Again, it helps to save and restart or disconnect/reconnect the display to test these adjustments. To move the image up, increase the vertical front porch and decrease the back porch, to move it down, decrease the front porch and increase the back porch. To move the image to the right, decrease the horizontal front porch and increase the horizontal back porch to move it to the left increase the front porch and decrease the back porch. The horizontal "front porch" is the right edge of the screen (not the left as you might expect) the vertical "front porch" is the bottom edge of the screen. Remember to click "OK" (and not "Cancel") in the Timing Parameters window, then "Apply" in the main window, before you do this, or before you reboot. Note that you may not actually need to restart the computer: I found that I could just unplug the HDMI cable from the back of my display and plug it back in, and the new settings would take effect. It helps to work incrementally (say, by multiples of 8) and save and test your work as you go along. If you need to increase it, do the opposite. If you need to shrink the visible area, decrease the Active value and increase the front or back porch values by the same amount. It'd make life easier if that were built into SwitchResX, but anyway: You can get an idea of the adjustments you need to make if you use Displa圜onfigX to display an "Image Size Test" (in the "Test Screen" tab). This is the trial-and-error portion of the task, and is also slightly counterintuitive. Adjust the values to fit your display (heh). If you have changed your active, porch, or sync width values and the scan rates don't add up, you won't get any picture. With a constant pixel clock value and constant totals of Active + Blanking in both axes, the scan rates should also remain constant. This is a very important concept to understand. The horizontal and vertical scan rates are calculated using those total values and the pixel clock value. Blanking)), and the vertical line values must add up to 1124 (2 * (540 (V. To stick with my display, the horizontal pixel values must add up to 2200 (1920 (H. At a given resolution, the number of horizontal pixels and the number of vertical lines in each box always have to add to the same totals, and you can get those values by adding the "Active" and "Blanking" values in the Monitor Timing Block. The thing to realize as you get started is that all the numbers interact with each other, and as you change one value the application will recalculate the others if they're affected by the change. Start by entering the values in the Monitor Description Block you exported and opened in a text editor. Select "Custom" in the menu at the top (as opposed to "Scaled"). Click the "+" button to create a new resolution. Click on the "Custom" tab in the SwitchResX Control app. Search and/or ask on this forum, and also try Google.ĥ. If you don't have a picture at all, the values provided by your display are invalid, and you'll have to do some research to find valid values (I can't help you find them). If you have a picture and you just need to adjust its position and/or size, you have the easier task and these instructions can help you. The next step depends on what problem you need to solve. If yours looks like it's half what it should be, you'll have to double it below. I'm not sure why the vertical resolution is half what it should be there, but that's an important detail to note. * Positive horizontal polarityNote that the Mode is described as 1920 x 540 60Hz, interlaced. You should see at least one Monitor Description Block (mine has two, labeled Descriptor #0 and Descriptor #1). Using the text editor of your choice (TextEdit works, or you may have a preference for something else) open that file you just exported. Then click the "Export DDC" button and select a location to save the file.Ĥ. In the SwitchResX Control application, select the display you want to configure in the "Settings of:" menu (if it isn't selected already) and click the "Display" tab. Launch the SwitchResX Control application (if all you're doing is setting up a custom configuration, you don't need the preference pane and thus don't need APE either).ģ. Get the proper cable to connect your Mac to the display (VGI, DVI, or DVI->HDMI, depending on your display's inputs if you're using a portable Mac with only mini-DVI you'll need the adapter *and* a cable).Ģ. You can do it with only the external display (your big TV, that is), but it's tedious.ġ. All of this is easier to do if you have a portable Mac, since you can configure the external display while viewing everything on the built-in display.
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