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ALSA: hda - Don't give over 0dB volume for AD1984A HP laptops

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Set the upper limit 0dB to the volume of mixer amp 0x20 for
AD1984A HP laptops.  The overloaded volume may damage the internal
speaker.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-02-23 11:33:34 +01:00
parent 1618a3281b
commit 13c989beba
1 changed files with 8 additions and 0 deletions
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8
sound/pci/hda/patch_analog.c
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@ -3986,6 +3986,14 @@ static int patch_ad1884a(struct hda_codec *codec)
spec->multiout.dig_out_nid = 0;
codec->patch_ops.unsol_event = ad1884a_hp_unsol_event;
codec->patch_ops.init = ad1884a_hp_init;
/* set the upper-limit for mixer amp to 0dB for avoiding the
* possible damage by overloading
*/
snd_hda_override_amp_caps(codec, 0x20, 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 AD1884A_THINKPAD:
spec->mixers[0] = ad1984a_thinkpad_mixers;