Question: HP EliteDesk 800 G2 BIOS and Fan Speed

Discussion in 'BIOS Mods' started by TCB13, Mar 21, 2022.

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  1. TCB13

    TCB13 MDL Novice

    Dec 12, 2013
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    #1 TCB13, Mar 21, 2022
    Last edited: Mar 21, 2022
  2. Hunterrules0_0

    Hunterrules0_0 MDL Junior Member

    Nov 27, 2021
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    What is the bios is it AMI, Insyde, etc
     
  3. TCB13

    TCB13 MDL Novice

    Dec 12, 2013
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    It's all HP branded, on boot is just shows the HP logo right away.

    Also Linux reports it as HP:

    Code:
    BIOS Information
            Vendor: HP
            Version: N21 Ver. 02.53
            Release Date: 04/16/2021
     
  4. Hunterrules0_0

    Hunterrules0_0 MDL Junior Member

    Nov 27, 2021
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    Ok ill see if I can mod it
     
  5. TCB13

    TCB13 MDL Novice

    Dec 12, 2013
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    Thank you for your reply, I would be very happy with lowering the speed to 20% of what is going right now.

    Now I don't really understand how the UEFI/BIOS works however in other systems I've access to the fan speed over pwm. Is there anything in this BIOS that blocks the OS from acceding the fan PWM like in generic / unbranded systems?

    Thank you.
     
  6. Asparagus Lover

    Asparagus Lover MDL Member

    May 17, 2019
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    You mentioned earlier that you've set the fan to the lowest speed it allow... Could you please capture a shot of that setting in the BIOS for me?
    With no way to determine if the speed is being controlled by the multicontroller chip, among many other probabilities, I'm at a loss to answer.
     
  7. TCB13

    TCB13 MDL Novice

    Dec 12, 2013
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    #9 TCB13, Mar 24, 2022
    Last edited: Mar 24, 2022
    (OP)
    Yes I'll get you the shot tomorrow once I get to the PC.

    Thank you once again. :)
     
  8. Asparagus Lover

    Asparagus Lover MDL Member

    May 17, 2019
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    #11 Asparagus Lover, Mar 26, 2022
    Last edited: Mar 26, 2022
    @TCB13
    Bad news: this is the only fan-related setting in your BIOS (even among the hidden settings). By asking you for these shots, I was able to easily find where the menus are actually stored in the BIOS. Without this information, I might suggest using a special utility to assign a negative value to this setting, which would result in a fan slowdown. But for this your BIOS should have a 64 bits store, when in fact it has only 16 bits available. With this limitation, it is impossible to reduce the fan speed using the method of variable editing.
    This situation can be solved by installing a modified BIOS, but the process of installing the BIOS is another overcomplicated task. The thing is that HP computers are very protected.
    However, what they should not be protected from is loading ACPI tables in Windows. This is what I actually started with. What do you think of all this?
     
  9. TCB13

    TCB13 MDL Novice

    Dec 12, 2013
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  10. Asparagus Lover

    Asparagus Lover MDL Member

    May 17, 2019
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    You did everything right. HP put a lock on this too.
    You understand that if a computer has artificially installed locks, you have less feasibilities to control its work. So what else can be done here? I'm out of ideas.
     
  11. Hunterrules0_0

    Hunterrules0_0 MDL Junior Member

    Nov 27, 2021
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    maybe you can find a way to write it to a temporary epprom and then transfer the data to the real one with those usb bios programmer things. I dont really mod on real hardware so I dont know if that would work
     
  12. Asparagus Lover

    Asparagus Lover MDL Member

    May 17, 2019
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    #17 Asparagus Lover, Apr 1, 2022
    Last edited: Apr 1, 2022
    Isn't it too much effort for the fan?
     
  13. TCB13

    TCB13 MDL Novice

    Dec 12, 2013
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    Exactly :D

    This tweaks were a nice try tho.