![]() SMBus and its cousin I2C are my best guess. ![]() Lastly, you could explore the low speed buses of your system for devices that do undocumented things. Next, you could try to find the manufacturer's API for the backlight. You might want to poke around in your pre-boot setup screens (sometimes mistakenly called BIOS setup screens) and see if there are any knobs in those screens. On the Windows side there may be some magic proprietary application that knows where those RGB registers are and how to write them. Then, when Linux turns on the backlight, the stored values are used. ![]() Those registers sound like they are either non volatile or are written by the BIOS or UEFI environment at boot to restore the previous values. My guess is that there is an i2c (or SMBus) device that has registers for the R,G and B values that drive PWM LED drivers. And a really good title to ensure anyone who can help sees the threadĮdit: You might try exploring /sys/class/leds to see if there is anything interesting that may be related to keyboard backlight.Ī tri-color LED keyboard backlight is not exactly standardized in the PC architecture. I suspect there not many here with your issue, so patience is needed. My system's keyboard backlight are just white, I am afraid I cannot help. Sadly, not everyone follows this rule … way_street The owner of a thread is the one who marks it as solved in truth, only the person asking the questions really knows if it is solved or not. i guess i will check the thread later to see if i get another response? i am really not sure what you need from me. the word title appears once and it refers to adding 'solved' when it becomes solved. I have read the rules several times the rules do not even contain the word combination 'thread title'.
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