Screen resolution 1336x768 not possible on ASUS EeePC 1011HA (Seashell)

[Doodles]

I installed Ubuntu 9.10 32-bit today on my ASUS EeePC 1011HA (Seashell) Netbook. It's native screen resolution is 1336x768, however, the maximum resolution I can choose is 1024x768.

ProblemType: Bug
Architecture: i386
CheckboxCommand: resolution_test
CheckboxDescription:
 Die Anzeige verwendet folgende Auflösung:

 $output

 Ist dies akzeptabel für Ihre Anzeige?
CheckboxTest: resolution
Date: Mon Nov 9 17:47:34 2009
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
MachineType: ASUSTeK Computer INC. 1101HA
Package: xorg 1:7.4+3ubuntu7
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-14-generic root=UUID=ab5fff9d-f75f-4a00-8c3b-17c93f8ca790 ro quiet splash
ProcEnviron:
 SHELL=/bin/bash
 LANG=de_DE.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
 xserver-xorg 1:7.4+3ubuntu7
 libgl1-mesa-glx 7.6.0-1ubuntu4
 libdrm2 2.4.14-1ubuntu1
 xserver-xorg-video-intel 2:2.9.0-1ubuntu2
 xserver-xorg-video-ati 1:6.12.99+git20090929.7968e1fb-0ubuntu1
SourcePackage: xorg
Tags: checkbox-bug
Uname: Linux 2.6.31-14-generic i686
XorgConf: Error: [Errno 2] No such file or directory: '/etc/X11/xorg.conf'
XsessionErrors:
 (gnome-settings-daemon:1439): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (gnome-settings-daemon:1439): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (nautilus:1497): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (polkit-gnome-authentication-agent-1:1516): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (gnome-appearance-properties:1924): Gdk-CRITICAL **: gdk_display_sync: assertion `GDK_IS_DISPLAY (display)' failed
dmi.bios.date: 09/24/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0317
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: 1101HA
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: x.xx
dmi.chassis.asset.tag: 0x00000000
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTek Computer INC.
dmi.chassis.version: x.x
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0317:bd09/24/2009:svnASUSTeKComputerINC.:pn1101HA:pvrx.x:rvnASUSTeKComputerINC.:rn1101HA:rvrx.xx:cvnASUSTekComputerINC.:ct10:cvrx.x:
dmi.product.name: 1101HA
dmi.product.version: x.x
dmi.sys.vendor: ASUSTeK Computer INC.
fglrx: Not loaded
system:
 distro: Ubuntu
 architecture: i686kernel: 2.6.31-14-generic