Description of problem:
Resolution cannot be adjust above 1600x900 after turning on "RHEV Spice Agent" service in windows 10.

Version-Release number of selected component (if applicable):
kernel:2.6.32-593.el6.x86_64
qemu:qemu-kvm-0.12.1.2-2.482.el6.x86_64
rhev spice agent windows:rhev-spice-agent-msi-4.13-1
vdagent win: vdagent-win-3.6-2

How reproducible:


Steps to Reproduce:
1.Boot guest with cmd:
qemu-kvm -name win10x64 -m 8G -machine pc,accel=kvm -cpu SandyBridge -smp 8 -name win10 -uuid 990ea161-6b67-47b2-b803-19fb01d30d12 -serial unix:/tmp/m,server,nowait -vga qxl -spice port=5900,disable-ticketing -device virtio-serial-pci,id=virtio-serial1 -chardev spicevmc,id=charchannel0,name=vdagent -device virtserialport,bus=virtio-serial1.0,nr=3,chardev=charchannel0,id=channel0,name=com.redhat.spice.0 -cdrom /usr/share/virtio-win/virtio-win-1.7.5.iso -drive file=/home/storage/win10-1.qcow2,if=none,id=drive-scsi-disk0,format=qcow2,cache=none,werror=stop,rerror=stop -device virtio-scsi-pci,id=scsi0 -device scsi-hd,drive=drive-scsi-disk0,bus=scsi0.0,scsi-id=0,lun=0,id=scsi-disk0,bootindex=1 -monitor stdio
2.Connect guest with remote-viewer spice://you_host_ip:5900
3.Download rhev-spice-agent-msi-4.13-1 and vdagent-win-3.6-2, install rhev-spice-agent-msi-4.13-1.msi, extract vdagent-win-3.6-2.zip to a folder, goto this folder and execute "vdservice install" from power shell, not start vdservice.
4.Start "RHEV Spice Agent" service and try to change resolution over 1600x900, eg change resolution to 1600x1200.

Actual results:
Resolution will switch to 1600x1200 and back switch to 1600x900.

Expected results:
Resolution can be adjusted over 1600x900.

Additional info:
Resolution can be freely adjusted to lower than 1600x900. Also no such issue happen after turning off "RHEV Spice Agent" service.
File this bz against spice first, free to update to right component if any mistakes