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| author | Daniel T Chen <crimsun@ubuntu.com> | 2009-12-13 16:22:58 -0500 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-12-14 11:08:39 +0100 |
| commit | 01f5966d2f36f08eb6604665eade69c9f38ffaed (patch) | |
| tree | 09c26e3eab404e16be54fac56f75e6bd232553e0 | |
| parent | 950200e2ff11daae1c5d9426703bdd494603f38b (diff) | |
| download | op-kernel-dev-01f5966d2f36f08eb6604665eade69c9f38ffaed.zip op-kernel-dev-01f5966d2f36f08eb6604665eade69c9f38ffaed.tar.gz | |
ALSA: hda: Fix max PCM level to 0 dB for AD1981_HP
BugLink: https://bugs.launchpad.net/bugs/461062
The original reporter states that PCM maxes at +12 dB and results in
very bad distortion. Cap PCM at 0 dB to resolve this symptom.
Signed-off-by: Daniel T Chen <crimsun@ubuntu.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | 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 447eda1..1a36137 100644 --- a/sound/pci/hda/patch_analog.c +++ b/sound/pci/hda/patch_analog.c @@ -1789,6 +1789,14 @@ static int patch_ad1981(struct hda_codec *codec) codec->patch_ops.init = ad1981_hp_init; codec->patch_ops.unsol_event = ad1981_hp_unsol_event; + /* 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_THINKPAD: spec->mixers[0] = ad1981_thinkpad_mixers; |
