Problem with T400 and external monitor (1920x1200 resolution)

Hi there
My laptop:
ThinkPad T400 2767-C99* (graphics is: ATI Mobility Radeon HD 3470 256MB / X4500MHD (Switchable Graphics)), OS is WinXP
I just installed the newest video driver from the lenovo page (which also installs "ATI catalyst")
Externale Monitor:
I just bought a Samsung SyncMaster 2443FW, 24" TFT monitor with maximum resolution 1920x1200
Problem:
Monitor works great with my newer T400s and my old Acer laptop. However, with my T400 (described above), I can't make the monitor use the 1920x1200 resolution. However, all the other resolutions look ugly so I need it to work with 1920x120
- If i change the resolution by rightclicking on the Windows XP desktop (and then properties=>settings) and set the screen resolution there to 1920x1200, then my monitor only used a lower resoltion (1440x900) and I get a scrolling effect as I move my pointer across the screen
- if I use ATI catalyst software to set the resolution, I can only chose smaller resolutions (it does no go up to 1920x1200)
Questions
Is that a hardware (maybe the graphic card does not support 1920x1200) or a software problem (maybe some problem with the driver) or just a matter of setting?
What can I do?
Help would be very much appreaciated!
*Original description: Based 2767-2JG: T9550(2.66GHz), 4GB RAM, 250GB 5400rpm HD, 14.1in 1440x900 LCD, 256MB ATI Radeon 3470HD, CDRW/DVDRW, Intel 802.11agn wireless, Bluetooth, Modem, 1GB Ether, UltraNav, Sec Chip, FPR, Camera, 9c Li-Ion, DOS License
Solved!
Go to Solution.

bfrey wrote:
Thank you for your answer.
I have already installed the newsest drivers from Lenovo. I don't really see why I should install a non-official driver. I am convinced that it must work somehow with the official driver.
Kind regards
there are plenty of instances where the official driver have glitches... just look around the forum to find instances of which.... while official drivers maybe better in most instances, there are always the odd case where it doesn't work as well as it should. If they perfectly out of box, then there would never need to be multiple revisions and updates.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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