Hello, I'm trying to dual boot Arch with Windows 8.1 on an HP Pavilion 15-n216sf with Windows 8.1 pre-installed. I have followed https://wiki.archlinux.org/index.php/Unified_Extensible_Firmware_Interface https://wiki.archlinux.org/index.php/Grub I copied the ARCH install ISO to a USB stick with dd and installed ARCH in the usual way. Here is the disk layout from cgdisk : Number Start (sector) End (sector) Size Code Name 1 2048 821247 400.0 MiB 2700 Basic data partition 2 821248 1353727 260.0 MiB EF00 EFI system partition 3 1353728 1615871 128.0 MiB 0C01 Microsoft reserved ... 4 1615872 167604223 79.1 GiB 0700 Basic data partition 5 1425895424 1465147391 18.7 GiB 0700 Basic data partition 6 167604224 209547263 20.0 GiB 8300 ARCH_ROOT 7 209547264 251490303 20.0 GiB 8300 AUTRE_ROOT 8 251490304 259878911 4.0 GiB 8200 SWAP 9 259878912 1425895423 556.0 GiB 8300 HOME ARCH is installed in /dev/sda6. /dev/sda4 is where Windows lives, /dev/sda5 is the recovery partition. In arch-chroot, I mounted the ESP /dev/sda2 in /boot/efi and ran grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=grub --recheck --debug with no errors. Then I ran grub-mkconfig -o /boot/grub/grub.cfg On boot, GRUB is not loaded at all, the laptop boots on Windows 8.1. After pressing F9 fo the boot options menu, there is one entry starting with grub, selecting this entry keeps booting Windows. There is a grubx64.efi file in /boot/efi/grub. I have copied /etc/grub.d/40_custom from the section https://wiki.archlinux.org/index.php/Grub#Dual-booting with the relevant UUID changed to be that of /dev/sda2 (ESP). So I can't find a way to dual boot with ARCH and I'm stuck with this. I have noted one weird thing with efibootmgr -v from arch-chroot, with fails with an invalid pointer message and lots of backtrace, and the following output : BootCurrent: 0001 Timeout: 2 seconds BootOrder: 0002,0000,3000,2001,2002,2003 Boot0000* Windows Boot Manager HD(2,c8800,82000,dc61d0de-af32-472f-8c54- fdafe931e191)File(\EFI\Microsoft\Boot\bootmgfw.efi)(invalid optional data length) Boot0001* USB Hard Drive (UEFI) - USB DISK 2.0 I am hereby requesting help to solve this issue. Thank you.
