3 Replies Latest reply on Feb 12, 2015 11:49 AM by Robert_U

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

    John_Aether

      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.)