CPU overheats

[Mark Phelps]

Hardware and kernel does not mix in here! I've read somewhere (sry couldnt find it anymore - I tried) that newer Linux kernels are more power hungry. Where do all this power goes - heating.
On the other hand... using older kernel on newer hardware should not make sense.

...dont mind just passing through.

It's more a matter of the newer kernels not handling idling the CPU as well as the MS Windows kernels do -- not surprising, since the laptops are supplied with drivers from the suppliers that handle that well. Since the CPU is generally running faster, it's also running hotter -- which serves to heat up the other components in the laptop, as well.

As said, hybrid (or switchable) graphics is not well implemented in Linux.

[jimafternoon]

I had this issue with the switchable graphics on my Lenovo Ideapad u400.

I found a fix, maybe you can adapt it to fit your needs.

In terminal, enter this

sudo nano /etc/default/grub

When you see this line. change it to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash modeset=1"

, adding "modeset=1" after the "quiet splash"

Press ctrl+O to save, and then ctrl+X to close.

Now, open your terminal and type:

sudo su
echo ON > /sys/kernel/debug/vgaswitcheroo/switch
echo IGD > /sys/kernel/debug/vgaswitcheroo/switch
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

This turns off the switchable graphics and just uses the intel graphics, and the fan turns off immediately for me.

If this works, you can also copy and paste those three 'echo' lines into the file that opens when you type into the terminal

gksudo gedit /etc/rc.local

(paste them just above the 'Exit 0' line at the bottom), and then save. This will run the commands automatically on startup.

Good luck, maybe this can help you.

[zrdc28]

To solve your problem go to the link below and install jupiter and your problems will be over. It will throttle your cpu when it is not needed. It will appear
in the top right as a icon.

http://www.ubuntugeek.com/jupiter-li...ol-applet.html

[BobosAbelMihai]

@jimafternoon,i tried to do those steps, but when i must copy the 3 echo comands say to me no such directory, but i managed to copy those in the file

gksudo gedit /etc/rc.localI installed Jupiter, so far it look's good.
The thing is now when is idle is around 50-55....when i work with it it goes 60-65. It's a reason to be worried?

Thank you all very much.