Description of problem:
spice rhel5.7 guest hang when do s3,but vnc work well

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

--host
rpm -qa | grep kvm
kmod-kvm-83-232.el5
kvm-qemu-img-83-232.el5
kvm-debuginfo-83-232.el5
kvm-83-232.el5
etherboot-zroms-kvm-5.4.4-15.el5
kmod-kvm-debug-83-232.el5

uname -r
2.6.18-259.el5

How reproducible:

Steps to Reproduce:
1./usr/libexec/qemu-kvm -no-hpet -usbdevice tablet -rtc-td-hack -name 57 -smp 2 -m 4G -uuid 9e6f04cf-2ad7-45aa-9333-2d2ee26570c6 -boot c -drive file=/usr/tools/rhel57.qcow2,if=ide,cache=none,boot=on,format=qcow2,werror=stop -net nic,vlan=1,macaddr=52:54:00:94:a3:8b,model=rtl8139 -net tap,vlan=1,script=/etc/qemu-ifup -notify all -balloon none -monitor stdio -spice disable-ticketing,port=5911 -qxl 1
2. connect to guest use spice
3. suspend to mem
# echo mem > /sys/power/state
4. attachment is screen snapshot
  
Actual results:
guest cannot suspend to s3, it will hang

Expected results:
guest suspend to s3 successful

Additional info:
use vnc connect to guest, guest suspend to s3 successful