Changing the actual HDMI output resoloution

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Changing the actual HDMI output resoloution

I have a MacBook Pro connected to a Switcher/Scaler (Kramer VP-728) using HDMI which is then connected to a projector. Since upgrading to Mavericks the output is automatically set to 1920x1200, however I need the output to be 1024x768 (or any resoloution with a 4:3 aspect ratio). I can click "scaled" in display preferences while holding the option key and select that resoloution, however as the option says it is scaled - the output signal is still actually 1920x1200 and as a result I get blank lines down either side of the projector.

Does anybody know I way I can manually set the actual resoloution being output on HDMI?

MacBook Pro, OS X Mavericks (10.9)

Posted on Nov 12, 2013 1:23 PM

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mark48319 Author

Level 1

10 points

Apr 8, 2014 2:38 PM in response to mark48319

I have finally found the following soloution:

- Download and install SwitchResX from http://www.madrau.com

- Open system preferences, click SwitchResX and select your HDMI display

- Tick "Disable HDMI 1.3a"

- Close SwitchResX preferences and save the changes.

- Reboot the Mac for the change to take effect

- Open the SwitchResX settings again and select your display

- Click the "Current Resoloutions" tab

- You should now be able to choose a suitable resolotion (in my case 1024x768 @ 75Hz)

Hope this might help someone.

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