stuck resolution 640x480

[ibnu]

 gallium 0.4 on llvmpipe (LLVM 3.5, 128 bits) i can not change my desktop resolution and stuck at 640x480

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic i686
.tmp.unity.support.test.1:

ApportVersion: 2.14.1-0ubuntu3.7
Architecture: i386
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Wed Sep 23 15:32:36 2015
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus: virtualbox-guest, 4.3.10, 3.16.0-30-generic, i686: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 Silicon Integrated Systems [SiS] 771/671 PCIE VGA Display Adapter [1039:6351] (rev 10) (prog-if 00 [VGA controller])
   Subsystem: CLEVO/KAPOK Computer Device [1558:0801]
InstallationDate: Installed on 2015-09-23 (0 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release i386 (20150218.1)
Lsusb:
 Bus 001 Device 002: ID 0bda:8189 Realtek Semiconductor Corp. RTL8187B Wireless 802.11g 54Mbps Network Adapter
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 003 Device 002: ID 046d:c52f Logitech, Inc. Unifying Receiver
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: clevo M7x0S
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-30-generic root=UUID=e2d9e4a4-8627-4223-ab53-4466b48fd5ba ro quiet splash vt.handoff=7
Renderer: Software
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/08/0892
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.asset.tag: 1234567890
dmi.board.name: M7x0S
dmi.board.vendor: clevo
dmi.board.version: Bottom
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: SiS
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd12/08/0892:svnclevo:pnM7x0S:pvrRev.A1:rvnclevo:rnM7x0S:rvrBottom:cvnSiS:ct1:cvrN/A:
dmi.product.name: M7x0S
dmi.product.version: Rev. A1
dmi.sys.vendor: clevo
version.compiz: compiz 1:0.9.11.3+14.04.20150122-0ubuntu1
version.libdrm2: libdrm2 2.4.65+git20150922.f3c6740f-0ubuntu0ricotz~trusty
version.libgl1-mesa-dri: libgl1-mesa-dri N/A
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Wed Sep 23 15:27:14 2015
xserver.configfile: /etc/X11/xorg.conf
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.16.0-1ubuntu1.2~trusty2