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Dynamic Audio Power Management for Portable Devices …
https://www.kernel.org/doc/html/v5.16/sound/soc/dapm.html
Dynamic Audio Power Management (DAPM) is designed to allow portable Linux devices to use the minimum amount of power within the audio subsystem at all times. It is independent of other kernel PM and as such, can easily co-exist with the other PM systems.
Porting custom audio codec in Linux BSP - Bits & Qubits
http://gopinaths.gitlab.io/post/audio_codec_in_linux/
Easy I2S/PCM audio interface setup between codec and SoC. Each SoC interface and codec registers it’s audio interface capabilities with the core and are subsequently matched and configured when the application hw params are known. Dynamic Audio Power Management (DAPM). DAPM automatically sets the codec to it’s minimum power state at all times.
ASoC Codec Class Driver — The Linux Kernel …
https://www.kernel.org/doc/html/v4.10/sound/soc/codec.html
The codec driver should use the Regmap API for all codec IO. Please see include/linux/regmap.h and existing codec drivers for example regmap usage. ... The Dynamic Audio Power Management description describes the codec power components and their relationships and registers to the ASoC core. Please read dapm.txt for details of building the ...
Power Management in Linux-Based Systems | Linux Journal
https://www.linuxjournal.com/article/6699
This article explains how power management works in Linux (2.4.x) and how it can be implemented in battery-powered systems based on an APM standard, at both the device driver and application levels. ... Flash, LCD, front light, UART, audio codec, touchscreen, keys and power button. The Intel SA1110 CPU supports several power-saving features ...
How to enable audio codec power saving - ThinkWiki
https://www.thinkwiki.org/wiki/How_to_enable_audio_codec_power_saving
How to enable audio codec power saving. The sound device (e.g., AD1981B or AD1892 codecs) requires a noticable amount of power (0.3W on T43).This power can be saved when the device is not in use by disabling it either completely, or partially.
Audio Codecs For Linux | Linuxexperten.com - Teach ...
https://www.linuxexperten.com/content/audio-codecs-linux
An audio codec is a codec (a device or computer program capable of encoding or decoding a digital data stream) that encodes or decodes audio. Examples of audio coding formats include MP3, AAC, Vorbis, FLAC, and Opus. Audio codecs for Linux. In software, an audio codec is a computer program implementing an algorithm that compresses and ...
AM3358: Disabling audio codec power saving - Processors ...
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/664733/am3358-disabling-audio-codec-power-saving
Dynamic Audio Power Management (DAPM): DAPM automatically sets the codec to it's minimum power state at all times. This includes powering up/down internal power blocks depending on the internal codec audio routing and any active streams. To achieve all this, ASoC splits an embedded audio system into three components:
linux mint - How to disable the power saving for snd_hda ...
https://unix.stackexchange.com/questions/565886/how-to-disable-the-power-saving-for-snd-hda-codec-realtek
I'm on Linux Mint 19.3 (Kernel 5.3.0-28) and my mainboard comes with a Realtek ALC887 onboard chip (snd_hda_codec_realtek). Due to the default power managment the power saving state switches on and off on a regular basis, resulting in noticable "click" sounds when the codec gets switched back on to full power.
4.2. Example — Laptop Red Hat Enterprise Linux 6 | Red Hat ...
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/power_management_guide/example_laptop
For example, a 1 Gbit/s network interface running at 100 Mbits/s saves around 3–4 watts. For a typical server with a total power consumption of around 400 watts, this saving is approximately 1 %. On a laptop with a total power consumption of around 40 watts, the power saving on just this one component amounts to 10 % of the total.
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