Make sure your heatsink isn't clogged up any. Good idea to clean it out with a can of compressed air every once in awhile.It can indeed be tough to tell with a laptop in regard to fans, as you are never exactly sure of what they are doing, unless of course you monitor them constantly (not happening). Just another example of how having locked down BIOS can slow some down (literally and figuratively).
1. Open task manager
2. Select the "performance" tab
3. Close all applications and wait for CPU usage go down to 1-3%
4. Watch the value displayed underneath "Speed" for about a minute
5. Unplug / Plug in the power supply and watch the CPU frequency again
I'm already cleaned and added new thermal to my CPU & GPU like 2 weeks ago. It helped me a lot!
When i'm starting up my windows i don't have any applications running.
Maybe i found a solution... i was playing with processor power management -> Maximum & Minimum processor state.
and found interesting results:
Minimum & Maximum on 72% CPU work stable on 1.78GHz:
Minimum & Maximum on 99% CPU work stable on 2.48GHz:
Minimum & Maximum on 100% CPU work stable on 3.25GHz:
And yes, my laptop CPU speed goes from 3.5GHz or from 2.48GHZ to 1.8GHz when i unplug and plug in the AC Power adapter! and it stays on 1.8Ghz all the time till i restart my laptop.
And one more strange thing... when i set my processor state to 99% on power option and turning off my laptop. Then starting it up and i have 1.8Ghz on start up. But, after restart i have 2.48GHz .
I'm using "Conservation mode" on my laptop. That means my battery always on 60% with plugged in AC power adapter.
Try disabling the Enhanced Intel SpeedStep® Technology, another thing I would recommend is updating your BIOS version, see here for the download Laptops :: Lenovo Y Series laptops :: Y50-70 Laptop (Lenovo) - Lenovo Support (US).
Try disabling it with these steps How do I turn off Enhanced Intel SpeedStep® Technology (EIST)? | Yahoo Answers.
Qukerz, have you tried contacting Lenovo in regard to this matter? If you have not done that, try to since it is possible that they may already be aware of the situation and could give you specific troubleshooting assistance.
Thank you for helping me
I figured out there is a problem in my model of laptop. I'm already asked them to add new BIOS update. To fix that my CPU won't slow down to 1.8GHz after i return from sleep mode.
My Enhanced Intel SpeedStep® Technology works great! But i disabled the turbo boost by reducing "Maximum & Minimum processor state" to: 99% because my laptop overheat with turbo boost with 3.5GHZ. Now it work great with max speed 2.5GHz
Till Lenovo will release a BIOS fix.. now i'm using "Power Saver Mode" instead of "Sleep Mode" i think its best alternative.
Sure, you're welcome. I am glad to hear to heat that you were able to track this down.
Let me know if the new upcoming BIOS fixes your issue.