src/patches/suse-2.6.27.25/patches.drivers/alsa-ad1984-hp-volume-fix

   1 From 13c989beba166b470b1e6b0fa117148bcbfa3dd1 Mon Sep 17 00:00:00 2001
   2 From: Takashi Iwai <tiwai@suse.de>
   3 Date: Mon, 23 Feb 2009 11:33:34 +0100
   4 Subject: ALSA: hda - Don't give over 0dB volume for AD1984A HP laptops
   5 Patch-mainline:
   6 References: bnc#478158
   7
   8 Set the upper limit 0dB to the volume of mixer amp 0x20 for
   9 AD1984A HP laptops.  The overloaded volume may damage the internal
  10 speaker.
  11
  12 Update Wed Apr  1 18:33:51 EDT 2009 jeffm:
  13 - Added the workaround to AD1884A_MOBILE as well.
  14
  15 Signed-off-by: Takashi Iwai <tiwai@suse.de>
  16
  17 ---
  18  sound/pci/hda/patch_analog.c |   16 ++++++++++++++++
  19  1 file changed, 16 insertions(+)
  20
  21 --- a/sound/pci/hda/patch_analog.c
  22 +++ b/sound/pci/hda/patch_analog.c
  23 @@ -3959,6 +3959,14 @@ static int patch_ad1884a(struct hda_code
  24                 spec->input_mux = &ad1884a_laptop_capture_source;
  25                 codec->patch_ops.unsol_event = ad1884a_hp_unsol_event;
  26                 codec->patch_ops.init = ad1884a_hp_init;
  27 +               /* set the upper-limit for mixer amp to 0dB for avoiding the
  28 +                * possible damage by overloading
  29 +                */
  30 +               snd_hda_override_amp_caps(codec, 0x20, HDA_INPUT,
  31 +                                         (0x17 << AC_AMPCAP_OFFSET_SHIFT) |
  32 +                                         (0x17 << AC_AMPCAP_NUM_STEPS_SHIFT) |
  33 +                                         (0x05 << AC_AMPCAP_STEP_SIZE_SHIFT) |
  34 +                                         (1 << AC_AMPCAP_MUTE_SHIFT));
  35                 break;
  36         case AD1884A_MOBILE:
  37                 spec->mixers[0] = ad1884a_mobile_mixers;
  38 @@ -3966,6 +3974,14 @@ static int patch_ad1884a(struct hda_code
  39                 spec->multiout.dig_out_nid = 0;
  40                 codec->patch_ops.unsol_event = ad1884a_hp_unsol_event;
  41                 codec->patch_ops.init = ad1884a_hp_init;
  42 +               /* set the upper-limit for mixer amp to 0dB for avoiding the
  43 +                * possible damage by overloading
  44 +                */
  45 +               snd_hda_override_amp_caps(codec, 0x20, HDA_INPUT,
  46 +                                         (0x17 << AC_AMPCAP_OFFSET_SHIFT) |
  47 +                                         (0x17 << AC_AMPCAP_NUM_STEPS_SHIFT) |
  48 +                                         (0x05 << AC_AMPCAP_STEP_SIZE_SHIFT) |
  49 +                                         (1 << AC_AMPCAP_MUTE_SHIFT));
  50                 break;
  51         case AD1884A_THINKPAD:
  52                 spec->mixers[0] = ad1984a_thinkpad_mixers;