Re: [3.14-rc3] possible regression Haswell runs only at 770Mhz with powersave governor

Dirk Brandewie
2014-02-20T16:48:44Z

On 02/20/2014 07:01 AM, Borislav Petkov wrote:
> Add lists to CC.
>
> On Thu, Feb 20, 2014 at 03:32:36PM +0100, Otto Meier wrote:
>> Hello,
>>
>> My System which runs with older kernels up to 3.13.3
>> fine on my i3-4330 with 3.5 Ghz and governor powersave.
>> and pstate driver.
>>
>> With kernel 3.14-rc3 and Governor powersave it runs
>> only at 770Mhz and never switches to higher Freq. on load.
>> Even compiling a kernel with make -j4 does not change freq.
>>

commit fcb6a15c2e7e76d493e6f91ea889ab40e1c643a4 seems to be the culprit

>> With governor performance it switches to 3.5 Ghz and stays
>> there.
>>
>> Any Idea how to fix this?
>>

Greg KH is seeing the same thing on his Haswell system. I am trying
to figure what went south.

https://lkml.org/lkml/2014/2/19/626

Can you send me the .config for the broken kernel also the output of gcc -v

>> Best regards
>