 hw volume fix

["Ville Syrjälä" <syrjala@sci.fi>]

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The attached patch fixes hardware volume buttons on my Dell Inspiron 7000 
laptop. The chip is ESS Maestro2 (0x125d:0x1968).

I have no idea if this will break things for someone else. Since the 
datasheet didn't help me understand the registers involved I just printed 
their contents and came up with the used bits.

All registers had the following values in my tests:
mute:     0x99
vol down: 0x77
vol up:   0xBB

-- 
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/

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--- alsa-driver-0.9.8/alsa-kernel/pci/es1968.c.orig	2003-10-14 16:59:20.000000000 +0300
+++ alsa-driver-0.9.8/alsa-kernel/pci/es1968.c	2004-02-17 08:06:22.000000000 +0200
@@ -1967,14 +1967,14 @@
 
 	/* FIXME: more clean up is needed.. */
 	val = chip->ac97->regs[AC97_MASTER];
-	if (x & 1) {
+	if (!(x & 2)) {
 		/* mute */
 		snd_ac97_write_cache(chip->ac97, AC97_MASTER, val ^ 0x8000);
 		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
 			       &chip->master_switch->id);
 	} else {
 		val &= 0x7fff;
-		if (((x>>1) & 7) > 4) {
+		if (!(x & 4)) {
 			/* volume up */
 			if ((val & 0xff) > 0)
 				val--;