Hi, Attached is a patch to fix distortion at max PCM setting for HP laptops using CX20551 (Waikiki). Best, -Dan
From 8442bd67f25ab5df43c99549480d5011fa3cb9c1 Mon Sep 17 00:00:00 2001 From: Daniel T Chen <crimsun@xxxxxxxxxx> Date: Sun, 21 Mar 2010 18:34:43 -0400 Subject: [PATCH] ALSA: hda: Fix 0 dB offset for HP laptops using CX20551 (Waikiki) BugLink: https://launchpad.net/bugs/420578 The OR has verified that his hardware distorts because of the 0 dB offset not corresponding to the highest PCM level. Fix this by capping said PCM level to 0 dB similarly to what we do for CX20549 (Venice). Reported-by: Mike Pontillo <pontillo@xxxxxxxxx> Tested-by: Mike Pontillo <pontillo@xxxxxxxxx> Cc: <stable@xxxxxxxxxx> Signed-off-by: Daniel T Chen <crimsun@xxxxxxxxxx> --- sound/pci/hda/patch_conexant.c | 15 +++++++++++++++ 1 files changed, 15 insertions(+), 0 deletions(-) diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c index 194a28c..61682e1 100644 --- a/sound/pci/hda/patch_conexant.c +++ b/sound/pci/hda/patch_conexant.c @@ -1591,6 +1591,21 @@ static int patch_cxt5047(struct hda_codec *codec) #endif } spec->vmaster_nid = 0x13; + + switch (codec->subsystem_id >> 16) { + case 0x103c: + /* HP laptops have really bad sound over 0 dB on NID 0x10. + * Fix max PCM level to 0 dB (originally it has 0x1e steps + * with 0 dB offset 0x17) + */ + snd_hda_override_amp_caps(codec, 0x10, 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; + } + return 0; } -- 1.7.0
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