At Sun, 21 Mar 2010 19:01:18 -0400, Daniel Chen wrote: > > Hi, > > Attached is a patch to fix distortion at max PCM setting for HP > laptops using CX20551 (Waikiki). Applied now. Thanks. Takashi > > Best, > -Dan > [2 0001-ALSA-hda-Fix-0-dB-offset-for-HP-laptops-using-CX2055.patch <text/x-patch; US-ASCII (base64)>] > 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 > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
