Re: [alsa-devel] Bug report - patch_realtek.c - Laptop HP COMPAQ B1900 Series

15 Feb 2012

      I have tried to enable each one of them separately, and the speaker 
doesn't work.
I have to use these 3 write_cache to make switch and auto-detect work 
smoothly.
On 2012年02月15日 17:40, Takashi Iwai wrote:
...
At Wed, 15 Feb 2012 17:31:44 +0800,
joey.jiaojg wrote:
...
Here is the diff file.
Thanks.
...
+/* toggle speaker-output according to the hp-jack state */
+static void alc260_b1900_automute(struct hda_codec *codec)
+{

   unsigned int present;

present = snd_hda_jack_detect(codec, 0x0f);
if (present) {
snd_hda_codec_write_cache(codec, 0x01, 0,

			  AC_VERB_SET_GPIO_MASK, 0);

snd_hda_codec_write_cache(codec, 0x01, 0,

			  AC_VERB_SET_GPIO_DIRECTION,

			  0);

What actually this GPIO bit does on your device?
To mute/unmute the speaker?
If so, doesn't the speaker toggle work with just changing the
pin-control of the corresponding pin?
Takashi