linux-kernel - [046/116] ALSA: hda: Fix 0 dB offset for HP laptops using CX20551 (Waikiki)

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Date:	Tue, 30 Mar 2010 15:55:24 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Daniel T Chen <crimsun@...ntu.com>,
	Takashi Iwai <tiwai@...e.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [046/116] ALSA: hda: Fix 0 dB offset for HP laptops using CX20551 (Waikiki)

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Daniel T Chen <crimsun@...ntu.com>

commit 025f206c9e0f96cc41567b01c07fb852d8900da1 upstream.

BugLink: https://launchpad.net/bugs/420578

The OR has verified that his hardware distorts because of the 0 dB
offset not corresponding to the highest PCM level. Fix this by capping
said PCM level to 0 dB similarly to what we do for CX20549 (Venice).

Reported-by: Mike Pontillo <pontillo@...il.com>
Tested-by: Mike Pontillo <pontillo@...il.com>
Signed-off-by: Daniel T Chen <crimsun@...ntu.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 sound/pci/hda/patch_conexant.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/sound/pci/hda/patch_conexant.c
+++ b/sound/pci/hda/patch_conexant.c
@@ -1581,6 +1581,21 @@ static int patch_cxt5047(struct hda_code
 #endif	
 	}
 	spec->vmaster_nid = 0x13;
+
+	switch (codec->subsystem_id >> 16) {
+	case 0x103c:
+		/* HP laptops have really bad sound over 0 dB on NID 0x10.
+		 * Fix max PCM level to 0 dB (originally it has 0x1e steps
+		 * with 0 dB offset 0x17)
+		 */
+		snd_hda_override_amp_caps(codec, 0x10, HDA_INPUT,
+					  (0x17 << AC_AMPCAP_OFFSET_SHIFT) |
+					  (0x17 << AC_AMPCAP_NUM_STEPS_SHIFT) |
+					  (0x05 << AC_AMPCAP_STEP_SIZE_SHIFT) |
+					  (1 << AC_AMPCAP_MUTE_SHIFT));
+		break;
+	}
+
 	return 0;
 }
 


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