I've cobbled together a script that runs under eselect to list/set COU speeds/governors on my machines. I set max speed when I'm using the machine, and min speed when not. It has run fine so far, except recently on an Intel Silvermont machine (64-bit Atom family) running Gentoo kernel 4.12.12. Userspace CPU control is not available, even though I've asked for it under "make menuconfig". On other machines /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors shows...
conservative userspace ondemand performance
...but on this one machine it only shows...
performance powersave
...so I know it's the machine, not my script, that's the problem. Note
that I set conservative, performance, powersave, and userspace in the
"make menuconfig" process, and made userspace the default governor. One
difference I noticed on the Silvermont is CONFIG_X86_INTEL_PSTATE=y
which is the opposite of the machines that things work properly on. So
I went into "make menuconfig" to try to switch it off, but I get...
-*- Intel P state control
Yes, it is *FORCED* on on that one machine. Now what? I'm attaching
/proc/config.gz from the Silvermont in case it helps. Feel free to
comment on other stuff in config.gz as well.
--
Walter Dnes <[email protected]>
I don't run "desktop environments"; I run useful applications
config.gz
Description: Binary data
