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#1 2024-12-26 10:50:03

doragasu
Member
Registered: 2012-03-03
Posts: 159

Windows 11 24H2 deletes grub EFI entry on every boot

I have a dual boot setup with Arch and Windows 11 that has been working without a problem for years. But recently Windows updated to feature version 24H2 and since then, each time I boot Windows, it completely removes the grub EFI entry, so I have to boot from the Arch install medium and reinstall grub. A quick search will reveal this is a common problem with many different suggested solutions, but none I tried works for me. This is what I tried without luck:

1. On Windows, disable System Protection.
2. On Windows disable Fast Startup
3. On Windows use bcdedit to change boot path to where the GRUB EFI binary is (\EFI\Linux\grubx64.efi)
4. On Linux use efibootmgr to disable the Windows boot entry, and then change the boot order so the (disabled) Windows boot entry is the first one.

None of these have worked. My PC has 3 disks, and I suspect Windows might be getting confused about on which disk boot should be stored, and reinstalling it on every boot. Because bcdedit points to Volume3 (sorry for the spanish text):

C:\Windows\System32>bcdedit

Administrador de arranque de Windows
----------------------------------
Identificador           {bootmgr}
device                  partition=\Device\HarddiskVolume3
path                    \efi\microsoft\boot\bootmgfw.efi
description             Windows Boot Manager
locale                  es-ES
inherit                 {globalsettings}
default                 {current}
resumeobject            {6c4efd50-1477-11ef-96e4-a405a135b237}
displayorder            {current}
toolsdisplayorder       {memdiag}
timeout                 30

[...]

But it should be on Volume0!:

C:\Windows\System32>diskpart

Microsoft DiskPart versión 10.0.26100.1150

Copyright (C) Microsoft Corporation.
En el equipo: DESKTOP-R8PPA8R

DISKPART> list volume

  Núm Volumen Ltr  Etiqueta     Fs     Tipo        Tamaño   Estado     Info
  ----------- ---  -----------  -----  ----------  -------  ---------  --------
  Volume 0         SYSTEM       FAT32  Partición    512 MB  Correcto   Oculto
  Volume 1     C                NTFS   Partición    222 GB  Correcto   Arranque
  Volume 2                      NTFS   Partición    675 MB  Correcto   Oculto
  Volume 3     D   Steam        NTFS   Partición    931 GB  Correcto

If I try using bcdedit to point the boot manager to Volume0, it refuses, stating "Incompatible request":

C:\Windows\System32>bcdedit /set {bootmgr} device partition=\Device\HarddiskVolume0
Error al establecer los datos del elemento.
Solicitud no compatible.

Anyway I managed to set it by assigning Volume 0 a driver letter using diskpart, and then using bcdedit to set the boot path to that letter, but that did neither work, and on the next Windows boot, the variable was reset to Volume3. So I am out of ideas.

Any suggestion other than deleting Windows?

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#2 2024-12-26 11:16:19

cryptearth
Member
Registered: 2024-02-03
Posts: 1,223

Re: Windows 11 24H2 deletes grub EFI entry on every boot

couple of possibilities:
as you have several drives - do you have multiple ESP or do you use just one ESP for everything?
how do you boot windows? do you chain it from grub or directly via boot selection from uefi?
what gpt guid is/are the ESP? on linux run 

lsblk -f -o +PARTTYPE

how do you recreate the grub entry? do you reinstall grub completely or do you run efibootmgr by hand?

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#3 2024-12-26 15:43:42

doragasu
Member
Registered: 2012-03-03
Posts: 159

Re: Windows 11 24H2 deletes grub EFI entry on every boot

cryptearth wrote:

couple of possibilities:
as you have several drives - do you have multiple ESP or do you use just one ESP for everything?

Single ESP. BTW in my previous post I wrote that I suspect Windows is confused and tries to use Volume3 as boot volume, but that is on a disk with a single partition and no EFI files is copied there.

cryptearth wrote:

how do you boot windows? do you chain it from grub or directly via boot selection from uefi?

Tried both approaches, same result, as soon as I boot Windows, the Grub entry is deleted, no matter if I boot from Grub chainloading or directly from the UEFI firmware menu.

cryptearth wrote:

what gpt guid is/are the ESP? on linux run 

lsblk -f -o +PARTTYPE

I cannot use the machine right now, will post this later.

cryptearth wrote:

how do you recreate the grub entry? do you reinstall grub completely or do you run efibootmgr by hand?

