I tried to install dual-boot Fedora 42/Windows 11, now Windows 11 is not seen!

Ask Fedora
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1

I installed Windows 11 on my 512 GB SSD drive. That worked out fine. Then I installed Fedora 42 KDE Plasma 6 on my 1 TB SCSI drive, /nvme0n1. Now the machine (AMD-64) boots right into Fedora/KDE, without any pause from the grub menu. and no option to boot Windows.

I can mount the windows partition, which is on /dev/sda2, and see all the files. But I can’t boot into Windows. I read a similar topic on Ask Fedora, so if it helps, here is the output of
$ sudo efibootmgr

BootCurrent: 0000
Timeout: 2 seconds
BootOrder: 0000,0012,0013,0010,0011
Boot0000* Fedora        HD(1,GPT,8d0b020f-a39d-455e-967d-afe08d3fc2fd,0x800,0x12c000)/\EFI\FEDORA\SHIMX64.EFI
Boot0010* UEFI: IPv4 Realtek PCIe GBE Family Controller PciRoot(0x0)/Pci(0x1c,0x0)/Pci(0x0,0x0)/MAC(80e82cfeccce,0)/IPv4(0.0.0.0,0,DHCP,0.0.0.0,0.0.0.0,0.0.0.0)0000424f
Boot0011* UEFI: IPv6 Realtek PCIe GBE Family Controller PciRoot(0x0)/Pci(0x1c,0x0)/Pci(0x0,0x0)/MAC(80e82cfeccce,0)/IPv6([::],0,Static,[::],[::],64)0000424f
Boot0012* UEFI OS       HD(1,GPT,8d0b020f-a39d-455e-967d-afe08d3fc2fd,0x800,0x12c000)/\EFI\BOOT\BOOTX64.EFI
Boot0013* Fedora        HD(1,GPT,8d0b020f-a39d-455e-967d-afe08d3fc2fd,0x800,0x12c000)/\EFI\FEDORA\SHIM.EFI

The command “os-prober” produced no output, but terminated with an exit code of 0.

I went through the exercise of reinstalling Windows, which booted only Windows, then installing Fedora 42 again, and could then only boot Fedora (with no pause for a grub menu). Same result as originally.

It seems that when I installed Fedora 40, the installer recognized my pre-existing Windows installation. Any suggestions? I’d be glad to post command output from anything you suggest. My fedora partitions are as follows:

/dev/nvme0n1p3, subvol=root on / (btrfs)
/dev/nvme0n1p2 on /boot (ext4)
/dev/nvme0n1p1 on /boot/efi (vfat)
/dev/nvme0n1p3,subvol=home on /home (btrfs)

I installed using the the the regular anaconda installation program, using automatic partitioning.

Thanks for your help.

2

Can you run this command, to check what the default timeout for Grub is?

cat /etc/default/grub | grep GRUB_TIMEOUT

3

I ran the command, and the output was:
GRUB_TIMEOUT=10

4

I think the Windows EFI entry is missing.
I am not near a Dual boot system to check this.

Go into the BIOS and see if Windows is listed as a boot option.

If I am right you will need to repair the Windows 11 install.