PC extremely slow when HDMI TV connected

Discussion in 'General Hardware' started by Ejziponken, Jan 15, 2019.

  1. Ejziponken

    Ejziponken Member

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    Hi

    Bought a new TV a while ago and its connected to my computer via HDMI. Using a GTX 1080 card.
    Ever since I got the new TV, everything that is going on on my gaming monitor is very slow.

    Like super laggy/delayed. Watching Youtube videos the video lags behind the audio and it stops and lags. Also when typing in Chrome, Discord etc, its a bit delayed.

    This happens even im not running any videos or anything else on my TV. Also happens even if my TV is turned off, but with the HDMI connection still active on my PC. As soon as I turn the TV off on my PC with win+P -> only PC monitor, its works fine again. This did not happen with my old TV using the same HDMI connection.

    I did buy a new HDMI cable but that did ofc not solve the problem. I also reinstalled the latest Nvidia drivers but also without solving the problem.

    Anyone have any ideas how I could solve this problem?


    Monitor: Asus ROG Swift PG279Q
    TV: Samsung QE55Q7FNATXXC 4K QLED Smart-TV

    Gigabyte GA-Z97X-UD5H BE
    Corsair RM 850W 80+ Gold
    Intel Core i7 4790K 4.4GHz
    Gainward GTX 1080 Phoenix GLH
    Sound Blaster Z
    Corsair 16GB 1866MHz VENGEANCE
    SSD 240GB OCZ Vertex 460
    Windows 10 Pro x64
     
  2. Mufflore

    Mufflore Ancient Guru

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    I use the Q9 version and there are no issues like this, from a 1080ti.
    What happens when you only have the TV connected?
     
  3. anxious_f0x

    anxious_f0x Ancient Guru

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    Couple of things I’d be checking, what refresh rate it’s using when connected via HDMI as it sounds like it could be using the lowest available, second thing I’d check is if running at 4K resolution does it need to be connected to a specific port on the TV? Some TVs only have a couple of HDMI 2.0 ports so make sure connected to one of those.
     
  4. Mufflore

    Mufflore Ancient Guru

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    Fair points.
    As you say some TVs only let 1 port allow UHD 60Hz 4:4:4.

    It gets a little more awkward, this is what happens on my new TV.
    Even though all 4 ports can be used for UHD 60 4:4:4, you have to tell the TV which ports will require higher bandwidth.
    If you unplug a cable it defaults back to the lower bandwidth setting, it will not remain how you set it.

    I think the reason is to make it easy for kit that cannot do UHD 60 4:4:4 to immediately work at UHD using default ycbcr 4:2:0 colour.
    ie If you plug a PC with a modern NVidia card into a UHD TV with an HDMI 1.4 max capable cable (and/or a pre HDMI 2.0 gfx card), it will display UHD 60Hz but with 4:2:0 colour, instead of displaying nothing. AMD cards will display UHD 30Hz.
    When using a full bandwidth HDMI 2.0 cable and a capable gfx card you can now get UHD 60 4:4:4, BUT ycbcr 4:2:0 is no longer an option.
    It appears 4:2:0 is only available on low bandwidth connections for this reason.
     
    Last edited: Jan 21, 2019
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  5. anxious_f0x

    anxious_f0x Ancient Guru

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    Can be a real pain to get what your after with some of these new panels, my old Panasonic used to refuse to go into 60Hz when connecting a PC, only 24Hz would be available unless I renamed the input to PC and then restarted the TV, really strange way of doing things.

    Hopefully HDMI 2.1 solves a lot of this.
     
    Mufflore likes this.
  6. xrodney

    xrodney Master Guru

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    That's strange, I used two different TVs from Samsung as PC monitor and never had any issues with HDMI you are talking about.

    Marking on HDMI cables as 1.4, 2.0 is nonsense, any manufacturer write what ever they want on cable spec, but thing is you can have good quality 1.4 cable able handle 4k@120Hz or 2.0 cable that can't manage even 1080p.

    Main point here would be use good quality cable with as short as possible lenght on 1m lenght pretty much cable is irrelevant, but when using 4-10m you need extreme quality cables.

    As for setting on Samsung TV, simply setting port to UHD allowed me to use 4k@60Hz 4:4:4 chroma without any issues and I could freely change resolution and any chroma settings without it to revert back. Easily 5-6 times a day switching between DVD/Bluray 1080p/4k 4:2:0 to 4:4:4 PC/XBOX One (using AV Receiver to switch devices here) and also disconnecting and reconnecting device was not issue.

    Only time when settings on TV might got reset was when changing critical settings, like color mode on TV or updating firmware.
    Maybe it could happen if you switch ports on TV cant comment on that, but with Receiver using always same port there was non issue
     
  7. Mufflore

    Mufflore Ancient Guru

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    My Q9 (the current new model) provides a section called HDMI UHD Color.
    In there are the 4 HDMI port names each with a selector to set off/on.
    If I unplug a cable on any port that is set to on, the next time I plug it in it is set to off.
    Every time.
    Quite annoying because a few times it took me a while to realise what was wrong.
    I didnt say all TVs do it, its not strange imo.


    ps the HDMI cable comment was illustrating a point, it wasnt meant as a blow against cables.
    Most of my old HDMI 1.3/1.4 cables work great as HDMI 2.0b, 1 out of probably 8 wont display UHD 60Hz 4:4:4.
    I have another new one that will not and its only 2m long, this came with my AVR last year as a free "UHD" cable but it appears it can only do 4:2:0. It works fine with HDMI 1.4 devices.
     
    Last edited: Jan 22, 2019
  8. xrodney

    xrodney Master Guru

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    I was not attacking you, was just surprised, If that happened to me I would probably be bugging Samsung quite heavily to fix that with FW update as that should be easy fix to remember UHD setting on each port.

    As already mentioned I do use AV Receiver permanently connected to TV ARC port and that maybe why it never happened to me.
    My TV was UE40JU7000 (at the time highest model available in sub 55" size due to using it as monitor on desk).

    On other hand I have another even more annoying issue due to how Microsoft designed windows and Nvidia Drivers.
    When I got G-sync monitor I had to use DP to get 120Hz G-sync functionality and still need use HDMI to get audio to receiver which unfortunately created virtual display you cannot see. It would be very nice to be able use HDMI just for audio streaming.

    Yes HDMI Cable mess is quite bad and I seriously hope new 2.1 certification helps with that a lot.
     
  9. Mufflore

    Mufflore Ancient Guru

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    NP, I deleted parts of my post that appeared contentious, my comments werent meant that way.
    I hoped you hadnt caught them :)

    I agree.
    Unfortunately HDMI is primarily for video, it will not be allowed to transport audio without a video signal.
    What would be nice is NVidia allowing this to be configured so the video feed to the AVR is completely isolated from other displays and isnt used for display purposes.
    I too get annoyed with this.
    If I enable my AVRs HDMI it can shift icons around and takes my gfx card out of its lowest power state. The unused display sometimes hides things I need to see.
    Each time I want to use my AVR for sound I have to go through a process of configuring displays and the same when I stop using it.
    Grrr.
     

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