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7 Posts

10-06-2020

Canada

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Stuck at 30hz

2021-03-22, 17:10 PM

I have an E15 at work which according to Lenovos site says can do 4k@60hz over USB C (but not HDMI). Its connected to a Lenovo Gen 2 USB C dock which also says it can do 4K@60hz. I got a new 4K monitor today and it wont let me increase beyond 30hz. Whats the issue here? I'm using a dp-dp cable which shouldn't be an issue, HDMI wasn't any different. 

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612 Posts

06-26-2016

Germany

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Re:Stuck at 30hz

2021-03-22, 19:15 PM

the E15 seems to be a DP1.2 system. Using a USB-C dock limits the maximal supported resolution to 4k @ 30Hz.

This document  shows the supported resolutions for the USB-C gen2 dock

 

HP laptops do have a BIOS option to enable "high Display Resolutions" in such setups, limiting USB transfers to USB2 speeds  but enabling the full DP data rate.

 

Tech-Savvyness does not replace reading the fine manual.
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