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_LI
![What is the difference between GRUB_CMDLINE_LINUX and GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub](https://cdn-ak-scissors.b.st-hatena.com/image/square/664a2d3dc991972667a15e0e849615b9670c436b/height=288;version=1;width=512/https%3A%2F%2Fcdn.sstatic.net%2FSites%2Faskubuntu%2FImg%2Fapple-touch-icon%402.png%3Fv%3Dc492c9229955)