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43 Posts

06-30-2019

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P15 Gen 2 / T15g Gen 2 - Overheating, BIOS Crashes during Sleep (CMOS Checksum failure)

2021-10-19, 15:24 PM

I've had both a P15 Gen 2 and a T15g Gen 2 at this point, both on the latest bios as of writing (1.15). With both of these laptops, I've experienced a very bad behavior with the system when it automatically enters sleep mode while plugged in with a graphically intensive program running. I'm unsure if the issue is due to my specific configuration (I use the laptop in dedicated GPU mode frequently), but often when the laptop falls asleep during GPU load the laptop will not wake successfully from sleep.

 

I've been unable to diagnose the issue accurately as I can't reproduce the problem reliably, but after sleep mode with the factory system image while doing the tasks I mentioned, I can only attempt to wake the laptop with the power button. During this state, the laptop's keyboard deck is extremely hot (to the point where it's beginning to smell like a hair dryer in some ways). Once the power button is pressed, the keyboard lights up, then I believe ESC(?), F1, F2, F3, and maybe F4 flash rapidly and the system powers down abruptly, wiping out all apps I had open in sleep mode. I have to press power again to get the laptop back on, which after the machine posts it beeps loudly and tells me that CMOS checksum failed. The time doesn't reset, but instead is frozen at the moment where the computer crashed. I've observed this occurring without me noticing just in sleep mode with nothing running, although the cmos checksum doesn't fail. The clock simply is out of sync by a few hours for no apparent reason.

 

I'm unsure what exactly is the cause of this or a good way to reproduce it, but this is a HUGE problem that needs to be resolved with these notebooks ASAP as the systems are getting potentially critically hot in sleep mode. I don't want to have to get my plastics replaced because my computer is baking itself while it's asleep.

 

My current SKU is 20YQ004FUS

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4296 Posts

01-08-2021

Philippines

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Re:P15 Gen 2 / T15g Gen 2 - Overheating, BIOS Crashes during Sleep (CMOS Checksum failure)

2021-10-19, 17:22 PM

Hello codeHusky,

 


Greetings

 


A CMOS Checksum error happens when the laptop is unable to read the information from the CMOS chip (It is where the BIOS settings are saved).
To work on this, let's start by reloading the BIOS default settings, don't forget to save and exit.
Make sure that the drivers and firmware are all up to date as what the support site offers
Lenovo Intelligent Thermal Solution should also be updated.
Update us how it goes.

 


Regards, 
Lorenzo_Lenovo



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43 Posts

06-30-2019

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Re:P15 Gen 2 / T15g Gen 2 - Overheating, BIOS Crashes during Sleep (CMOS Checksum failure)

2021-10-19, 18:31 PM

During my original troubleshooting of this on my first T15g I performed all of these steps. All drivers are up to date and the BIOS was reset to defaults. The issue still continued to occur regardless.

 

Edit: I see that a new version of this driver was released on the 15th attempting to fix modern standby power consumption. I'll give it some time for additional testing and report back if I encounter the problematic behavior again

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43 Posts

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Re:P15 Gen 2 / T15g Gen 2 - Overheating, BIOS Crashes during Sleep (CMOS Checksum failure)

2021-10-20, 6:06 AM

Just ran into the issue tonight. Laptop was falling asleep on my desk after work. I noticed it turned back on suddenly and beeped at me with checksum bad and time/date reset.

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575 Posts

12-24-2011

United Arab Emirates

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Re:P15 Gen 2 / T15g Gen 2 - Overheating, BIOS Crashes during Sleep (CMOS Checksum failure)

2021-10-21, 5:58 AM

Hi!

 

Do you have a test case of what is "a graphically intensive program running"?

When you say "fall asleep", do you mean when the computer goes to sleep following inactivity as per your policy?

If you manually put it to sleep, can you reproduce the issue?

