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Commit 2e75d050 authored by Takashi Iwai's avatar Takashi Iwai
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[ALSA] ac97 - Add a workaround for broken quirk for VT1617A codec 



On boards with VT1617A codec, the sound disappears suddenly.
This looks like a problem with HPE-bit control that is supposed to be
set in patch_vt1617a().  However, on such problematic hardwares, the
bit is actually reset mysteriously.

The patch adds a workaround for the wrong quirk.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 564c5bea

sound/pci/ac97/ac97_patch.c

+8 −1
Original line number Diff line number Diff line
@@ -3446,6 +3446,7 @@ static const struct snd_kcontrol_new snd_ac97_controls_vt1617a[] = { 
int patch_vt1617a(struct snd_ac97 * ac97)

{

	int err = 0;

	int val;



	/* we choose to not fail out at this point, but we tell the

	   caller when we return */
@@ -3456,7 +3457,13 @@ int patch_vt1617a(struct snd_ac97 * ac97) 
	/* bring analog power consumption to normal by turning off the

	 * headphone amplifier, like WinXP driver for EPIA SP

	 */

	/* We need to check the bit before writing it.

	 * On some (many?) hardwares, setting bit actually clears it!

	 */

	val = snd_ac97_read(ac97, 0x5c);

	if (!(val & 0x20))

		snd_ac97_write_cache(ac97, 0x5c, 0x20);



	ac97->ext_id |= AC97_EI_SPDIF;	/* force the detection of spdif */

	ac97->rates[AC97_RATES_SPDIF] = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000;

	ac97->build_ops = &patch_vt1616_ops;