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Commit b8e80cf3 authored by Daniel T Chen's avatar Daniel T Chen Committed by Takashi Iwai
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ALSA: hda: Fix 0 dB offset for Lenovo Thinkpad models using AD1981 

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
Cc: <stable@kernel.org>
Signed-off-by: default avatarDaniel T Chen <crimsun@ubuntu.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 1f85d72d

sound/pci/hda/patch_analog.c

+8 −0
Original line number Diff line number Diff line
@@ -1896,6 +1896,14 @@ static int patch_ad1981(struct hda_codec *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;