Comment 29 for bug 1533258

Am having the same issue (dual boot, win10 and linux mint based on ubuntu 14.04).
Linux boots, but not win10.

Looks like bug was introduced with 2.02~beta2-9ubuntu1.7.diff.gz

Check here for the commit details:
http://launchpadlibrarian.net/230268356/grub2_2.02~beta2-9ubuntu1.6_2.02~beta2-9ubuntu1.7.diff.gz

Maybe the author of the affected 1.7 version (dann frazier) can help us - I added his e-mail to the subscriber list of this bug.

My details:

# find /boot/efi -ls | grep x64.efi

  14 117 -rwxr-xr-x 1 root root 119808 Jun 26 2015 /boot/efi/EFI/linuxmint/grubx64.efi
    20 1260 -rwxr-xr-x 1 root root 1289424 Apr 13 21:37 /boot/efi/EFI/ubuntu/shimx64.efi
    21 936 -rwxr-xr-x 1 root root 958328 Apr 13 21:37 /boot/efi/EFI/ubuntu/grubx64.efi
   404 1129 -rwxr-xr-x 1 root root 1155424 Jul 10 2015 /boot/efi/EFI/Boot/bkpbootx64.efi
   405 1324 -rwxr-xr-x 1 root root 1355736 Jul 31 2015 /boot/efi/EFI/Boot/bootx64.efi
   772 1129 -rwxr-xr-x 1 root root 1155424 Jul 31 2015 /boot/efi/boot-sav/log/2015-07-31__16h20boot-repair52/sdb2/bootx64.efi

# efibootmgr -v
BootCurrent: 0000
Timeout: 0 seconds
BootOrder: 2002,0000,0001,2001,2003
Boot0000* Windows Boot Manager HD(2,12c800,32000,c93e4576-8212-41d7-bf8b-539d15048fd9)File(\EFI\linuxmint\grubx64.efi)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}....................
Boot0001* Windows Boot Manager HD(2,12c800,32000,c93e4576-8212-41d7-bf8b-539d15048fd9)File(\EFI\Microsoft\Boot\bootmgfw.efi)RC
Boot0002* ATAPI CDROM: MATSHITA DVD-RAM UJ8HC ACPI(a0341d0,0)PCI(1f,2)03120a00010000000000CD-ROM(1,52b,15a515)RC
Boot0003* Unknown Device: HD(2,12c800,32000,c93e4576-8212-41d7-bf8b-539d15048fd9)File(\EFI\ubuntu\shimx64.efi)RC
Boot0004* ubuntu HD(2,12c800,32000,c93e4576-8212-41d7-bf8b-539d15048fd9)File(\EFI\ubuntu\shimx64.efi)
Boot2001* EFI USB Device RC
Boot2002* EFI DVD/CDROM RC
Boot2003* EFI Network RC