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#powermanagement

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LeeRayl

I really don’t understand Linux power management.

No distro I have used can properly sleep/wake my system. Unless I shut off sleep and run balanced power and turn the screen off it just kills itself after its inactivity period.

It’s frustrating to have to reboot every time I want to touch my system.

Any suggestions? No motherboard power options I can find and #linux #powermanagement

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Dendrobatus Azureus

Do you remember me talking about this wonderful article? the one where you are taught in detail with source snippets how Linux goes bye-bye when it goes to sleep?
The article has so much in-depth details that it takes a lot of time, considerable inteligencia & knowledge to process. Contrary to others I will not only say it, I will explicitly state it is fascinating and a heavy read.

Take your time to process the article; it's worth learning this in depth, in miniatures detail, all the way down to the sources, so you know what goes on, when the power management or your Linux powered VM, or Linux powered Hardware machine, goes down, hard, inexplicable:

To you it will become explainable!

🖋️ #bash #sh #zsh #ksh #csh #tsh #PowerManagement #sleep #hibernate #Linux #POSIX #FOSS #100daysofCode #640DaysOfCode #1024DaysOfCode #programming #GCC #gplusplus #gdb

tookmund.com/2024/09/hibernati

The code snippet is from the file "kernel/power/main.c:688". It defines a static function named "decode_state" that takes a "con" argument. Inside the function, there are preprocessor directives using "#ifdef CONFIG_SUSPEND". It declares variables "state" of type "suspend_state_t", a character pointer "p", and an integer "len". The code uses "memchr" to find a newline character in a buffer and calculates the length. There's a comment "/* Check hibernation first. */" and an if statement that checks the length and a string prefix, potentially returning "PM_SUSPEND_MAX". Another "#ifdef CONFIG_SUSPEND" section includes a for loop that iterates through suspend states, comparing labels and lengths, and potentially returning the "state". Finally, the function returns "PM_SUSPEND_ON". Below the code, there's a comment stating: "Could we have figured this out just via function names? Sure, but this way we".
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