Schenker XMG Neo 15 external screen lag

Discussion in 'Sager and Clevo' started by Robertjan88, Aug 3, 2018.

  1. Robertjan88

    Robertjan88 Notebook Geek

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    Good evening all!

    Last week I received my new Schenker Neo 15 which includes an 8750h 6 core CPU, 16GB DDR4 2666 memory, a Samsung 970 Pro SSD, a GTX1060 6GB as well as 1080p 144HZ IPS screen (no Gsync).

    When connecting an 1440p 60HZ external monitor using an HDMI cable and closing the lid of my laptop (allowing the 1440p monitor to be my main screen), Windows 10 Home 64bit suddenly becomes very laggy. Especially during scrolling.

    A restart fixes this issue immediately.
    If I connect the external monitor before booting my laptop I don't have any issues either.

    Why does this happen? Is this something that happens due to the switch from 144HZ to 60HZ?

    Please note that I am running the latest Nvidia drivers.

    Thanks!
     
  2. RampantGorilla

    RampantGorilla Notebook Deity

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    Try this:
    1) Plug your screen into your laptop and make sure that your screen is turned on.
    2) Type project into the program search bar and select "Project to a second screen"
    3) Select the "Second screen only" option

    upload_2018-8-4_2-1-31.png

    This will turn off your laptop screen and turn on your external monitor. DO NOT CLOSE THE LID OF YOUR LAPTOP!!!
     
  3. Robertjan88

    Robertjan88 Notebook Geek

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    Many thanks for your feedback! Will try this this morning. What is the difference between closing the lid and the above? :)
     
  4. Robertjan88

    Robertjan88 Notebook Geek

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    Just tried out the steps you described.
    Unfortunately, this doesn't fix my issue. As soon as I select "second screen only" my external display lags "A LOT".

    Only a restart fixes this issue.

    Remarkable is that the lag doesn't occur when I am using both screens...
     
  5. Robertjan88

    Robertjan88 Notebook Geek

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    Please find attached.

    Image 1. was taken before connecting my external display.
    Image 2. was taken after connecting my external display and closing the lid.
    Image 3. was taken after a restart with the lid remaining closed

    Something I am especially noticing is the little spikes on image 2
    The GTX 1060 seems to be switched off in image 1 when the external screen is not yet attached to the laptop 1. Before connecting my external screen.jpg 2. After closing the lid.jpg 3. After a restart with the lid closed.jpg
     
  6. RampantGorilla

    RampantGorilla Notebook Deity

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    That's because the HDMI port is directly connected to the GTX 1060 and not the iGPU. When you connect a monitor, the gtx 1060 needs to be switched on to drive the display. Most laptop seem to connect the HDMI port to the iGPU. Whenever you run a game or any 3D application, the GTX 1060 renders a frame, then passes that frame to the iGPU which in turn passes it on through the HDMI port to your external monitor. This is basically how Optimus works.

    First try to replicate the scenario where you get spikes in GPU usage. After that, open up task manager, go to the processes tab and click on the GPU usage tab so that it shows GPU usage in descending order, with the most GPU intensive processes at the top. Try to see if you can identify the process that is causing the spikes in GPU usage. Make sure that you have no programs open and that your system is idling.

    upload_2018-8-4_12-52-53.png
     
  7. Robertjan88

    Robertjan88 Notebook Geek

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    Many thanks for your feedback! Please find attached 2 images of my task manager.

    The first one (named "1. without scrolling") was made while the external display was connected through HDMI and "second screen only" was selected under the project menu.

    The second one (named "2. scrolling") was made under the same circumstances as the first one, however, I was scrolling through the "start" -> "All programs" menu.

    I also checked the taskbar without connecting the external display, however, the GPU tasks shown in screenshot 1 and 2 are also appearing, hence it seems from a task manager perspective, connecting the HDMI doesn't trigger something special.

    The lag and some of the spikes within GPU-Z again occurred as soon as "second screen only" was selected or the lid was closed, hence, there must be something happening which is causing this effect. :(

    I also ordered a Mini Display Port to Display Port (v1.2) as my monitor also supports Display Port. Could this solve my issue? Or is there something else I can do to fix the lag?

    Using a large external display is crucial for me, hence, if my laptop cannot cope with this due to the way the HDMI is connected to the GPU, I will probably return it to Schenker and look for another model which doesn't have this issue (I am still within the 14 day return period). Nevertheless, I prefer not to as the laptop overall is amazing! :(
     

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    Last edited: Aug 4, 2018
  8. yrekabakery

    yrekabakery Notebook Virtuoso

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    Those are the same image.

    Anyway, I think this is a limitation under Windows 10 when the external output is dGPU-only while the internal is Optimus. I have had zero issues with external displays under Windows 7 on non-Optimus single GPU/SLI systems and Optimus systems in which all display outputs were connected to the iGPU.

    I recently talked to a Dell 7577 owner that would get a huge 50% performance drop in gaming with an HDMI TV connected, but normal performance after switching to just the internal or just the external. The Dell 7577 is like yours, internal is Optimus but external are dGPU.
     
    Last edited: Aug 4, 2018
  9. RampantGorilla

    RampantGorilla Notebook Deity

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    I have also had zero issues connecting to a 1440p 60 Hz panel through HDMI on my Clevo P950HP6. The HDMI port is connected directly to the GPU on my laptop.

    @XMG @Meaker@Sager
     
  10. Robertjan88

    Robertjan88 Notebook Geek

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    Apologies. Just replaced the second screenshot with the right one.
     
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