My computer model is Dell Studio 1555: Pentium Dual Core T4300(2.1GHz,800MHz,1MB), 4096MB 800MHz DDR2 Dual Channel, 512 MB ATI Mobility RADEON HD 4570 using the ATI proprietary driver. My screen resolution is 1366x768 (16:9). This problem has been identified on Ubuntu 11.10 and 12.04
I recently acquired an LG - L203WT monitor but I've found that I can't get the maximum resolution out of it - 1680x1050, which is 16:10 ratio.
The settings in Display show the maximum resolution I can achieve as 1440x900
This is also shown in AMD Catalyst Control Centre
The resolution has to be be 16:10 ratio for it to work, so choosing a 16:9 resolution doesn't work.
As I'm using the proprietary driver using xrandr wont work, so is there any other way to get the maximum resolution of 1680x1050 with the fglrx driver?
It is likely that the reason you cannot achieve this resolution on the external monitor is because the card does not support it.
Most graphics cards only support a certain number of possible resolutions and combinations, so with two monitors, the card probably cannot push the resolution you are trying to achieve. It is also possible that this is a driver related issue, as proprietary drivers normally limit the resolution options to something that is safe for the card.
You might be able to achieve a lower resolution that works with your monitor (such as 1400x1050), but not the maximum supported by the monitor.
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