Kernel Bug Tracker – Bug 41292
scaling_min_freq reverts to cpuinfo_min_freq after wake up
Last modified: 2013-06-09 08:22:13 UTC
Environment: Core i7 M620; ondemand; acpi-cpufreq; microcode/version == 0xc
Description: When I set scaling_min_freq on all cores, only cpu0 retains its value after awaking from suspend-to-ram. All other cores revert to the minimum frequency.
Expected behaviour: Cores would retain scaling_min_freq after waking.
Created attachment 69062 [details]
Snippet of dmesg at sleep/wake border.
It's great that the kernel bugzilla is back.
Can you please verify if the problem still exists in the latest upstream
On 3.2.5, all the cores >0 have scaling_min_freq at cpuinfo_min_freq.
please attach the output of "grep . /sys/devices/system/cpu/cpu*/cpufreq/*" both before and after suspend.
The same behaviour is seen in 3.6.1 kernel. See attached before and after results.
Created attachment 88311 [details]
sys cpufreq values before shutdown
Created attachment 88321 [details]
sys cpufreq values after shutdown
FWIW, I use KDE's hibernate command to go to sleep.
Do you still have this problem on latest mainline kernel? Thanks.
Any update on this bug? Does this bug take place during s2ram?
*** This bug has been marked as a duplicate of bug 15295 ***
I think this is a duplicate of bug 15295, and should have been fixed by latest upstream kernel v3.10-rc2+. If you are still available, please test it and report back, thanks.