Summary of Grub boot repair + brightness adjustment in Windows+ubuntu dual system

Resources:
1.grub Boot FIX: http://forum.ubuntu.org.cn/viewtopic.php?t=348503
2. Brightness adjustment, integrated on-line knowledge

Grub Boot FIX:
1. In grub rescue mode, use the LS, ls (hd0,xxx) command to find a partition similar to grub or Boot/grub
2. Locate the Post set Root,set prefix,insmod, temporarily fix grub
3. Then go to Linux and use
sudo update-grub
sudo grub-install/dev/sda
Repairing Grub

Brightness adjustment:
1. Using sudo vi/etc/default/grub, put grub_cmdline_linux= ""
Change to Grub_cmdline_linux= "Acpi_backlight=vendor", you can make the system settings have brightness adjustment bar, you can use the FN shortcut to adjust brightness (but on my computer, is false adjustment)

1. Intel graphics can modify the brightness of the brightness file under Intel_backlight in/sys/class/backlight (no Intel graphics card, I cannot test)
2. Add echo 5>/sys/class/backlight/xxxx/brightness to/etc/rc.local can set the initial brightness of the screen, the value 5 can be modified, XXXX for the specific path, you can try more points.

Dual-System Mouth hu:
1. Create a new sub-volume and install Linux with Linux boot disk
2. After loading the general boot is the default grub boot, you can go to Windows, through EASYBCD change back to Windows boot

Summary of Grub boot repair + brightness adjustment in Windows+ubuntu dual system