Boot Linux

EFISTUB Arch wiki entry

efibootmgr --disk /dev/sdX --part Y --create --label "Arch Linux" --loader /vmlinuz-linux --unicode 'root=PARTUUID=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX rw initrd=\initramfs-linux.img' --verbose

if you need ucode, add it as first initramfs:

… initrd=/cpu_manufacturer-ucode.img initrd=/initramfs-linux.img

grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=debian --recheck
update-grub

Reason: Clock is set in UTC, Windows thinks it's local time.

Solution:

• UseUTCforRTC.reg

  Windows Registry Editor Version 5.00
   
  [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]
       "RealTimeIsUniversal"=dword:00000001

• Disable Windows time service

  sc config w32time start= disabled

See also: https://help.ubuntu.com/community/UbuntuTime#Multiple_Boot_Systems_Time_Conflicts