This Linux kernel change "ALSA: hda/realtek – Set default power save node to 0" is included in the Linux 5.2 release. This change is authored by Kailang Yang <kailang [at] realtek.com> on Thu May 23 14:43:04 2019 +0800. The commit for this change in Linux stable tree is 317d931 (patch).
ALSA: hda/realtek - Set default power save node to 0 I measured power consumption between power_save_node=1 and power_save_node=0. It's almost the same. Codec will enter to runtime suspend and suspend. That pin also will enter to D3. Don't need to enter to D3 by single pin. So, Disable power_save_node as default. It will avoid more issues. Windows Driver also has not this option at runtime PM. Signed-off-by: Kailang Yang <firstname.lastname@example.org> Cc: <email@example.com> Signed-off-by: Takashi Iwai <firstname.lastname@example.org>
There are 2 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.
sound/pci/hda/patch_realtek.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c index b984bd1..1ca2a83 100644 --- a/sound/pci/hda/patch_realtek.c +++ b/sound/pci/hda/patch_realtek.c @@ -7711,7 +7711,7 @@ static int patch_alc269(struct hda_codec *codec) spec = codec->spec; spec->gen.shared_mic_vref_pin = 0x18; - codec->power_save_node = 1; + codec->power_save_node = 0; #ifdef CONFIG_PM codec->patch_ops.suspend = alc269_suspend;