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I wish to turn off my keyboard backlight, and I have discovered the files kbd_backlight and kbd_backlight_timeout in /sys/devices/platform/sony-laptop. Both say '-1' when opened in gedit. What values can I change these text files to, what do these values mean, and where do you go to learn such information?

A comment below indicates values for these files are listed in this answer.

  • "parm: kbd_backlight_timeout:set this to 0 to set the default 10 seconds timeout, 1 for 30 seconds, 2 for 60 seconds and 3 to disable timeout (default: 0) (int)" – muru Dec 20 '17 at 8:03
  • Why is the value at -1? What does -1 mean? The question is not a duplicate of that question because I am asking about those files and where their meaning is documented, not asking how to get the backlight working. How do I change the values to 0? I am not able to save changes from gedit because the files are read-only. – DBinJP Dec 20 '17 at 8:07
  • That command is probably all documentation there is; it gets the docs from the module: elixir.free-electrons.com/linux/v3.8/source/drivers/platform/…. If -1 is not given in it, then you'll have to read the code to see what happens when it's -1. – muru Dec 20 '17 at 8:21
  • Why did you post this explanation about those files' values as a comment instead of as an answer? Is it not appropriate to accept what you've said as an answer (if it were posted as an answer)? – DBinJP Dec 20 '17 at 9:44
  • Because I don't see much value in repeating half of what an another comprehensive answer already says. – muru Dec 20 '17 at 9:59