Broken Optimus; most bizarre issue I've ever come across

Discussion in 'Gaming (Software and Graphics Cards)' started by Sebi97, Feb 27, 2020.

  1. Sebi97

    Sebi97 Notebook Evangelist

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    I have a Y740 laptop with a mobile RTX 2060 GPU. The y740 is one of the rare laptops that allows GPU switching in the BIOS level between discrete gfx (where the dGPU drives display alone) and switchable gfx (where optimus is enabled and the iGPU drives the display with the dGPU kicking in when needed)

    Now, with Optimus on, I got 3.5-4 hours of battery life and with it on about 1.5 hours. Those number make sense. Now, here's where I am at a loss. Somehow, things got inverted! Optimus on gives me 1.5 hours vs 3.5-4 if I have Optimus off. I also have the indicator icon that is black and white when dGPU is in use which confirms that theoretically, the dGPU is off when in Optimus. WTF

    Here is some battery info:

    Hybrid mode on/optimus enabled: Idle power consumption 34000mW, no G-Sync option in NCP, about 1.5-2 hours battery
    Hybrid mode off/optimus disabled: Idle power consumption 16000mW, G-Sync option in NCP, about 3.5 hours battery

    I am at a loss, could it be that somehow the settings got reversed? Is there anyway to check if Optimus is enabled or if I am running off dGPU directly.
     
  2. Talon

    Talon Notebook Virtuoso

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    I would start with a BIOS reset/clearing. As to determine which mode you're in, simply go to the Nvidia control panel and look at the options available. If you're in Optimus mode, you will have limited options available including; Adjust image settings, Manage 3d settings, and Configure Surrond,PhysX. If you're in dGPU you will have a full desktop experience/look to the Nv Control Panel including G-Sync, Change Resolutions, etc.
     
  3. Sebi97

    Sebi97 Notebook Evangelist

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    I actually did check that and it is consistent to my issue. With optimus on, I have a limited NCP as expected,(massive battery drain) with optimus off I have the full NCP with G-Sync & other settings.(minimal battery drain).

    I was going to reflash the BIOS but the Lenovo tool won't let me as it gives an error that the BIOS I have is the same as the one I am trying to flash

    EDIT

    Things are getting even weirder... So I have Optimus on, GPU icon is black/white and NCP is limited. But massive idle power draw(~30,000mW) and 1.5 hours of battery. Then, I launch furmark (Just launch app, not run any stress tests) which "wakes" the dGPU (icon turns colored from black/white). You would expect power draw to increase as the dGPU is awakened but NOPE, my power draw DECREASES. Waking the dGPU decreases power draw to around 16,000mW and EXTENDS battery life to 3.h hours.
     
    Last edited: Feb 28, 2020
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  4. Hirosake

    Hirosake Guest

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    Man thats screwy....sorry I cant offer any insight
     
  5. Sebi97

    Sebi97 Notebook Evangelist

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  6. Sebi97

    Sebi97 Notebook Evangelist

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    Ok, just wanted to update in case anyone ever runs into this or does a google search and comes across this thread. My issue has been resolved! Spent about 2 days troubleshooting and even probing the mainboard with a multimeter to try to figure out the power draw. In the end, resetting the power plan is what fixed my issue!

    Now, in optimus on and at idle, I have under 10,000mW power draw vs the 35,000 before. Battery life is now back where it was before. Here’s a screenshot of doing nothing at idle/desktop after 5 mins or so


    https://i.imgur.com/yhr28Q3.png
     
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  7. JRE84

    JRE84 Notebook Deity

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    I dont know many people that buy a gaming laptop for battery life but kudos...I personally buy a tablet and 2 in 1 ultrabook for battery life and a gaming laptop to leave by an outlet...but bizzare what happened sorry can't offer insight except its software related and a error in reporting
     
  8. Sebi97

    Sebi97 Notebook Evangelist

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    That's why I bought the Y740, excellent gaming performance equivalent to a desktop 980 GPU and enough battery life of 4 hours on campus. But I do also have a cheap samsung tablet for pdf's that I use.
    I'm just happy I was able to resolve the issue and everything is back to normal.
     
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  9. yrekabakery

    yrekabakery Notebook Virtuoso

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    If an RTX 2060 is performing like a GTX 980, something is seriously wrong.
     
  10. Sebi97

    Sebi97 Notebook Evangelist

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    This is my 3D mark score, I thought a GTX 980 desktop is right around there, isn't it?

    https://www.3dmark.com/fs/21519489
     
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