Turbo boost gets "unsupported" during runtime
Hi, I have an Intel i7-7500U processor(Lenovo Yoga 510 if that matters). I'm using kernel 4.12.5-300.fc26.x86_64, also tried the newest kernel in the repos, however I have the following problem:
When I boot my laptop, turbo boost is "supported" as reported by cpupower frequency-info. However, after some time it gets "unsupported", I get the following output:
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: Cannot determine or is not supported.
hardware limits: 400 MHz - 3.50 GHz
available cpufreq governors: performance powersave
current policy: frequency should be within 400 MHz and 2.70 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency: 2.70 GHz (asserted by call to hardware)
boost state support:
Supported: no
Active: no
Right after boot, it was
boost state support:
Supported: yes
Active: yes
As a result, the processor cannot achieve its boost state, which is 3.50GHz. At first I though that this was because the CPU is getting warmer and that's why it needed to be on a lower frequency, but this is not the case - it seems that the CPU is at only +43.0°C, whereas I've seen it run at +70 when under heavy load. Can anyone help me to resolve the problem?
Maybe you have some software installed and running which disables Turbo Boost on a power policy or similar.
cat /sys/devices/system/cpu/intel_pstate/no_turbowill show if it is disabled, a value of0means enabled,1means disabled. Maybe a software is using this switch to disable it.@thomaswood Thanks for the suggestion, but unfortunately I've setup only TLP as power manager, I tried disabling it but it still doesn't solve the issue. I suspect it might a kernel problem.