Commit 40088dc4 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: hda - Revert power_save option default value

With the commit 1ba8f9d3 ("ALSA: hda: Add a power_save
blacklist"), we changed the default value of power_save option to -1
for processing the power-save blacklist.
Unfortunately, this seems breaking user-space applications that
actually read the power_save parameter value via sysfs and judge /
adjust the power-saving status.  They see the value -1 as if the
power-save is turned off, although the actual value is taken from
CONFIG_SND_HDA_POWER_SAVE_DEFAULT and it can be a positive.

So, overall, passing -1 there was no good idea.  Let's partially
revert it -- at least for power_save option default value is restored
again to CONFIG_SND_HDA_POWER_SAVE_DEFAULT.  Meanwhile, in this patch,
we keep the blacklist behavior and make is adjustable via the new
option, pm_blacklist.

Fixes: 1ba8f9d3

 ("ALSA: hda: Add a power_save blacklist")
Acked-by: default avatarHans de Goede <>
Cc: <>
Signed-off-by: default avatarTakashi Iwai <>
parent 01c0b426
......@@ -181,11 +181,15 @@ static const struct kernel_param_ops param_ops_xint = {
#define param_check_xint param_check_int
static int power_save = -1;
static int power_save = CONFIG_SND_HDA_POWER_SAVE_DEFAULT;
module_param(power_save, xint, 0644);
MODULE_PARM_DESC(power_save, "Automatic power-saving timeout "
"(in second, 0 = disable).");
static bool pm_blacklist = true;
module_param(pm_blacklist, bool, 0644);
MODULE_PARM_DESC(pm_blacklist, "Enable power-management blacklist");
/* reset the HD-audio controller in power save mode.
* this may give more power-saving, but will take longer time to
* wake up.
......@@ -2300,10 +2304,9 @@ static int azx_probe_continue(struct azx *chip)
val = power_save;
#ifdef CONFIG_PM
if (val == -1) {
if (pm_blacklist) {
const struct snd_pci_quirk *q;
q = snd_pci_quirk_lookup(chip->pci, power_save_blacklist);
if (q && val) {
dev_info(chip->card->dev, "device %04x:%04x is on the power_save blacklist, forcing power_save to 0\n",
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