Hi, Attached is a patch against sound-2.6 master HEAD (applicable to 2.6.32.y and 2.6.33.y) that clamps the 0 dB offset accordingly. Best, -Dan
From fdf6a8727da7189f23e3cfe94140f38513144468 Mon Sep 17 00:00:00 2001 From: Daniel T Chen <crimsun@xxxxxxxxxx> Date: Tue, 30 Mar 2010 13:29:28 -0400 Subject: [PATCH] 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@xxxxxxxxxx> Signed-off-by: Daniel T Chen <crimsun@xxxxxxxxxx> --- sound/pci/hda/patch_analog.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/sound/pci/hda/patch_analog.c b/sound/pci/hda/patch_analog.c index 262f5b5..9cbd80c 100644 --- a/sound/pci/hda/patch_analog.c +++ b/sound/pci/hda/patch_analog.c @@ -1904,6 +1904,14 @@ 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; -- 1.7.0
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