This message was posted on behalf of Intel Corporation
Thank you for contacting Intel® technical support. I will be more than happy to help you.
I understand that you are having issues with custom resolution and your television connected via an Intel® HD Graphics 4000 controller.
Per your post, I suppose that you are using an HDMI® connection. Are you using any kind of adapters or splitters to connect the television?
What you can try in this case to confirm if the issue persists is to install the graphics driver provided by the computer manufacturer instead of the generic driver provided by Intel®. This suggestion is to be able to activate all the graphics features set by the manufacturer for your computer.
Please try with the driver from the manufacturer and let us know the results.