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authorDaniel T Chen <crimsun@ubuntu.com>2010-03-30 13:29:28 -0400
committerTakashi Iwai <tiwai@suse.de>2010-03-31 11:47:14 +0200
commitb8e80cf386419453678b01bef830f53445ebb15d (patch)
tree4b987b27f823c46412411aa17e821dbb5954a4b7 /sound/pci/hda
parent1f85d72d2c9c9a1d6d32cf325936bc224ad5d591 (diff)
ALSA: hda: Fix 0 dB offset for Lenovo Thinkpad models using AD1981
BugLink: https://launchpad.net/bugs/551606 The OR's hardware distorts at PCM 100% because it does not correspond to 0 dB. Fix this in patch_ad1981() for all models using the Thinkpad quirk. Reported-by: Jane Silber Cc: <stable@kernel.org> Signed-off-by: Daniel T Chen <crimsun@ubuntu.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/hda')
-rw-r--r--sound/pci/hda/patch_analog.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/sound/pci/hda/patch_analog.c b/sound/pci/hda/patch_analog.c
index e6d1bdff1b6e..af34606c30c3 100644
--- a/sound/pci/hda/patch_analog.c
+++ b/sound/pci/hda/patch_analog.c
@@ -1896,6 +1896,14 @@ static int patch_ad1981(struct hda_codec *codec)
case AD1981_THINKPAD:
spec->mixers[0] = ad1981_thinkpad_mixers;
spec->input_mux = &ad1981_thinkpad_capture_source;
+ /* 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_TOSHIBA:
spec->mixers[0] = ad1981_hp_mixers;