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Mynnyd
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Posts: 22
Registered: ‎07-31-2018
Location: CZ
Views: 2,387
Message 1 of 23

E485 CPU throttled on AC after waking from sleep

Hi, I have a strange problem. After waking from sleep on AC, frequency of 2 cores of the CPU is capped at 1.6GHz and does not exceed it no matter what. Other 2 cores work fine. Windows task manager shows 100 % CPU usage, but 4 threads around 55 % (see screen), benchmarks scores go down accordingly (20 %), so it is not sensor bug.

 

It occurs only on AC, right after disconnecting AC it starts to behave normaly. But when I reconnect AC, it is capped again, only restart helps. Tried changing Power Options in Windows, but no luck. Guessing some bug in Thinkpad Power Management Driver or BIOS. Do you have the same problem, E485 users? 

Wingqlip
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Posts: 91
Registered: ‎08-24-2018
Location: CN
Views: 2,343
Message 2 of 23

Re: E485 CPU throttled on AC after waking from sleep

I had a similar issue: my graphics chip would downclock to abysmal levels when starting up from sleep or hibernation sometimes. 

Mynnyd
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Posts: 22
Registered: ‎07-31-2018
Location: CZ
Views: 2,300
Message 3 of 23

Re: E485 CPU throttled on AC after waking from sleep

It seems to occur not only when waking up from sleep, but after EVERY reconnecting of AC. So I will have to restart my laptop after every time use it on battery. Nice work, Lenovo Smiley Sad

frogminute
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Posts: 5
Registered: ‎09-02-2018
Location: AT
Views: 2,258
Message 4 of 23

Re: E485 CPU throttled on AC after waking from sleep

This is a very serious problem. Please look for a solution. This happens with all e485/e585 models !!!

gwl37
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Posts: 11
Registered: ‎08-17-2015
Location: SG
Views: 2,187
Message 5 of 23

Re: E485 CPU throttled on AC after waking from sleep

I have the same issue, but I found something interesting, if I install veracrypt and boot from the veracrypt entry in the UEFI instead of Windows Boot Manager, CPU no longer stuck at 1.4GHZ

frogminute
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Posts: 5
Registered: ‎09-02-2018
Location: AT
Views: 2,092
Message 6 of 23

Re: E485 CPU throttled on AC after waking from sleep

Could you please explain the steps you did? I installed VeraCrypt, disabled SecureBoot (necessary?), encrypted my system partition booted via VeryCrypt BootManager but this is still happening to my e585.

gwl37
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Posts: 11
Registered: ‎08-17-2015
Location: SG
Views: 1,986
Message 7 of 23

Re: E485 CPU throttled on AC after waking from sleep

You boot directly from the Harddisk entry not Veracrypt DCS or Windows Boot Manager

But this issue still persist after suspend and resume

gwl37
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Posts: 11
Registered: ‎08-17-2015
Location: SG
Views: 1,983
Message 8 of 23

Re: E485 CPU throttled on AC after waking from sleep

How to reliably demostrate this bug:

Go download CPUZ.

Then Run Stress Test 1866 is the correct score for Ryzen 7 2700U

normalclock.png

After suspend and resume repeat you will find a different score

clockstuck.png 

It stucks at 1400 

dconf
Paper Tape
Posts: 6
Registered: ‎09-15-2018
Location: DE
Views: 1,897
Message 9 of 23

Re: E485 CPU throttled on AC after waking from sleep

I can confirm this bug exactly as stated above on the A485 I just received (having factory Bios 1.0). This is very annoying and needs to get fixed!

Wingqlip
SCSI Port
Posts: 91
Registered: ‎08-24-2018
Location: CN
Views: 1,858
Message 10 of 23

Re: E485 CPU throttled on AC after waking from sleep

If this laptop could achieve a 90*C maximum I think we could see this bulldoze games and rendering software. Through my experiments with resolutions and drivers this laptop has the potential to play even the most demanding UE4 Games. But it constantly throttles from 950Mhz to 400

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