Will 2020 BIOS updates disable undervolting on the XPS?

Discussion in 'Dell XPS and Studio XPS' started by pressing, Feb 13, 2020.

  1. pressing

    pressing Notebook Deity

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    I am running a Dell XPS 9550 (6300HQ) on a recent BIOS 1.12.0 dated 3 oct 2019. It still undervolts fine, with ThrottleStop's FIVR screen showing uCode 0xCC.

    Dell has a newer BIOS 1.13.1 dated 6 jan 2020. I have not tried that lol.
    There is more detail on undervolting challenges on 2020 BIOS updates at the ThrottleStop thread.
     
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  2. _sem_

    _sem_ Notebook Deity

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    I think this BIOS doesn't include Plundervolt mitigation yet (INTEL-SA-00289). Haven't applied it yet though.

    Dunno about the future of undervolting. I guess just disabling is over-reaction or maybe acceptable as a temporary measure. Less severe restrictions should probably work for disabling the exploit. I recall Intel did supply patches with less severe performance impact after a while for some of the previous vulnerabilities.
     
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  3. Techland

    Techland Notebook Consultant

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    I have that latest BIOS, a i5 6300HQ, and undervolt by 115 mV. According to Intel XTU and HW Monitor that still works.
     
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  4. pressing

    pressing Notebook Deity

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    Thanks guys. I just updated to 1.31.1 (dated 6 jan 2020) which is the latest BIOS showing for my system and undervolting still works fine.
     
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  5. Hans Hags

    Hans Hags Newbie

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    Hi All, I just updated to bios 1.11.0 on my XPS 9575 2 in 1 last night, and yes - I did in fact loose option to undervolt, such a shame... I am considering reverting to earlier bios, but then again, there may be other fixes worth keeping, but it was nice to run a bit cooler and more quiet from undervolting - I do notice a bit more fan noise after update ;-o ... but may just need to try out over next week... BR, Hans - Denmark
     
  6. pressing

    pressing Notebook Deity

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    My 6300HQ undervolts to about 170mv and is stable. That is extreme, so undervolting is a real benefit to this old i5.

    Other CPUs don't undervolt much so losing undervolt is not such a disaster.
     
  7. Thorne

    Thorne Notebook Evangelist

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    Just updated my XPS 13 9380 to the latest BIOS (according to Dell it's 1.10 for this machine, 4/2020 version). This is the one in which Dell/Intel blocked undervolting.

    I want to confirm that the "Restore BIOS factory settings" tweak re-enabled my undervolting for Throttlestop!

    Immediately after the BIOS update TS or HWInfo wouldn't show any undervolting, but after factory resetting the new BIOS they started to work again.
     
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