I do a full reinstall: boot from the arch install medium, mount partitions (root, boot, home), perform the arch-chroot, and from inside the chroot run:

# grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id=Linux
# grub-mkconfig -o /boot/grub/grub.cfg

I suppose the grub-mkconfig is not needed, but doesn't hurt AFAIK.

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#4 2024-12-27 09:55:21

doragasu
Member
Registered: 2012-03-03
Posts: 159

Re: Windows 11 24H2 deletes grub EFI entry on every boot

The lsblk:

jalon ~ $ lsblk -f -o +PARTTYPE
NAME        FSTYPE FSVER LABEL  UUID                                 FSAVAIL FSUSE% MOUNTPOINTS PARTTYPE
sda                                                                                             
├─sda2      vfat   FAT32 SYSTEM 1237-E36C                             278,3M    45% /boot       c12a7328-f81f-11d2-ba4b-00a0c93ec93b
├─sda5      ext4   1.0          0f0cd336-8c57-4cd4-8264-dfe43c8b4824   12,3G    79% /           0fc63daf-8483-4772-8e79-3d69d8477de4
└─sda6      ext4   1.0          f14d9e38-78ee-4494-8ba8-c564a34a3591  108,7G    66% /home       0fc63daf-8483-4772-8e79-3d69d8477de4
sdb                                                                                             
├─sdb1                                                                                          e3c9e316-0b5c-4db8-817d-f92df00215ae
├─sdb2      ntfs                3270E75870E720F9                                                ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
└─sdb3      ntfs                5CD2AC0FD2ABEC08                                                de94bba4-06d1-4d40-a16a-bfd50179d6ac
nvme0n1                                                                                         
├─nvme0n1p1                                                                                     e3c9e316-0b5c-4db8-817d-f92df00215ae
└─nvme0n1p2 ntfs         Steam  5E947A3D947A17AB                                                ebd0a0a2-b9e5-4433-87c0-68b6b72699c7

Linux is installed on sda, Windows on sdb, and there's also nvme0n1 that is shared for Windows and Linux and has mostly Steam games.

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#5 2024-12-27 11:13:48

cryptearth
Member
Registered: 2024-02-03
Posts: 1,223

Re: Windows 11 24H2 deletes grub EFI entry on every boot

so with only one esp on the linux drive it make sense that windows sees it as a different drive number - because same as with windows drive specifiers are not fixed: on linux sda and sdb can swap at every boot
on windows the drive numbers can be different at each boot (the only guaranteed is that the system drive will be drive letter C)
a possible issue could be that you boot across drive boundaries - but both grub and windows should be able to deal with that
please post the outout of

efibootmgr -vu

after installing grub with working boot entry and again after "removed" entry after windows boot - I'm curious if the boot entry gets deleted or just reordered

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#6 2024-12-27 13:25:07

doragasu
Member
Registered: 2012-03-03
Posts: 159

Re: Windows 11 24H2 deletes grub EFI entry on every boot

I suppose the '-u' switch above is a typo (at least my efibootmgr complains when I put it), so this is with only '-v':

jalon ~ $ efibootmgr -v
BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0000,0001
Boot0000* Linux	HD(2,GPT,370bee85-c904-432b-925b-97a2fd4b41ce,0x800,0x100000)/\EFI\LINUX\GRUBX64.EFI
      dp: 04 01 2a 00 02 00 00 00 00 08 00 00 00 00 00 00 00 00 10 00 00 00 00 00 85 ee 0b 37 04 c9 2b 43 92 5b 97 a2 fd 4b 41 ce 02 02 / 04 04 32 00 5c 00 45 00 46 00 49 00 5c 00 4c 00 49 00 4e 00 55 00 58 00 5c 00 47 00 52 00 55 00 42 00 58 00 36 00 34 00 2e 00 45 00 46 00 49 00 00 00 / 7f ff 04 00
Boot0001* Windows Boot Manager	HD(2,GPT,370bee85-c904-432b-925b-97a2fd4b41ce,0x800,0x100000)/\EFI\MICROSOFT\BOOT\BOOTMGFW.EFI0000424f
      dp: 04 01 2a 00 02 00 00 00 00 08 00 00 00 00 00 00 00 00 10 00 00 00 00 00 85 ee 0b 37 04 c9 2b 43 92 5b 97 a2 fd 4b 41 ce 02 02 / 04 04 46 00 5c 00 45 00 46 00 49 00 5c 00 4d 00 49 00 43 00 52 00 4f 00 53 00 4f 00 46 00 54 00 5c 00 42 00 4f 00 4f 00 54 00 5c 00 42 00 4f 00 4f 00 54 00 4d 00 47 00 46 00 57 00 2e 00 45 00 46 00 49 00 00 00 / 7f ff 04 00
    data: 00 00 42 4f

