Hi gurus,
How can I configure my Thinkpad T30 to display 1024x768 pixels of screen resolution?
current display is only 800x600

You need to give more details.
Are you using
1. GNOME OR KDE? or something else?
2. Which Linux distribution and what's your maximum resolution?

GNOME
RHEL 4
maximum resolution i can select is 800x600

Post;
cat /etc/X11/xorg.conf | grep Driver
and
cat /etc/X11/xorg.conf | grep Modes
also
lspci <--- may need to be root for that

[root@localhost ~]# cat /etc/X11/x
xdm/ xinit/ xkb/ xorg.conf xserver/ xsm/
[root@localhost ~]# cat /etc/X11/xorg.conf | grep Driver
Driver "kbd"
Driver "mouse"
Driver "radeon"
[root@localhost ~]# cat /etc/X11/xorg.conf | grep Modes
Modes "800x600" "640x480"
Modes "800x600" "640x480"


[root@localhost ~]# lspci
00:00.0 Host bridge: Intel Corp. 82845 845 (Brookdale) Chipset Host Bridge (rev 04)
00:01.0 PCI bridge: Intel Corp. 82845 845 (Brookdale) Chipset AGP Bridge (rev 04)
00:1d.0 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #1) (rev 02)
00:1d.1 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #2) (rev 02)
00:1d.2 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #3) (rev 02)
00:1e.0 PCI bridge: Intel Corp. 82801 Mobile PCI Bridge (rev 42)
00:1f.0 ISA bridge: Intel Corp. 82801CAM ISA Bridge (LPC) (rev 02)
00:1f.1 IDE interface: Intel Corp. 82801CAM IDE U100 (rev 02)
00:1f.3 SMBus: Intel Corp. 82801CA/CAM SMBus Controller (rev 02)
00:1f.5 Multimedia audio controller: Intel Corp. 82801CA/CAM AC'97 Audio Controller (rev 02)
00:1f.6 Modem: Intel Corp. 82801CA/CAM AC'97 Modem Controller (rev 02)
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500]
02:00.0 CardBus bridge: Texas Instruments PCI1520 PC card Cardbus Controller (rev 01)
02:00.1 CardBus bridge: Texas Instruments PCI1520 PC card Cardbus Controller (rev 01)
02:08.0 Ethernet controller: Intel Corp. 82801CAM (ICH3) PRO/100 VE (LOM) Ethernet Controller (rev 42)

You should be able to just add it to the Modes.
I just use one;
Modes "1440x900"

Do i need to run any other commands after putting Modes "1440x900" ? the display are all in a mess

Your mode would be
Modes "1024x768"

Modes "1024x768", also display are all in a mess

Did it change? Did you restart X.?
have a look at;
/var/log/Xorg.0.log

now the startup screen is "1024x768", but at logging into my profile its still "800x600". Although display settings says its "1024x768"

can you post the output of
$ xrandr
$ cat /etc/X11/xorg.conf

If you are using KDE you can use $ krandrtray to change the resolution.

SZ: Pixels Physical Refresh
0 1024 x 768 ( 347mm x 260mm ) 60
*1 800 x 600 ( 347mm x 260mm ) *60
2 640 x 480 ( 347mm x 260mm ) 60
3 640 x 350 ( 347mm x 260mm ) 60
4 640 x 400 ( 347mm x 260mm ) 60
5 720 x 400 ( 347mm x 260mm ) 60
6 832 x 624 ( 347mm x 260mm ) 60
Current rotation - normal
Current reflection - none
Rotations possible - normal
Reflections possible - none


Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "yes"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "LCD Panel 1024x768"
HorizSync 31.5 - 48.5
VertRefresh 40.0 - 70.0
Option "dpms"
EndSection

Section "Device"
Identifier "Videocard0"
Driver "radeon"
VendorName "Videocard vendor"
BoardName "ATI Radeon Mobility 7500"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 16
Modes "800x600" "640x480" "1440x900"
EndSubSection
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection

Section "DRI"
Group 0
Mode 0666
EndSection

A couple of suggestions. You can eliminate any modes you don't intend to use from xorg.conf. For example, delete "800x600" "640x480". If the "800x600" mode is unavailable, you probably won't see it anymore.

If your screen is still messy in the "1024x768" mode, see if you can't use the monitor adjustments to clean it up. It is unlikely that 60 Hz won't work for your display, but you can always check your monitor information and make sure it is correct in xorg.conf.

Rob

it says "1024x768" now, but don't know why the icons and taskbar are still the same size