incendery
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running whatever the latest EC firmware was can't remember off the top of my head 😅, I wish dearly I could get the clevo EC firmware with the fixed behaviour for CPU throttling but unfortunately that isn't possible. I believe it can be flashed through DOS but I would not recommend it unless you have a backup method of flashing so I strongly suggest getting a programmer 🙂 they are very handy to have. just a single 330w unit, I am a little close to the limit under full load but perfectly fine normally
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Intriguing problem, I ran into a similar presentation of an issue with my machine but it came down to load spikes on the CPU causing the VRM to trip OCP (this was set lower as standard on the p775dm3, your tm1 has a higher 180A shutoff limit) I would be suspicious of the GPU causing this as I am unable to cause GPU shutdowns with a shunt modified 3080 on the same mxm power delivery circuitry. what clocks do you have your CPU set too? the Prema bios will have the power limits removed from my understanding. if you run an OCCT avx2 stress test on the CPU what power draw do you get? I was in the past able to comfortably run a stability test in OCCT with CPU + GPU but a CPU test would immediately shut off on initial spike. when running on battery you won't have nearly the power headroom and your CPU will not clock as high so the power draw is lower. I could be wrong entirely but this seems very similar to what I came across 🙂
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fantastic post very well written, thanks for your insight into this one 🙂
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Hi there all, merry christmas and happy new year!
incendery replied to janepa's topic in New here? Introduce Yourself
incredible work! love it 🙂 -
You're badgering them about a 10 year old barebones laptop during likely a somewhat busy Easter period, have some respect for people busy at work please, the world does not revolve around your laptop wants and needs.
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"Anyway, by trying to fix it, you'll learn many things. 🙂" very well said 🙂 this is the best way to learn
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at minumum to POST you will need CPU, GPU and one stick of ram. POST stands for power on self test. the EC bios can be flashed I believe it's stored on an 8pin flash like the main bios on these machines, sourcing a file is a different story I'm not sure with that 😬 maybe someone else here with a p870 can provide one.
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A small update for tonight before I can do a full writeup with more testing. The current limit modifications have been a success!! I am able to pull 130W from the CPU sustained on a heavy avx load which would previously shut the laptop down immediately. I have yet to set up my MCU to convert the fan control signal so they are both running at 100% (good cooling but loud! 😅) I will do a thorough breakdown of the process once I have done more testing but I am so far very happy with the results
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thanks! It's been a while since I played with the bios modifications and there was some back and forth getting all the drivers to work properly, I've attached a bios I modified for another user here for the p775tm1g (z370) this should work with your rtx3080 out of the box. for my own machine I am using the z370 derived Dsanke bios (that person is a wizard and I am in awe at their skills) which I have tweaked with the board ID changes and also fixed the audio driver bug due to mismatched IDs P7xxTM1-0729-9900KS_BoardID7715_3080 NvdGPUDxe_audiofix.7z
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I missed another component which needed changing, PR162 must be changed to 27k
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check page 110~ in the schematic here (dm3 but the dm2 VRMs are essentially cloned) I'm not sure the offsets in bios do anything to affect these voltages unfortunately as the outputs appear fixed (except for vcore) and vcore/uncore are not seperately adjusted. I could be incorrect on this but it may be worth investigating 🙂 https://oem.whyopencomputing.ch/Computers/Service Manuals/2023.11.22_P775DM3_Service_manual.pdf
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Life has been very busy so I haven't had much chance to work on this laptop for a long while until recently. Todays plans are to modify the current limit through PR27 which sets the OCP (144A on the DM3, 180A on the tm1g despite the same VRM configuration) changing from 30k - 38.3k there are 2 other resistors which require changing here , r177 and r162 in line with the p775tm1g schematic, I misunderstood their function before and there's a bit more going on than I first thought, the data sheet for the ncp81248 voltage regulator (close to the one in this machine) has the proper calculations for the resistor values on page 19* While the laptop is in pieces I am also converting to the modified A51M fans from Taobao, they require a PWM signal and unfortunately I did not buy the converter offered by the seller at the time so I must make my own, I am bypassing the onboard NCT3941S linear DC fan controller which takes a simple 0-3v input signal from the EC and outputs x4 the voltage to the normal fans, unfortunately the EC is not using PWM in this case which would have made my job easier! I will be using some small MCU to convert the 3v to a PWM signal to send to the fans. For now all I will be doing is attaching a breakout cable so I can tinker more with the fans externally without needing to run jumper wires to the board. More updates soon.
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A strange question but what slot is your main NVME drive currently installed? I have trialed moving my drives around and putting my main drive in the slot under the main cover and not the cover for the subwoofer / SATA drives, this from some small testing seems to have improved the issue? very strange.
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A small update on this project, I have pulled the laptop apart for some unrelated modifications to the fans and while it is apart I'm going to change the current limit resistor and hopefully not explode it! 😅 While I have it open I will also be modifying the Imax value through PR190 so throttlestop isn't necessary for running over 120A to the core. The changes are as follows: PR27 (OCP set) 30k -> 38.3k PR190 (IMAX) 95.3k -> 110k
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Hello! this is a behaviour of the embedded controller causing the CPU to throttle when GPU load is applied, unfortunately this is seemingly only solvable with premamod EC firmware but that is practically impossible to find:( throttlestop will do fine as it continuously overrides the register change the EC makes
