08-29-2018 02:06 AM
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?
Solved! Go to Solution.
09-01-2018 01:50 AM
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
09-04-2018 04:48 AM
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
09-08-2018 06:55 AM - edited 09-08-2018 08:40 AM
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.
09-13-2018 12:58 AM
How to reliably demostrate this bug:
Go download CPUZ.
Then Run Stress Test 1866 is the correct score for Ryzen 7 2700U
After suspend and resume repeat you will find a different score
It stucks at 1400
09-16-2018 04:44 AM
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