Description:
QEMU cause X11 error when adjust resolution in full screen mode or start QEMU with "-full-screen".

Additional info:
* package version(s)
qemu:1.7.0-1
cinnamon:2.0.14-1
sdl:1.2.15-5

* error output in Xterm
X Error of failed request: BadValue (integer parameter out of range for operation)
Major opcode of failed request: 151 (XFree86-VidModeExtension)
Minor opcode of failed request: 10 (XF86VidModeSwitchToMode)
Value in failed request: 0x2c2
Serial number of failed request: 446
Current serial number in output stream: 448

* gest OS infomation
Windows XP SP3 32bit

Steps to reproduce:
1.Start QEMU with the command:
qemu-system-i386 -enable-kvm -machine pc,accel=kvm -cpu Opteron_G2 -smp 2 -nodefaults -rtc base=localtime -usbdevice tablet -m 1G -vga std -soundhw ac97 -net nic,model=virtio -net bridge,br=br0 -boot order=dc -drive if=virtio,index=0,media=disk,format=raw,file=/home/gkj/VM/WinXP.img
2.Press ctl + alt + f to full screen.
3.Adjust resolution in guest OS.
or
1.Make sure the guest OS resolution is not the same as host OS.
2.Start QEMU with parameter "-full-screen".