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Commit 01f5966d authored by Daniel T Chen's avatar Daniel T Chen Committed by Takashi Iwai
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ALSA: hda: Fix max PCM level to 0 dB for AD1981_HP 

BugLink: https://bugs.launchpad.net/bugs/461062



The original reporter states that PCM maxes at +12 dB and results in
very bad distortion.  Cap PCM at 0 dB to resolve this symptom.

Signed-off-by: default avatarDaniel T Chen <crimsun@ubuntu.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 950200e2

sound/pci/hda/patch_analog.c

+8 −0
Original line number Diff line number Diff line
@@ -1789,6 +1789,14 @@ static int patch_ad1981(struct hda_codec *codec) 


		codec->patch_ops.init = ad1981_hp_init;

		codec->patch_ops.unsol_event = ad1981_hp_unsol_event;

		/* 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_THINKPAD:

		spec->mixers[0] = ad1981_thinkpad_mixers;