On Wednesday 14 May 2014 16:31:13, Gabriele Mazzotta gabriele.mzt@gmail.com wrote:
Disable the AA-loopback path to get rid of the constant white noise that can be heard when headphones are used.
This patch was tested only on a Dell XPS13 9333.
Fix based on d2e92709e88d ("ALSA: hda - Disable AA-loopback on ALC283 Chromebook").
Signed-off-by: Gabriele Mazzotta gabriele.mzt@gmail.com
sound/pci/hda/patch_realtek.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c index 5f7c765..21c94e4 100644 --- a/sound/pci/hda/patch_realtek.c +++ b/sound/pci/hda/patch_realtek.c @@ -5690,6 +5690,13 @@ static int patch_alc662(struct hda_codec *codec) if (has_cdefine_beep(codec)) spec->gen.beep_nid = 0x01;
- switch (codec->vendor_id) {
- case 0x10ec0668:
/* Disable AA-loopback as it causes white noise */spec->gen.mixer_nid = 0;break;- }
- if ((alc_get_coef0(codec) & (1 << 14)) && codec->bus->pci && codec->bus->pci->subsystem_vendor == 0x1025 && spec->cdefine.platform_type == 1) {
I'm sorry, I was wrong. This patch does not help. I'm still trying to understand what temporarily fixed the problem, I was quite sure this patch did it, but all of the sudden the noise came back. I'm still trying to find the real cause, but I doubt I'll succeed.
Regards, Gabriele