All laptops with a MUX switch

Discussion in 'Hardware Components and Aftermarket Upgrades' started by B0B, Feb 6, 2018.

  1. alaskajoel

    alaskajoel Notebook Deity

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    No mux on the 51m. HD630 is permanently enabled and connected to only the thunderbolt port. No optimus
     
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  2. ole!!!

    ole!!! Notebook Prophet

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    so having igpu work doesnt necessary mean theres a mux. i guess what im looking for isnt mux then lol. but the 51m can use iGPU instead of dGPU?
     
  3. alaskajoel

    alaskajoel Notebook Deity

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    The 51m and several other Alienware machines have both iGPU and dGPU enabled and always available but serving exclusive roles. The built-in laptop display and two of the display outputs (usually HDMI and mini-display port) are directly connected to the dGPU and the iGPU is connected to the thunderbolt 3 port. The configuration cannot be changed, meaning the iGPU cannot output to the built in display, and the dGPU cannot output to the thunderbolt port. Consequently, if you try to disable the iGPU in device manager, you lose thunderbolt functionality.

    This configuration on the 51m does have benefits. You get full displayport bandwidth out of the thunderbolt port for supporting 4k60 monitors, while also maintaining full bandwidth for the DP1.4 and HDMI2.0 ports while also driving a gsync 144hz built-in display. It also allows you to use the Intel graphics for what it's good at, like running a hackintosh or using quick sync, and you avoid optimus frustrations.

    The closest parallel to this I can think of is having a 9900k desktop. There are integrated graphics ports on the motherboard for the iGPU but if you have a dGPU, you probably don't ever use them. In one 9900k desktop of mine, I actually use both iGPU and dGPU--four displays are driven by the dGPU (GTX1080) and 2 other displays are driven by the iGPU (HD630). I have to use the iGPU to drive displays 5 and 6 because Nvidia customer cards only have 4 display clock generators, supporting only 4 displays total even if there are 5 display outputs (like on the GTX1080). There are goofy problems that arise when doing this, but it largely works.

    If you want your computer to essentially switch between exclusively using an iGPU and a dGPU for something like getting better battery life, you still want a mux.
     
    Last edited: Aug 24, 2019
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  4. bobbie424242

    bobbie424242 Notebook Guru

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    The Lenovo ThinkPad P72 has a MUX switch. It is not a gaming laptop but a workstation with Quadro graphics (P600 to P5200) that can also be used for gaming. And of course it has an Intel
    UHD 630. The panels (1080p and 4K options) are 60Hz not G-Sync.

    All external video ports (HDMI, mini-DP, DisplayPort over TB3) are wired to the dGPU (Quadro). This cannot be changed.

    In BIOS there are 2 modes configurable:

    - Hybrid Graphics: the regular Optimus mode, with both the UHD 630 and the Quadro
    - Discrete Graphics: this disables the UHD 630 entirely (not visible to OSes), leaving only the Quadro to drive all displays, including the laptop panel
     
  5. alaskajoel

    alaskajoel Notebook Deity

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    I checked out a new Razer Blade Pro 17" today with the 120hz 4k display and it appears to have a mux. There is a new option in synapse that allows you to reboot into dGPU only mode and the iGPU drops out of device manager. This mode is required for the 4k display to run at 120hz, which of course makes sense as the Intel iGPU cannot provide the bandwidth necessary to do so with DP1.2.

    It's nice to see at least Razer's $3700 premium machine can afford the few extra bucks for a mux when it's absolutely required for the device to function. Completely unreasonable to expect it from the lowly $3200 version of the Blade 17.
     
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  6. TheReciever

    TheReciever D! For Dragon!

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    I am planning to sell the AW13 R3 I have because of Optimus, ruins gameplay for me personally on the internal screen, which was its main purpose.

    Was looking at the y540, but just decided to reinvest into my Ranger instead.

    @Raidriar

    Oddly enough I can enable Gsync on my Ranger with the MSI 1070 installed, with the 120hz stock panel (no 3D emitter).
     
  7. yrekabakery

    yrekabakery Notebook Virtuoso

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    In the Nvidia Control Panel?
     
  8. TheReciever

    TheReciever D! For Dragon!

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    Correct, I enabled it and screen stayed active, no issues that I could tell. I am at work at the moment but when I get back home I can submit evidence.
     
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  9. yrekabakery

    yrekabakery Notebook Virtuoso

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    Interesting. Have you tried running the G-Sync Pendulum demo?
     
  10. TheReciever

    TheReciever D! For Dragon!

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    I have never heard of that but I can try it out, I'm about 20 minutes out.

    EDIT: Ok so it allows me to enable Gysnc through nvidia control panel but seemingly doesnt have an effect on the internal display.

    I now suspect that the option is present in the first place due to my Freesync monitor as when I have the demo running, it defaults to no Vysnc on the internal display, however on my Freesync monitor G-sync stays enabled in the demo.
     
    Last edited: Oct 18, 2019
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