How do I change my resolution to 1600*900 for a wide screen monitor in Oneiric?
My Hardware configuration is as below:

madhu@madhu-Home:~$ lspci

00:00.0 Host bridge: Silicon Integrated Systems [SiS] 671MX

00:01.0 PCI bridge: Silicon Integrated Systems [SiS] AGP Port (virtual PCI-to-PCI bridge)

00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS968 [MuTIOL Media IO] (rev 01)

00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev 01)

00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)

00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)

00:03.3 USB Controller: Silicon Integrated Systems [SiS] USB 2.0 Controller

00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] 191 Gigabit Ethernet Adapter (rev 02)

00:05.0 IDE interface: Silicon Integrated Systems [SiS] SATA Controller / IDE mode (rev 03)

00:06.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge

00:07.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge

00:0f.0 Audio device: Silicon Integrated Systems [SiS] Azalia Audio Controller

00:1f.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge

01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 771/671 PCIE VGA Display Adapter (rev 10)

madhu@madhu-Home:~$ cat /etc/X11/xorg.conf