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My external display only has a 30HZ option...., what's up with that? How can I make it 60?

Running Juno 5.0 on MP late 2015

It just seems to work now, I guess an update was posted :?

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    Post your external display specs or model. Also, did you try setting it manually using xrandr?
    – Maccer ♦
    May 9 '19 at 12:22
  • thanks for teaching me this command
    – Haim Bender
    May 14 '19 at 13:41
  • No problem! If you write man xrandr it will explain how the command works.
    – Maccer ♦
    May 14 '19 at 14:05
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TLDR; Triple check that your cable supports 60Hz.

Having struggled with this issue for a while now, I would like to point out that it is not you, not the monitor, not Linux but very likely the cable. A few months ago, I have even brought a perfectly fine, brand new 4K monitor back to the store because I thought I could not use it (30Hz is just unacceptable if you are doing 3D work). I spent evenings messing with xrandr, all to no avail. The guy at the store ensured me the cable was fine, but as it turns out, it was not.

This morning, I received a new USB-c to HDMI cable that explicitly supports 60Hz (it even says so on the USB-c plug). Just plugged it in and the issue is fixed. Even the monitor's 2.2 Gamma is displayed more accurately; I had it set to 2.6 with the other cable to get any depth in the blacks. I am using a Dell XPS 13 9370 with a 27" 4K Philips monitor (276E8VJSB) and elementary OS 5.0 Juno.

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