DVI - HDMI Output resolution

I have an 26" HDTV with a resolution of 1366x768. I would assume that the mbp 256mb graphics card should easily be able to output this. Unfortunately I have only been able to output at 1344x756 interlaced. Im using a DVI-HDMI cable to hook up the two. Does anyone have any suggestions on how to get my mbp to output at 1366x768? Thanks in advance.

Generally speaking, a Mac outputs video to an external display exactly according to what it is told to by the display. When a Mac is connected to a display, there is a "handshake" that takes place over a data line imbedded in the video cable and driver data, called EDID, is passed from the display to the Mac from which the Mac builds the required resolution "on-the-fly." If your MBP is sending 1344x756 to the TV, then that is likely what is being asked of it.
You can confirm if that is in fact true by installing SwitchRes X (I recommend SwitchRes X Control Panel over the full version of SwtichRes X) and clicking on the "Export DDC" button in the main SRX "Display" pane. The resulting text file is a dump of the driver data inside your TV and it will contain detailed timing under a heading Descriptor #0 that will show the first requested timing. Probably you will find it is 1344 x 756 interlaced.
If you want, you can try and build a custom native timing for your display. But then you face the question, why didn't the manufacturer do this in the first place? The answer to that question could be that the display won't run from a timing equal to the panel's native format. All I can say to that point is that manufacturers of TVs treat them differently when compared with their computer monitor brethren. It's possible that were you to build a custom, native timing, the TV might not work from it.
To build a custom timing, click on the Custom tab in SRX and then click on the "+" button to add a new timing. Type in 1366 for the Horizontal Active value and 768 for the Vertical Active value. Then click on the "Use simplified settings:" check box and in the associated pop-up select CVT. SRX will then fill in all the other boxes for you. Click OK and then follow the remaining istruction for saving and rebooting. Your new timing should then show up and become active and selectable. Good luck.

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