Clevo P377SM-A with GTX 980 (not M)

Discussion in 'Sager and Clevo' started by Wacholek, Oct 15, 2021.

  1. Wacholek

    Wacholek Notebook Enthusiast

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    Hi everyone,
    Some time ago I found a thread on techinferno when someone change the GPU core from GTX 980M to full GTX 980.
    So I decided to make the same upgrade since I had SLI and one of my cards had cracked core ( cracked but working).
    I bought a burned GTX 980 with a hole in the PCB(burned capacitor). I did repair it and the core itself was ok.
    But cutting to the chase..
    The transplantation seceded. Card has now 6 Vcore power stages and full GM204 core.
    When I was testing it on HP 8760W everything was great. I could access to BIOS and normal Nvidia drivers was successfully installed. No problem with brightness control in windows.
    When I put the card into my P377SM-A I do not have video in BIOS. Just black screen until windows boots up with the drivers. I changed the drivers. Mod it in a way that the 980M was installed. No luck.
    Card is working great but brightness to max is pain in ....
    Both the P377SM-A and the card has their Bios from Prema.

    Any ideas how to solve the problem?
    1.gif

    Best regards,
    Chris
     
  2. Reciever

    Reciever D! For Dragon!

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    Might want to ping @Khenglish who is the member who authored such an upgrade.
     
  3. Wacholek

    Wacholek Notebook Enthusiast

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    Thanks for the info. I just wrote to him. Fingers crossed.
     
  4. MrBorsky

    MrBorsky Notebook Enthusiast

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    1) Newer nVIDIA drivers lack brightness control on some machines (tested on P750ZM/P770ZM/P770DM - latest drivers version with brightness control - 442). I dont know why, but it is a fact. Try older drivers.
    2) Your vBIOS is wrong (980M with 980 core) so you need to try Clevo GTX 980 vBIOS at first, and if it not work - contact with @Khenglish.
     
  5. Wacholek

    Wacholek Notebook Enthusiast

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    I tried desktop 442, 441 and notebook 441. No luck. Should I somehow mod the drivers before?
    I have Clevo GTX 980 vBIOS from here https://www.techpowerup.com/vgabios/190340/190340
    I will give it a try tomorrow. I have the programmer so no problem in case of a failure.
    But I think @Khenglish stated that it is not needed: So it actually works with the 980m vBIOS. I tried modding too soon. I just needed to reinstall the driver."
    The card is working flawlessly except the brightness control and no video during POST.
    I think I read somewhere that bios from P377SM-A has lack of some compatibility. Like not possible to put 1070 in. No problem on P375SM-A though.
    I think that only Prema Bios could help.
     
    Last edited: Oct 15, 2021
  6. Khenglish

    Khenglish Notebook Deity

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    What screen are you using? It sounds like you changed the display from LVDS to eDP. Clevo on SM and EM systems had separate brightness control circuits, which makes switching the display type in their laptops a headache.

    You can't use a 980D vBios. The ram won't work at 7GHz, and idk what other incompatibilities there are. What you should do though is modify a clevo 980m vbios with the correct desktop core device ID. If I didn't already send you a copy, I can in a few days.
     
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  7. Wacholek

    Wacholek Notebook Enthusiast

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    I have standard LVDS display. Nothing has been changed. Only the core.
    In terms of a desktop ID it is like youres when you did the core change. There is no brightness control in the power panel. Like in all desctop cards. Driver do not detect the card as a mobile one so do not install the control. I gess.
    Could you send me the copy?
    Oh, and I found the bios wchich is on the card. It is Premia v2 980m bios.
    Desctop 980 vbios did not work. Tried that by mestake. But I did not try mobile 980 bios. I put extra Vcore drivers and extra capacitors so it might even boot on 7Ghz.
     
    Last edited: Oct 15, 2021
  8. Meaker@Sager

    Meaker@Sager Company Representative

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    With a vmem mod it might.
     
  9. Khenglish

    Khenglish Notebook Deity

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    Cap mods would only add a few hundred MHz. 980m with stock vmem can do around 6.2 GHz at best. At 1.5V they can do low 7s. This is not relevant to the current problem though.

    I am away from my computer with the device ID mod. I can get it to you tomorrow. I'd just redo the mod but I haven't dealt with remembering where the checksum is in a while.

    I had no issues with display on startup. The device ID fix on EM series only helped with driver installation. It still displayed an image on boot. I only used eDP displays though.

    You can try looking up the enablebrightnesscontrol registry mod, but I think that only works for eDP displays.
     
  10. Meaker@Sager

    Meaker@Sager Company Representative

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    My old 780m did 7.4Ghz with vmem but my 980m did 7.1 stock config and 7.0 ish when I added the extra VRM modules (no extra bulk caps though).
     
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