From e4c3bf0f65ec9da8b067a722f734d1012ef12ceb Mon Sep 17 00:00:00 2001 From: James C Georgas Date: Tue, 19 Dec 2006 11:09:41 +0100 Subject: [ALSA] Remove AC97 POP control for STAC9708/11 The STAC9708/11 AC97 codecs implement the PCM Out Path & Mute bit in the General Purpose register (0x20:F), even though they don't implement the actual function in the mixer. Since the alsa tests for the function by toggling the bit and reading it back to see if it changed, it mistakenly creates a useless control. This patch explicitly removes the control when the codec is an STAC9708/11. I put the check in patch_sigmatel_stac9708_specific(), because I have an SBLive with this chip on it. I don't know if the STAC9758 or other codecs also behave this way. If they do, then this check could maybe go in patch_sigmatel_stac97xx_specific(), or some other more general function. Signed-off-by: James C Georgas Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela --- sound/pci/ac97/ac97_patch.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sound/pci/ac97/ac97_patch.c b/sound/pci/ac97/ac97_patch.c index 123de550d1f..818a77d2def 100644 --- a/sound/pci/ac97/ac97_patch.c +++ b/sound/pci/ac97/ac97_patch.c @@ -941,6 +941,9 @@ static int patch_sigmatel_stac9708_specific(struct snd_ac97 *ac97) { int err; + /* the register bit is writable, but the function is not implemented: */ + snd_ac97_remove_ctl(ac97, "PCM Out Path & Mute", NULL); + snd_ac97_rename_vol_ctl(ac97, "Headphone Playback", "Sigmatel Surround Playback"); if ((err = patch_build_controls(ac97, &snd_ac97_stac9708_bias_control, 1)) < 0) return err; -- cgit v1.2.3-70-g09d2