In the windows event viewer, can you find any entries pertaining to the period when the computer "goes to sleep"

(Windows Logs-> System)

 

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43 Posts

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Re:P15 Gen 2 / T15g Gen 2 - Overheating, BIOS Crashes during Sleep (CMOS Checksum failure)

2021-10-24, 20:46 PM
Intensive program would be a game such as Minecraft, possibly multiple instances of it. By fall asleep, I mean the standard automatic inactivity sleep mode that the computer goes into per default settings in the Lenovo image. Putting it to sleep manually doesn't seem to trigger the issue, so its possible it's an issue when the screen is automatically turned off before sleep. I'm unsure. Event viewer doesn't show any irregular events until there's just an abrupt shutdown.
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43 Posts

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Re:P15 Gen 2 / T15g Gen 2 - Overheating, BIOS Crashes during Sleep (CMOS Checksum failure)

2021-10-25, 18:14 PM

Here's what the machine shows after it crashes in this manner

DSC_1334.JPG
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4500 Posts

12-02-2007

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  • Message 8 of 28

Re:P15 Gen 2 / T15g Gen 2 - Overheating, BIOS Crashes during Sleep (CMOS Checksum failure)

2021-10-26, 11:43 AM

Hello,

 

Just to check, did the CMOS checksum error failure occur on both the ThinkPad T15g Gen 2 and the ThinkPad P15 Gen 2?

 

Regards,

 

Aryeh Goretsky

 



I am a volunteer and neither a Lenovo nor a Microsoft employee.

L380 YogaP50 (20EN-*)P51sP72 (20MB-*)P43sS230u (3347-4HU)T23 (2648-LU7)T42 (2378-R4U)T43p (2678-H7U)T61p (6459-CTO)W510 (4318-CTO)W530 (2441-4R3)X100e (3508-CTO)X120e (0596-CTO)X220 (4286-CTO)X250 (20CM-*)X1e gen3X1 Yoga gen 5X12 gen1X13 gen1Yoga 370

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43 Posts

06-30-2019

United States of America

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Re:P15 Gen 2 / T15g Gen 2 - Overheating, BIOS Crashes during Sleep (CMOS Checksum failure)

2021-10-26, 18:03 PM

Yes, this same error occurs on both models, presumably because they share the same hardware and firmware.

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4500 Posts

12-02-2007

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Re:P15 Gen 2 / T15g Gen 2 - Overheating, BIOS Crashes during Sleep (CMOS Checksum failure)

2021-10-27, 6:40 AM

Hello,

 

That is very, very odd.  In all of the cases where I have dealt with a CMOS checksum error, it has been because the CMOS/RTC backup battery dropped below sufficient voltage to keep small block of RAM that holds the extended CMOS settings and time and date settings charged.  When the voltage drops below the charging threshold, that environment gets corrupt and, voila!, CMOS error.  With UEFI firmware, there's a bit more information stored in that memory, plus the EFI system partition, but the principle is the same.

 

This is the kind of error I would expect have happen in a machine that is many years old and hasn't had that CMOS/RTC backup battery replaced.  I would not expect to see it in a new machine straight from manufacturing, let alone two of them.

Is there anything non-standard or unusual about the operating system or software loaded on the computer?  Was the drive cloned/restored from another computer?  Any unusual hardware attached to the computer?

 

Regards,

 

Aryeh Goretsky

 



I am a volunteer and neither a Lenovo nor a Microsoft employee.

L380 YogaP50 (20EN-*)P51sP72 (20MB-*)P43sS230u (3347-4HU)T23 (2648-LU7)T42 (2378-R4U)T43p (2678-H7U)T61p (6459-CTO)W510 (4318-CTO)W530 (2441-4R3)X100e (3508-CTO)X120e (0596-CTO)X220 (4286-CTO)X250 (20CM-*)X1e gen3X1 Yoga gen 5X12 gen1X13 gen1Yoga 370

Communities: English Deutsche Español Português Русскоязычное Česká Slovenská Українська Język Polski Moto English


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