Hi, Attached please find a patch against sound-2.6 (also applicable to stable trees) that fixes the reported distortion for Lenovo models on CX20549. Best, -Dan
From 1e7c9f5188c8e110b90e42f820b15f4c3c7034b0 Mon Sep 17 00:00:00 2001 From: Daniel T Chen <crimsun@xxxxxxxxxx> Date: Mon, 10 May 2010 21:50:04 +0200 Subject: [PATCH] ALSA: hda: Fix 0 dB for Lenovo models using Conexant CX20549 (Venice) Reference: http://mailman.alsa-project.org/pipermail/alsa-devel/2010-May/027525.html As reported on the mailing list, we also need to cap to the 0 dB offset for Lenovo models, else the sound will be distorted. Reported-and-Tested-by: Tim Starling <tstarling@xxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxx> Signed-off-by: Daniel T Chen <crimsun@xxxxxxxxxx> --- sound/pci/hda/patch_conexant.c | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-) diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c index c8e83f5..e863649 100644 --- a/sound/pci/hda/patch_conexant.c +++ b/sound/pci/hda/patch_conexant.c @@ -1198,9 +1198,10 @@ static int patch_cxt5045(struct hda_codec *codec) case 0x103c: case 0x1631: case 0x1734: - /* HP, Packard Bell, & Fujitsu-Siemens laptops have really bad - * sound over 0dB on NID 0x17. Fix max PCM level to 0 dB - * (originally it has 0x2b steps with 0dB offset 0x14) + case 0x17aa: + /* HP, Packard Bell, Fujitsu-Siemens & Lenovo laptops have + * really bad sound over 0dB on NID 0x17. Fix max PCM level to + * 0 dB (originally it has 0x2b steps with 0dB offset 0x14) */ snd_hda_override_amp_caps(codec, 0x17, HDA_INPUT, (0x14 << AC_AMPCAP_OFFSET_SHIFT) | -- 1.7.0.4
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