When using the Gentoo AdminCD (and the minimal InstallCD) with an Intel P/E core Processor from Tiger Lake or later, the kernel configuration causes processors to be placed at the maximum clock speed no matter what the system is doing. This is extremely concerning as in extreme cases (such as in mine), when compiling "heavy" packages such as sys-devel/gcc, the machine will have a *thermal event*, causing the machine to instantly shut off, and the UEFI warning about temperatures. Reproducible: Always Steps to Reproduce: 1. Use Gentoo Install/Admin CD on Tiger Lake or above Intel hardware. Actual Results: The CPU's do not scale properly and are stuck to the maximum *turbo boost* clock speed (in my case about 5.6 Ghz) Expected Results: The CPU's should scale up and down as appropriate, with the P (performance) cores clocking down to ~1100Mhz, and the E (efficiency) cores clocking down to ~800Mhz. Here is the output of a machine on idle with a working kernel configuration: user@carbon ~ $ grep -i mhz /proc/cpuinfo cpu MHz : 1100.000 cpu MHz : 800.000 cpu MHz : 800.000 cpu MHz : 800.000 cpu MHz : 1098.729 cpu MHz : 1101.113 cpu MHz : 1100.527 cpu MHz : 1100.058 cpu MHz : 1100.000 cpu MHz : 800.000 cpu MHz : 1098.086 cpu MHz : 1101.157 cpu MHz : 1098.812 cpu MHz : 800.000 cpu MHz : 1101.257 cpu MHz : 800.000 cpu MHz : 801.190 cpu MHz : 800.000 cpu MHz : 800.523 cpu MHz : 800.000 cpu MHz : 800.000 cpu MHz : 800.000 cpu MHz : 800.000 cpu MHz : 820.039 cpu MHz : 800.612 cpu MHz : 800.000 cpu MHz : 800.000 cpu MHz : 800.000 cpu MHz : 799.621 cpu MHz : 800.000 cpu MHz : 800.000 cpu MHz : 800.000 I do have a working kernel configuration to hand (see attached) that scales up and down properly. My suspicion is that schedutil and pstates are not configured properly for their kernels.
Created attachment 884874 [details] Working Kernel Config Working kernel config for Linux 6.7.4
For users looking to install, I'd advice turning off turbo boost temporarily while using the live media as not to damage your hardware. This can be accomplished with: echo 1 >/sys/devices/system/cpu/intel_pstate/no_turbo