And this is after Windows removes the grub entry (note the two "Lexar USB..." are from the Ventoy stick I use to boot Arch install medium):

BootCurrent: 0003
Timeout: 1 seconds
BootOrder: 0001,0002,0003
Boot0001* Windows Boot Manager	HD(2,GPT,370bee85-c904-432b-925b-97a2fd4b41ce,0x800,0x100000)/\EFI\Microsoft\Boot\bootmgfw.efi0000424f
      dp: 04 01 2a 00 02 00 00 00 00 08 00 00 00 00 00 00 00 00 10 00 00 00 00 00 85 ee 0b 37 04 c9 2b 43 92 5b 97 a2 fd 4b 41 ce 02 02 / 04 04 46 00 5c 00 45 00 46 00 49 00 5c 00 4d 00 69 00 63 00 72 00 6f 00 73 00 6f 00 66 00 74 00 5c 00 42 00 6f 00 6f 00 74 00 5c 00 62 00 6f 00 6f 00 74 00 6d 00 67 00 66 00 77 00 2e 00 65 00 66 00 69 00 00 00 / 7f ff 04 00
    data: 00 00 42 4f
Boot0002* UEFI: Lexar USB Flash Drive 3.00, Partition 1	PciRoot(0x0)/Pci(0x1,0x2)/Pci(0x0,0x0)/Pci(0x8,0x0)/Pci(0x0,0x3)/USB(1,0)/HD(1,MBR,0xc0eee9e6,0x800,0x732b800)0000424f
      dp: 02 01 0c 00 d0 41 03 0a 00 00 00 00 / 01 01 06 00 02 01 / 01 01 06 00 00 00 / 01 01 06 00 00 08 / 01 01 06 00 03 00 / 03 05 06 00 01 00 / 04 01 2a 00 01 00 00 00 00 08 00 00 00 00 00 00 00 b8 32 07 00 00 00 00 e6 e9 ee c0 00 00 00 00 00 00 00 00 00 00 00 00 01 01 / 7f ff 04 00
    data: 00 00 42 4f
Boot0003* UEFI: Lexar USB Flash Drive 3.00, Partition 2	PciRoot(0x0)/Pci(0x1,0x2)/Pci(0x0,0x0)/Pci(0x8,0x0)/Pci(0x0,0x3)/USB(1,0)/HD(2,MBR,0xc0eee9e6,0x732c000,0x10000)0000424f
      dp: 02 01 0c 00 d0 41 03 0a 00 00 00 00 / 01 01 06 00 02 01 / 01 01 06 00 00 00 / 01 01 06 00 00 08 / 01 01 06 00 03 00 / 03 05 06 00 01 00 / 04 01 2a 00 02 00 00 00 00 c0 32 07 00 00 00 00 00 00 01 00 00 00 00 00 e6 e9 ee c0 00 00 00 00 00 00 00 00 00 00 00 00 01 01 / 7f ff 04 00
    data: 00 00 42 4f

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#7 2024-12-27 13:37:12

Scimmia
Fellow
Registered: 2012-09-01
Posts: 12,323

Re: Windows 11 24H2 deletes grub EFI entry on every boot

No, -u was not a typo, and -v is now default, so efibootmgr -u is what they were wanting, but the info is there anyway, so no need to repost.

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#8 2024-12-27 13:56:35

cryptearth
Member
Registered: 2024-02-03
Posts: 1,223

Re: Windows 11 24H2 deletes grub EFI entry on every boot

I have arch and win10 on the same drive with a shared esp and chain windows from grub
and although windows keeps re-adding itself to both the boot entries as well as the fallback path ESP/efi/boot/bootx64.efi it does not touch the grub entry
a possible idea that forms in my head: as you use a shared esp but across multiple drives it could be that either some stuff during early boot or later at userland modifies some settings - but its hard to tell if its windows doing that or something within the uefi implementation
from the given layout there seem no easy way to add an esp to the windows drive without dealing with partition and filesystem resizing

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#9 2024-12-27 17:19:53

doragasu
Member
Registered: 2012-03-03
Posts: 159

Re: Windows 11 24H2 deletes grub EFI entry on every boot

This is quite frustrating, because this setup has been working for years (until the 24H2 update), and none of the solutions I have seen in many post with the same or similar issue work.

About if it is Windows or something in the UEFI implementation, it is in fact hard to know for sure, but as this has been triggered by a Windows update...

BTW in case it helps, the motherboard is an Asus Prime X570-P

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