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Linux - Laptop and Netbook Having a problem installing or configuring Linux on your laptop? Need help running Linux on your netbook? This forum is for you. This forum is for any topics relating to Linux and either traditional laptops or netbooks (such as the Asus EEE PC, Everex CloudBook or MSI Wind).

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Old 12-08-2012, 08:05 PM   #1
babbab
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2675qm i7 processor available clock speed


I have 2675qm mobile processor on my laptop and available clock speeds from 800mhz. in windows when idle, the processor clock speed is at 798-799mhz. clearly 1 or 2mhz of speed raises temperature of processor from 50c to 60c in linux when idle.
my newer i5 processor, clock speed avaiable from 799mhz in linux. and it runs around 50c.

is there anyway to downclock my processor 1 or 2 mhz in linux?
is this a kernel bug? if so, is it needed to report this bug?

i'm using 32-bit of slackware 14.0
 
Old 12-08-2012, 08:38 PM   #2
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A difference of 1-2 MHz will never cause a temperature difference of 10C and is usually an error in reading out the correct values.
This looks either that the cores are not getting into the deeper sleep states, the voltages aren't lowered or the video-core isn't clocked correctly.
If this is a laptop with Nvidia Optimus setup it may also be that it isn't configured correctly and the Nvidia GPU is heating up the system.
 
Old 12-08-2012, 09:05 PM   #3
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the laptop is with amd ati graphic and intel 3000, it's hybrid graphic. the temp is reading at 55c or 53c or 50's in windows but in linux it is at 60's. i guess voltage is not getting lower. cpufreq-info in linux tells me the clock speeds are available from exact 800mhz but using cpu-z in windows tells me the clock speed is 798mhz at idle and core voltage is up and down.

the video card mod for ati is not even loaded i add in blacklist. it's using i915 for intel graphic, and i'm asuming ati graphic card is not on.

Last edited by babbab; 12-08-2012 at 09:07 PM.
 
Old 12-08-2012, 09:17 PM   #4
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Not loading the ATI/AMD video diver may be what causes the higher temperature. Even if you load the module you will have higher temperatures, since power-saving in the free radeon drivers simply is bad. I would recommend to install the proprietary driver AMD and use that to switch the display to the integrated Intel core, that may solve the problem.
 
Old 12-08-2012, 09:35 PM   #5
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ok thank you for replying. before i load the proprietary amd/ati module and switch to intel, my googling tells clearly vgaswitcheroo only works with open driver. should i go for installing proprietary driver anyway, and that might lower the temperture?

Last edited by babbab; 12-08-2012 at 09:38 PM.
 
Old 12-08-2012, 09:42 PM   #6
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The proprietary driver should have its own switching system (at least AFAIK).
I don't have a laptop with switchable graphics, but on my laptop with AMD graphics (and many others have the same problem) the CPU runs 15C cooler with the proprietary driver installed, so I assume that this may help you, too. But I can't give a guarantee for that.
 
Old 12-08-2012, 10:31 PM   #7
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I just installed amd proprietary catalyst driver and swiched to intel igp graphic but the temperature is about the same, around 60's c and not going lower. i'm going to erase linux partition on this laptop and use windows. but I'm going to use linux on the other laptop that runs around 50's c. sigh* I'd love to see linux runs cool on this laptop but not happening.

Thank you for your help again.
 
Old 12-10-2012, 10:09 PM   #8
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Before I delete linux partition, I gave one more chance to googling of this temperature issue, and I got the clue from some forum. and this worked!!!

i915.i915_enable_rc6=1
i915.i915_enable_fbc=1
pcie_aspm=force
i915.lvds_downclock=1

now my temperature for cpu and intel graphic is below 60c all time

Thank you again!!!
and Have a beautiful day.
 
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Old 12-10-2012, 11:06 PM   #9
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Nice that you worked that out and thanks for posting back your solution here.
Please mark this thread as solved using the thread tools of the top of the thread if you think that your problem is fixed.
 
Old 12-10-2012, 11:35 PM   #10
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Just found out windows is still running 5-8c lower than linux and I don't know why.
 
  


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