At Wed, 30 Jan 2008 09:14:02 -0500, Matthew Ranostay wrote:
On several laptops that have STAC9228 codecs have unused DACs, this powers them down to a D3 state.
Signed-off-by: Matthew Ranostay mranostay@embeddedalley.com
I think they will be eventually powered up again in hda_set_power_state() in hda_codec.c. As a temporary solution, we can have a sort of blacklist in struct hda_codec for always turning the power off for such widgets.
As a long-term solution, the automatic detection of such widgets would be nice...
Takashi
diff -r 86c8c0a82bb9 pci/hda/patch_sigmatel.c --- a/pci/hda/patch_sigmatel.c Wed Jan 30 11:52:33 2008 +0100 +++ b/pci/hda/patch_sigmatel.c Wed Jan 30 08:58:37 2008 -0500 @@ -288,6 +288,10 @@ static hda_nid_t stac927x_adc_nids[3] =
static hda_nid_t stac927x_mux_nids[3] = { 0x15, 0x16, 0x17 +};
+static hda_nid_t stac927x_dac_nids[5] = {
- 0x02, 0x03, 0x04, 0x05, 0x06
};
static hda_nid_t stac927x_dmux_nids[1] = { @@ -3537,7 +3541,7 @@ static int patch_stac927x(struct hda_cod static int patch_stac927x(struct hda_codec *codec) { struct sigmatel_spec *spec;
- int err;
int err, i;
spec = kzalloc(sizeof(*spec), GFP_KERNEL); if (spec == NULL)
@@ -3628,6 +3632,14 @@ static int patch_stac927x(struct hda_cod stac92xx_free(codec); return err; }
/* on some 3-stack systems not all the DACs are used
* this powers down ones that aren't used*/for (i = 0; i < ARRAY_SIZE(stac927x_dac_nids); i++)
if (!is_in_dac_nids(spec, stac927x_dac_nids[i]))snd_hda_codec_write_cache(codec, stac927x_dac_nids[i],0, AC_VERB_SET_POWER_STATE, AC_PWRST_D3);codec->patch_ops = stac92xx_patch_ops;