problems with external monitor

[krisha]

Hi there

I Have an IBM thikpad r50 with a radeon mobility 7500 graphicscard. Now i want to connect a samsung syncmaster 204Ts (1600 x 1200) to it via my docking bay. The problem is i cannot get the resolution above 1280 x 1024. Well i can, but then it kinda makes the desktop bigger that the screen, so i have to move the mouse to the corners to get it to move the desktop. Is there a fix for this? Ohh I use the DVI-connection.

[CJ3D]

Are you running the internal LCD at the same time as the external monitor? This would cause the resolution "extension" you mentioned.


Try just running the external monitor by itself and fiddling around with the output settings in Display Properties.

Also check the monitor adapter refresh rate in Display Properties->Settings->Advanced->Monitor. Try lowering it to something more standard such as 60 or 75Hz. I'm not sure what the limits are regarding DVI output (in terms of Radoen 7500 capabilities ), but a lower refresh rate should certainly relax the limits.

Many 'Mobility' gfx chipsets are limited in terms of resolution capabilities (especially 16:9 widescreen resolutions), so research/google the gfx chipset and determine what its actually capable of.

[krisha]

the thing is it works with the analog connector - we're gonna try a fresh windows/drives install monday and se if it fixes the problem.

This is taken from ati's homepage
Overview

Designed for exceptional 2D/3D/video performance and integrating 32 MB DDR memory, Mobility™ Radeon® 7500 is ideal for graphics-intense scenarios. It is pin compatible with Mobility™ Radeon® and future products, providing extended life for any motherboard design.

At-a-glance
Exceptional 2D/3D/video performance
32MB integrated video DDR memory, expandable to 64MB with external memory.
260MHz (at 1.5V) engine clock/ 183MHz memory clock
Pin compatible Mobility™ Radeon™ for easy transition without redesign leading to longer product cycles
Integrated Spread Spectrum for reduced EMI
Dual DAC for integrated, cost-effective multi-panel support
Integrated dual channel LVDS up to 85MHz per channel
Resolutions from VGA up to Q**A (2048x1536)
DVI compliant integrated 165MHz TMDS transmitter
Resolutions from VGA up to U**A (1600x1200)
Integrated high-resolution TV-out (up to 1024x768)
PCI and AGP Bus

[nm+]

most mobile gpus will not run any higher on a secondary screen than on the primary display (the notebook lcd). The only way to overcome this is to disable the primary lcd. You can do this at the driver level quite easily.

[krisha]

how would i do that nm+?