01-16-2019 12:24 PM
Before writing this message, I have combed through many articles and forum posting but couldn't find anything that helped.
When I benchmark the machine running on AC, it performs as expected. When I run the same tests on battery, the performance is horrible - about 1/3 of the performance compared to AC.
I have already checked all my OS power management profiles, to ensure that the scheme used for battery is the same on AC; I made sure the slider on on the battery icon is all the way to the right (Best Performance); I've gone into BIOS to set Maximum Performance for CPU speed stepping as well as Thermal Management Scheme. No matter what I do, I can't get it to run at full performance on battery.
All I'm trying to achieve is have the laptop run as fast on battery as on AC, with the obvious expectation that the battery will drain fast (which is fine).
Any help or direction would be greatly appreciated. Thank you!
01-16-2019 03:17 PM
01-16-2019 04:05 PM
Seems like stange behavior. The battery performance slider works well for me and I can defitely tell when I have it too low. Are you sure it's not working at intended by running apps and watching HWmonitor for CPU frequencies or something? Also, be sure to check any performance settings that the Lenovo Vantage app might be overrighting. Seems the built-in windows feature and Vantage might disagree with eachother.
01-16-2019 04:24 PM
01-16-2019 05:07 PM
No problems here. "Best Performance" on the battery icon gives me 4.1Ghz as expected (on my i7). I have Vantage set to "optimize system for performance" but intelligent cooling off. It's a confusing app.
01-16-2019 05:23 PM
01-16-2019 05:43 PM - edited 01-16-2019 05:46 PM
I use the balanced power pan, basically just changed the screen on/off time. Didn't change anyting in BIOS.
Try throttlestop. It's a massive help with getting exactly what you want. Especially the SST setting which make the CPU speeds much more aggressive if you want that. See if that help. But It's VERY weird that the max setting for you is actually the worst...something is not right.
01-16-2019 06:12 PM
I'll give throttlestop a try later tonight as well as factor in all the other info you gave me. Just one more question for now - I know you didn't tweak with BIOS, but just curious, what version are you on? I updated to the latest 1.17.. Wonder if it's a BIOS-specific problem. Again, thanks for all the help. It's greatly appreciated.