Fixes for 5.10

[thirdparty/kernel/stable-queue.git] / releases / 2.6.32.12 / alsa-hda-fix-0-db-offset-for-lenovo-thinkpad-models-using-ad1981.patch

From b8e80cf386419453678b01bef830f53445ebb15d Mon Sep 17 00:00:00 2001
From: Daniel T Chen <crimsun@ubuntu.com>
Date: Tue, 30 Mar 2010 13:29:28 -0400
Subject: ALSA: hda: Fix 0 dB offset for Lenovo Thinkpad models using AD1981

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

commit b8e80cf386419453678b01bef830f53445ebb15d upstream.

BugLink: https://launchpad.net/bugs/551606

The OR's hardware distorts at PCM 100% because it does not correspond to
0 dB. Fix this in patch_ad1981() for all models using the Thinkpad
quirk.

Reported-by: Jane Silber
Signed-off-by: Daniel T Chen <crimsun@ubuntu.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 sound/pci/hda/patch_analog.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/sound/pci/hda/patch_analog.c
+++ b/sound/pci/hda/patch_analog.c
@@ -1789,6 +1789,14 @@ static int patch_ad1981(struct hda_codec
 	case AD1981_THINKPAD:
 		spec->mixers[0] = ad1981_thinkpad_mixers;
 		spec->input_mux = &ad1981_thinkpad_capture_source;
+		/* set the upper-limit for mixer amp to 0dB for avoiding the
+		 * possible damage by overloading
+		 */
+		snd_hda_override_amp_caps(codec, 0x11, 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;
 	case AD1981_TOSHIBA:
 		spec->mixers[0] = ad1981_hp_mixers;