07-26-2018 06:46 AM
I recently purchased a refurbished Thinkpad W541 that came with Windows 10. On Windows 10, the laptop had some sleep issues that had something to do with the GPU setup and Windows 10 compatibility on the laptop. A clean (non-OEM) Windows 8.1 reinstall later, I fixed the issue but ran into a new one: whenever I unplug the laptop and run it on battery, it immediately locks CPU clock speed on all cores to about 750-780mhz (the bottom of the SpeedStep spectrum for my CPU, the 4910MQ), a completely unusable speed even for YouTube videos and web browsing. No amount of load from any program will make it boost any higher (namely using wPrime).
So I checked the usual power plan options and maxed everything out, but nothing worked. I ended up spending so much time diving into this rabbit hole and trying so many different things that it's easiest for me to just list everything I've tried so far:
1) setting a high performance power plan in windows, and customizing that plan by maxing out all settings
2) setting high performance power mode for speedstep in the bios
3) installing the ThinkVantage PowerManager and maxing out performance options there
4) Following this ArsTechnica thread and installing the Intel CPPC driver, then turning off all the energy effeciency aggressiveness options
5) Checking that temps are ok (they are, under 50c)
6) Using ThrottleStop's BD_PROCHOT tool to stop throttling (Didn't work)
After doing all of these things, I started to wonder what would be causing the throttling instead of tweaking random settings that I'd probably forget about later. So, I started by booting a live Linux USB with the laptop unplugged and monitored core speed using "lscpu | grep MHz." I did not observe any throttling whatsoever. I ruled out the BIOS or some system firmware at this point, though I guess they could still be the culprit. Figuring that the Lenovo power management drivers were causing the issue at this point, I started going through in Device Manager and services.msc and disabling all Lenovo power related services and uninstalling all lenovo power management drivers. No change.
And that brings me to where I am right now. I don't remember the laptop doing this on Windows 10, or even on my current 8.1 install before I installed the power management driver so I could get brightness control working. And interestingly, upon bootup, the laptop doesn't immediately throttle down, but does after a few seconds. It would appear as if a delayed service is controlling it after login, but seeing as I already disabled the Lenovo power stuff, I'm not sure what it could be. Then again, have I properly removed the drivers or not? I guess the "easy" way out for that is a Windows reinstall, but I'd like to avoid that if possible, and I don't really know if that's going to fix the problem. And if the problem is the lenovo power managemnt driver, and I can't tweak it to stop throttling, will I be missing my brightness control?
TL;DR CPU locks itself under 1GHz on battery, completely out of ideas and don't want to reinstall windows., especially if it isn't going to help. Open to any suggestions.
07-26-2018 07:43 AM - edited 07-26-2018 07:47 AM
Whoops repost. On my first post the forum said it was taken down for some reason, so I reposted it and now I can't delete it?
Don't worry, is deleted :-)
Edit: Btw, welcome to the forum!
I haven't noticed and throttling in my W541, but I'm using W10, I'll check my BIOS and Power settings tonight when I'm back home...
07-26-2018 10:33 PM
01-11-2019 01:35 AM
I bought a W541 with i7 and wanted to ask, if there are problems with Windows 10 64bit and cpu throttling on battery or other conditions. I testet a L380 Yoga for a short time. This Notebook throttled the cpu to 0,8 ghz when the power cable was plugged in. I dont want to have this again. I want to use the laptop for audio/music-editing, could it do this job (does it have a loud fan?)
03-21-2019 03:38 PM
After several sleep cycles, my W541 will lock itself into ".78 GHz" when on power- when on battery, it bumps up to much higher speeds. I have to do a "shut down" (and I have Fast Startup turned off because of the Thunderbolt-RAID guaranteed bluescreen: "yay vendor 'supported' (cough) Thunderbolt!) and cold start to get it to behave again.
Then it's fine for days.
05-12-2019 07:45 PM - edited 05-12-2019 07:45 PM
I solved mine by following these steps :
1. Shutdown windows
2. Disconnect Power plug.
3. Take out battery
4. Press Power button couple of times (laptop wont start as no battery or power but this would drain any remain charge inside mobo)
5. Put battery back in and plug back power (Issue should be solved Now)