Hi

Can anyone help me to limit the cpu in dell bios of g3 3779 laptop to 90-99% ? The laptop has a problem and it will connect/disconnect continuously from AC adaptor/charging when CPU is being "used" at 100% (even if not 100% sometime). I've done everything to find the fault but I think something is wrong with the motherboard and once I set 90% max cpu performance in power settings in win10, no more problems, I then upped the limit to 99% and still worked perfectly (tested with prime95), if I max it to 100% cpu performance it does again but once I set 99% even with prime95 the battery is charging/no more disconnection issues (I replaced the battery but same issue)

I noticed the connecting/disconnection from charging once in bios as well if I restart the laptop right after being used at 100% for a bit then go to bios. If I reinstall windows I will have to set again the cpu limit to 99% in windows but if I do it in bios it will be safer Smile

There is no setting in bios as with most dell devices to play with cpu mhz/voltage etc. Is there any way to limit the cpu in bios by a mod/hack ?

Thank you very much

@steffabc - How/where are you setting limit to 90 or 99% currently? And, why not just do that?

What are your CPU temps at that under load, this may be the issue, if hitting 100C
Or possibly some other upper temp limit is set in BIOS to shutdown when reached too (I'd have to check), but by design Intel CPU shutdown at 100C before they melt everything including themselves.

@Lost_N_BIOS if I set 99% in control panel/ power manager/ max cpu performance then all is fine with the laptop
temps are fine at 99% & 100% using prime95 etc, this is not a temp issue, the laptop doesn't shutdown but the boards cuts the charging continuously and windows shows every 1 sec charging/not charging ONLY when battery is not completely empty or fully charged
this is why I wanted to mod/hack the bios to set the CPU at 99% to see if is working fine as the 99% windows setting in max cpu performance
I plan to gift this laptop and if they reinstall/reset windows 10 they will need to know to set again this max cpu value at 99% otherwise it will again show charging/not charging continuously whist cpu is heavily used

Battery charging controllers are designed to do what you mentioned, so that is expected, some do it at different starting % though, but they all do that.
Even if you could adjust CPU in BIOS, battery will always do that at xx percentage, and under fake benchmark load it's always going to drain/charge due to the load.

Please link me to the BIOS download from Dell for the BIOS you are using and I will look and see / show you what all settings are possible. Some I may only be able to change in place, not make visible to you, but if you can identify which and we set it that will be OK (may take a few tests)

@Lost_N_BIOS
https://www.dell.com/support/home/uk/en/...-laptop/drivers
bios 26 Jun 2019 1.10.0
thank you

Zitat von steffabc im Beitrag #3

---

@Lost_N_BIOS

---

@steffabc - I find the following, and can adjust to anything you want. Some of this, with some or all options shown, or similar, may be visible to you in BIOS now, I am not sure what you can/can't see without images

thanks, seems complicated so I will ask my relative to set 99% cpu limit in windows when he reinstalls win10
works perfectly fine now with this setting
I will look myself into modding bios for an Asus AIO who's fan seem to be a bit too noisy (it is new'ish so not a fan issue but the fan seem to always run at high speed even though the CPU is at a very low temp and is a low power T cpu)