Hi Takashi, Jaroslav, This patch adds two mixer controls. The V_REFOUT disable is a documented register that is used to decouple the microphone input lines from the DC source. The High Pass Filter disable in the AC97_AD_TEST2 (0x5c) is an undocumented register provided by Miller Puckette via Analog Devices that is used to prevent the AD codec from applying a high pass filter to the input. Thanks, Jaya Kumar Signed-off-by: Jaya Kumar <jayakumar.alsa@xxxxxxxxx> --- include/sound/ac97_codec.h | 1 + sound/pci/ac97/ac97_patch.c | 2 ++ 2 files changed, 3 insertions(+) --- diff -X cs5535audio.dontdiff -X linux-2.6.17-rc5/Documentation/dontdiff -uprN linux-2.6.17-rc5-ad1888pm/include/sound/ac97_codec.h linux-2.6.17-rc5-ad1888vref/include/sound/ac97_codec.h --- linux-2.6.17-rc5-ad1888pm/include/sound/ac97_codec.h 2006-06-18 15:50:59.000000000 +0800 +++ linux-2.6.17-rc5-ad1888vref/include/sound/ac97_codec.h 2006-06-22 04:06:35.000000000 +0800 @@ -265,6 +265,7 @@ /* specific - Analog Devices */ #define AC97_AD_TEST 0x5a /* test register */ +#define AC97_AD_TEST2 0x5c /* undocumented test register 2 */ #define AC97_AD_CODEC_CFG 0x70 /* codec configuration */ #define AC97_AD_JACK_SPDIF 0x72 /* Jack Sense & S/PDIF */ #define AC97_AD_SERIAL_CFG 0x74 /* Serial Configuration */ diff -X cs5535audio.dontdiff -X linux-2.6.17-rc5/Documentation/dontdiff -uprN linux-2.6.17-rc5-ad1888pm/sound/pci/ac97/ac97_patch.c linux-2.6.17-rc5-ad1888vref/sound/pci/ac97/ac97_patch.c --- linux-2.6.17-rc5-ad1888pm/sound/pci/ac97/ac97_patch.c 2006-06-18 15:40:03.000000000 +0800 +++ linux-2.6.17-rc5-ad1888vref/sound/pci/ac97/ac97_patch.c 2006-06-22 04:10:25.000000000 +0800 @@ -1873,6 +1873,8 @@ static const struct snd_kcontrol_new snd .get = snd_ac97_ad1888_lohpsel_get, .put = snd_ac97_ad1888_lohpsel_put }, + AC97_SINGLE("V_REFOUT Disable", AC97_AD_MISC, 2, 1, 0), + AC97_SINGLE("High Pass Filter Disable", AC97_AD_TEST2, 12, 1, 0), AC97_SINGLE("Spread Front to Surround and Center/LFE", AC97_AD_MISC, 7, 1, 0), { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, All the advantages of Linux Managed Hosting--Without the Cost and Risk! Fully trained technicians. The highest number of Red Hat certifications in the hosting industry. Fanatical Support. Click to learn more http://sel.as-us.falkag.net/sel?cmd=lnk&kid=107521&bid=248729&dat=121642 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel