Higher temps in linux?

So I'm posting this here to get more linux thoughts even though I originally posted in Lenovo

"So I recently picked up a t440p that I have dual booted. Under windows I'm seeing idle temps of around 40c however under linux I'm seeing idle at 54c!!! Any suggestions on how to control this better? That temp is being provided by sensors command.

If it matters I have an i5 4300m and the nvidia 730m. I have installed the nvidia drivers using prime and I have selected the intel profile to ensure it isn't the nvidia GPU causing the heat. I have also ensured my fan is completely clean, I'm going to repaste the CPU this weekend as well

Open to ideas

Thanks"

 

Nvidia Prime doesn't have proper power saving yet. Use BBSwitch/Bumblebee.

Also check your CPU clocks. Intel PState driver might default to performance on some distros. Try disabling Turbo if powersave doesn't help.


You should have lower, not higher idle temperature under Linux than under Windows due to lower idle CPU load.

 

Hmm, I also have found temps to run a little bit on the high side as well. CPU load does tend to be higher in Linux vs Windows. In Windows 7 and 8 CPU idle load is on average 1-2% whereas in Linux I usually see CPU idle in the 7-8%.

When using Linux I typically use a power utility that runs the CPU in power save mode which allows the CPU to run at a lower clock speed.

 

I do not seem to have this issue, I see about 40C in both W7 and Mint 17.2.

 

Sounds like maybe you're seeing a higher idle usage percentage because you're limiting the CPU clock?


Sent from my iPhone using Tapatalk

 

Don't do that. Let the PState driver figure out what clocks to demand. Keeping clocks too low on modern Intel platforms actually consumer more power because the CPU is sleeping less.

 

Actually it was the opposite for me. I down clocked the CPU because idle temps were above average vs idle temps in Windows. Limiting the CPU clock brought the temps down.

 

That's strange. Anything heavy in the background?

 

Nope, my numbers are straight from a fresh install with everything default and that includes several versions of Linux dating back to 2010. The only thing I noticed was the power manager was set to "on demand". So I downclocked the CPU to power saver and the laptop ran a lot cooler. But regardless my idle CPU load typically is between 5-7% whereas OS X is between 2-6% and Windows 10 is between 2-3%.

 

Are you looking at i7z states or your load average from top?

 

Are you on an AMD system?

On Intel platforms with anything Sandy Bridge and later you shouldn't have "on demand" if the native Intel PState driver is running. There's only "performance" and "power saving".

 

My Dell laptop was made in 2009 so it's definitely not SB.

 

That explains it. Intel's driver team has abandoned pre-Sandy for a while.