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Unable to achieve documented refresh rates when connecting (TV/Monitor) to my Intel HD 4000 (i7-3840QM)

JAeth
Beginner
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When I connect my laptop (Clevo NP150EM), (GPU: GTX 680M) (CPU: Intel Core i7-3840QM @ 2.80GHz) to my Seiki 39 inch 4K TV (SE39UY04) I am restricted to 95Hz@1920x1080, 55Hz@2560x1440, 31Hz@3200x1800, and 25Hz@3840x2160. Out of box the TV describes itself as being able to run at 120Hz@1920x1080, and 30Hz@3840x2160. Even under the Intel custom resolutions utility I am unable to run the resolutions at these refresh rates, an indicator window suggests that the possible bandwidth would be exceeded. I have an HDMI 1.4 cable connecting the Laptop to the TV, I am also able to use a DP1.2 to miniDP1.2 adapter into an active (4k@30Hz supported) miniDP1.2 to HDMI2.0 adapter. Why am I unable to achieve these refresh rates? Additional issue: At any refresh rate above 60Hz@1920x1080 there is a stutter and a frame skip that is rather jarring on the eyes. I have contacted Seiki and they provide that the issue is not on the TV end. What can I do?

Notes:

I am aware that my display sources are soldered to the integrated card, thus I am unable to run them off of the Nvidia card.

I have in fact seen other users of the SE39UY04 run the TV using similar hardware at 120Hz@1920x1080 and 30Hz@3840x2160 with NO frame stutter.

My Intel drivers and Nvidia drivers are up to date, as is the Seiki TV firmware.

Intel cards do not offer EDID support, thus I am unable to use a CRU to force refresh rates above what the Intel CRU is limiting me to.

It is not a pixel clock issue, I have patched my pixel clock already.

I have NOT tried to overclock the Intel processor in hopes of achieving the desired results. I wanted to leave this as a last ditch effort considering how small I figured the gains would be.

Possible questions:

Is it possible that the Clevo NP150EM (2012) was made with HDMI 1.2 connections?

Would the above situation affect the DisplayPort issue? Don't all DPs since the beginning of time support up to 60Hz at 4K (considering the native 20 pin architecture?) Or would DPs from 2012 and before be restricted as HDMI 1.4 was/is?

Is the CPU/Integrated card even powerful enough to run 4K @ 30Hz? (It seems fine at 25Hz aside from the frame stutter.)

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Allan_J_Intel1
Employee
1,071 Views

Thanks for joining the Intel community.

The graphics controller integrated on the i7-3840QM is Intel® HD Graphics 4000, this graphics controller does not support 4k screen resolutions, the highest resolution you would get through Display Port is 2560*1600, this information is available here:

https://software.intel.com/en-us/articles/3rd-gen-hd-graphics-quick-reference-guide 3rd Gen HD Graphics Quick Reference Guide | Intel® Developer Zone

Additionally, when using HDMI on Intel® HD Graphics 4000, the maximum resolution is 1920x1080 at 60 Hz .

Below you will find information about graphics controller supporting 4k:

https://software.intel.com/en-us/articles/quick-reference-guide-to-intel-processor-graphics https://software.intel.com/en-us/articles/quick-reference-guide-to-intel-processor-graphics

Allan.

JAeth
Beginner
1,071 Views

Wow Allan, I am so terribly surprised at how WRONG you are on so many levels.

First of all, I can PNP my monitor at 95Hz@1920x1080, 55Hz@2560x1440, and 25Hz@3840x2160. So you are horribly off base.

SECONDLY!!!!!! That guide lists the HD 4000 as being able to support 60Hz@2560x1600 using DisplayPort, but I am only getting 55Hz at a lower resolution, so SOMETHING IS OFF.

How about you actually address my issue rather than showing how little you understand about the problem by simply redirecting me to a reference guide.

This is actually really insulting. I provided more than enough information to at least produce a healthy guess at what may be the issue, but instead you tell me that I am off of my rocker.

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ROBERT_U_Intel
Employee
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Hi John

Allan is correct that the Ivybridge QM Processors graphics will only support up to 1920x1080 at 60 Hz via HDMI. The max HDMI pixel clock on Intel Core i7-3840QM is 225Hz and it is the gating spec on maximum resolution (Xx/Hz/bpp). On DP and eDP, the Intel Core i7-3840QM pixel clock is 360Hz which enables a max resolution on DP/eDP of 2880x1800 @ 60/24 Hz, 3840x2160 @ 30/24 Hz, and 4096x2160 @ 30/24 Hz.

On the QM processors you can run 4K at 30Hz via DP/eDp only, HDMI maximum is 1920x1080 60Hz. Additionally your Clevo system is an Hybrid Graphics system as you point out, with an NVidia GTX680m GPU. However, I do not know what the supported resolutions of the GTX680m are. Because it is an Hybrid Graphics system, it is a bit more difficult to determine what is supported and when on your system. Have you contacted Clevo by any chance to see if they have a more detailed specification on what is supported ?

Clarification, this guide is for Haswell and Broadwell based graphics, not Ivybridge. https://software.intel.com/en-us/articles/quick-reference-guide-to-intel-processor-graphics Quick Reference Guide for Intel® Core™ Processor Graphics | Intel® Developer Zone

Thanks

Robert

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