Today I installed arch linux on a Sandy Bridge laptop.
I installed cpupower which controlls the cpu frequency very good with the cpufreq_ondemand govenor. But the temperature remains over 62°C for the physical CPU. Powertop tells me that the GPU (HD3000) is at 100% all the time, which makes sense as the CPU cores have a temperature of about 50°C each. It does not help to use i915.i915_enable_rc6=1 as a boot parameter (the values 2 and 3 do nothing either); RC6 is not used at any time.
Does anyone know why RC6 is not used? Maybe a conflict between two modules which prevent the GPU from entering low-power states?
Thanks in advance.
Last edited by foobar42 (2012-12-02 21:58:57)
foobar42, you've been hit by the power regression issue in the newer kernel versions (3.6.x IIRC). A quick search about the forums will reveal a lot of information about this issue, including bug reports here and upstream and plenty of solutions. TL;DS = downgrade to an earlier kernel version, somewhere around 3.4.x or 3.5.x depending on the specifics of your laptop.
And I thought I had searched for everything regarding Sandy Bridge. Thanks a lot.