Satellite A660-1FM - Max. screen resolution of external monitor

Hi All,
This may be (probably) an easy questions to answer but I have a Satellite A660-1FM and want to use it with my Samsung Syncmaster (forgotten model) external screen. I grabbed an HDMI->DVI-D adapter, and all is well, but here is my question:
The toshiba specs page for my laptop (http://uk.computers.toshiba-europe.com/innovation/product/Satellite-A660-1FM/1096013/toshibaShop/false/) shows an external resolution capability of:
Max Resolution : 2,048 x 1,536
Max Refresh Rate : 100 Hz
Non-interlaced resolution with max refresh rate : 1,920 x 1,200
But I get what I call standard HDMI resolution (not surprising I guess) when connected HDMI->DVI-D to my external monitor. I have previously run this monitor on my desktop at much high resolutions than 1080P, so the monitor is capable.
Just wondered what I'm missing here, or is it a case of the graphics card spec is higher than is possible to output from the laptop ?
Thanks for any help
Andy

Hi,
Thanks for the reply.
As to native resolution of the external monitor - unsure how to find this - but it was running a with a lot higher res when it was connected to my old desktop (which has died and been replaced by this laptop)
R/E the adapter - My Samsung Syncmaster monitor has a DVI-D cable sticking out the back of it, so I needed to connect that to my laptop - either vga-> DVI-D or HDMI-DVI-D to make use of it.
The external monitor is currently running at 1680 x 1050 using the laptop HDMI output -> HDMI-DVI-D adapater -> external monitor.
Before my desktop died, using the same external monitor I was running at 1680 x (guessing a bit here) 2048 ish (really sure I had a greater y res, this 1050 lark is really squishy).. in any case, the Y resolution was much much much better than 1050.
But, according to the specification for this laptop, it can output 2048 x 1536 to an external device (How, the HDMI and VGA outptu cannot go that high right ?)
So, I'm trying to figure out how to get the resolution on the laptop spec onto my external monitior, which has more than handled this resolution before my old gaming desktop died.
Thanks again for the reply - I hope this makes my question clearer.
Cheers
Andy

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