Description of problem:

I use identical grub configurations for UEFI installs of both RHEL7.2 and Fedora 23:

# cat /etc/default/grub 
GRUB_TIMEOUT=30
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL="console serial"
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
GRUB_CMDLINE_LINUX="intel_iommu=on iommu=pt console=ttyS0,115200n8"
GRUB_DISABLE_RECOVERY="true"
GRUB_DISABLE_OS_PROBER="true"

With fc23 this works as expected, I have grub I/O on both the graphics console and the serial port, with RHEL7.2 I only get output to the graphics console.

Version-Release number of selected component (if applicable):

Fedora:
grub2-efi-2.02-0.25.fc23.x86_64
grub2-tools-2.02-0.25.fc23.x86_64

RHEL7.2:
grub2-efi-2.02-0.34.el7_2.x86_64
grub2-tools-2.02-0.34.el7_2.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Install RHEL7.2 to a UEFI system with standard ttyS0/0x3f8 serial port
2. Attempt to configure grub2 output on both graphics and serial
3.

Actual results:
I/O only on graphics

Expected results:
Mirrored I/O on both outputs

Additional info:
Rebuilding the fc23 src.rpm on RHEL7.2 and installing the resulting rpms resolves the issue.