Ubuntu13.04 how to modify and save the screen brightness

Ubuntu13.04 how to modify and save the screen brightness started ubuntu for more than two months. At first, I just wanted to install ubuntu to learn about linux, then I had a dual system of win7 and ubuntu, and finally I simply killed win7, let ubuntu occupy my local file directly. of course, from windows to linux, there are many inhabits and many problems, but from the tangle of problems to the joy of solving the problem, that feeling may only be understood by people who have experienced it. now I have a lot of gossip. I want to write down the problems and solutions I encountered some time ago. I hope I can help my friends who are still at a loss when I encounter the same problem. problem description: I have used ubuntu12.04, 12.10, and 13.04 that have just been upgraded some time ago. I have encountered the same problem: the fn + f5/f6 key cannot adjust the screen brightness, brightness adjustment can be used to adjust the brightness, but the brightness is automatically restored to the default value after the next boot, that is, the brightness cannot be saved. I am an Asus Ben. Solution: 1. ubuntu12.04 and 12.10. You can modify/etc/default/grub to change GRUB_CMDLINE_LINUX_DEFAULT = "quiet splash" GRUB_CMDLINE_LINUX = "": GRUB_CMDLINE_LINUX_DEFAULT = "quiet splash" GRUB_CMDLINE_LINUX = "acpi_osi = acpi_backlight = vendor" if the intel video card has not been effective after the above steps, you can change the above two lines: GRUB_CMDLINE_LINUX_DEFAULT = "quiet splash" GRUB_CMDLINE_LINUX = "acpi_osi = acpi_backlight = intel" 2. ubuntu13.04 solution: the modification of ubuntu13.04 is slightly different from that of 12.04/12.10. Modify the preceding two rows: partition = "quiet splash" partition = "acpi_osi = Linux" or partition = "quiet splash" GRUB_CMDLINE_LINUX = "acpi_osi = acpi_backlight = vendor" or partition = "quiet splash" partition = "acpi_osi = '! Windows 2012 '"or grub_javasline_linux_default =" quiet splash "grub_javasline_linux =" acpi_osi = '! In Windows 2012, you may need to try a few of the above or later codes. If the above Code is ineffective, try the next or later modifications, the specific function depends on different computers. In addition, if "backlight = vendor" has no effect on intel's graphics card, you can directly change it to "backlight = intel". Finally, what I want to say is that you must try more, in the process of trying again, you can easily play with ubuntu and create your own operating system, it's really far behind windows and linux ....