The Intel HDA driver has a power-saving mode to suspend the soundcard after some time of inactivity. Jan 01, 2021 The sound card has an SNR ratio of 106 dB and can deliver up to 600 ohms of power for high impedance studio-grade headphones. It comes with five 3.5mm jacks, where two are for input and three are for output. It also features a 24-bit 192kHz digital-to-analog converter for playback.

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This article describes the setup of power management of sound devices.

Power-saving mode

The Intel HDA driver has a power-saving mode to suspend the soundcard after some time of inactivity.

Kernel

Systems with an AC97 soundcard need to activate the following kernel options:

Systems with a HDA soundcard need to activate the following kernel options:

When the driver is loaded as a module then it may be needed to enable power saving by means of a module parameter:

Runtime tuning

The driver can be tuned in the sysfs filesystem under /sys/module/snd_hda_intel/parameters:

• The power_save_controller knob controls, if power-saving mode is enabled. It is preset by the kernel option ... power-saving ....
• The power_save knob sets the time-out in seconds. It is preset by the kernel option Default time-out ...

pm-utils

The sys-power/pm-utils package contains a script to enable the power-saving mode when on battery and disable when on AC. It overrides the default values of the kernel.

If you use pm-utils, but don't want this kind of regulation, disable the script:

Power Sound Editor

PulseAudio

If you have an Intel HDA soundcard and use PulseAudio, you probably want the following kernel option to improve power-saving:

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Troubleshooting

If you hear a unwanted click sound, when the power-saving mode enables, disable the power-saving mode in the kernel.

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