windows 10 changes boot order (dual boot w/linux)
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Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=25621
Printed Date: 19 Apr 2024 at 7:42am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: windows 10 changes boot order (dual boot w/linux)
Posted By: joelk
Subject: windows 10 changes boot order (dual boot w/linux)
Date Posted: 16 Mar 2023 at 1:12pm
ASRock Z77 Extreme6 P1.90
I recently installed new ssd and reinstalled Windows 10 and Arch Linux in efi mode. Using GRUB bootloader and os-prober. The GRUB menu shows grub-uefi and windows boot manager as boot options. I configured the UEFI setup with Boot Option #1 grub-uefi and Boot Option #2 Windows Boot Manager.
I mostly use Linux and when rebooting the grub menu comes up and everything works fine. But every time I boot Windows, when I restart the system it immediately boots Windows without showing grub menu at all. I check the UEFI Setup and the boot options are changed to #1 Windows Boot Manager and #2 grub-uefi. I can change it back, but whenever I boot Windows the boot options change again.
How can I prevent this?
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Replies:
Posted By: threadzipper1957
Date Posted: 16 Mar 2023 at 11:38pm
Windows 10 creates multiple partitions, and I don't know if You have more than one disk, checdk where the partitions are located.
And I would google for windows 10 multiboot menu, You will see a lot of help
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Kind Regards
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Posted By: joelk
Date Posted: 17 Mar 2023 at 1:36am
Only 1 disk, and partitions are:
sda1: fat32 efi
sda2: linux-swap
sda3: ext4 linux /
sda4: ext4 linux /home
sda5: ntfs windows10
sda6: microsoft reserved
sda7: ntfs data shared by linux and windows
Everything works as expected except that whenever Windows is booted, the boot priorities in the UEFI setup are changed placing Windows Boot Manager as boot option #1. On next boot I have to press F2 to enter UEFI Setup and change boot option #1 back to grub-uefi and then I will get the normal grub menu enabling selection of either linux or windows.
I don't know whether Windows is changing the UEFI configuration, or whether the UEFI firmware is changing itself when it boots Windows.
I did find a suggested solution here:
https://askubuntu.com/questions/838780/windows-10-changes-uefi-boot-order-every-time" rel="nofollow - https://askubuntu.com/questions/838780/windows-10-changes-uefi-boot-order-every-time
but it took a while to work up the nerve to try it. I don't know much about the UEFI boot sequence as between EFI/Boot/bootx64.efi and EFI/Microsoft/Boot/bootmgfw.efi and EFI/Microsoft/Boot/bootmgr.efi.
Anyway I'm not running ubuntu so my path is a little different but I opened an administrator command prompt in Windows and ran
Bcdedit /set {bootmgr} path \EFI\grub-uefi\grubx64.efi |
That seems to have solved the problem. Windows Boot Manager is still listed as Boot Option #1 in the UEFI Setup, but it nevertheless brings up the grub boot menu and from that I can boot either Arch or Windows as usual.
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Posted By: joelk
Date Posted: 17 Mar 2023 at 1:46am
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Still don't understand why Windows was able to modify the UEFI/bios settings. I've never seen anything like this happen on MBR setups, nor on a new Asus EFI mobo.
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