lkml.org 
[lkml]   [2016]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRegression in 4.8 - CPU speed set very low
Date
I have found a regression in kernel 4.8-rc2 that causes the speed of my laptop 
with an Intel(R) Core(TM) i7-4600M CPU @ 2.90GHz to suddenly have a maximum cpu
frequency of ~400 MHz. Unfortunately, I do not know how to trigger this problem,
thus a bisection is not possible. It usually happens under heavy load, such as a
kernel build or the RPM build of VirtualBox, but it does not always fail with
these loads. In my most recent failure, 'hwinfo --cpu' reports cpu MHz of
396.130 for #3. The bogomips value is 5787.73, and the cpu clock before the
fault is 3437 MHz. Nothing is logged when this happens.

If I were to get a patch that would show a backtrace when the maximum CPU
frequency is changed, perhaps it would be possible to track this bug.

Sorry that I can not be more specific.

Larry

\
 
 \ /
  Last update: 2016-09-17 09:59    [W:0.150 / U:0.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site