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ALSA: hda: Fix 0 dB offset for HP laptops using CX20551 (Waikiki)

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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@gmail.com>
Tested-by: Mike Pontillo <pontillo@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: Daniel T Chen <crimsun@ubuntu.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Daniel T Chen 2010-03-21 18:34:43 -04:00 committed by Takashi Iwai
parent e3d2530a6c
commit 025f206c9e
1 changed files with 15 additions and 0 deletions
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15
sound/pci/hda/patch_conexant.c
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@ -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;
}