I'm troubleshooting a fn-key brightness control problem on my laptop, so I'm wading through a lot of config options in /etc/default/grub, as you can imagine. However, it's raised a question for me:
What's the difference between the lines marked GRUB_CMDLINE_LINUX
and GRUB_CMDLINE_LINUX_DEFAULT
?
For example, does GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
behave any differently than GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor"
?
As an unrelated question, what do any of them have to do with mapping the use of my fn keys? The brightness is already adjustable in System Settings due to some xorg.conf.d/
magic. I just wanna make the keys work.