I had the same Problem with the CPU in my Lenovo T470s. Intel(R) Core(TM) i5-6300U CPU @ 2.40GHz
i tried intel_pstate=disable which did fix the stuck @ 800 MHz Problem. But Managing CPU govenors ans frequencies was still kind of broken with Kernel 5.3.0-40. So I deleted the intel_pstate kernel Parameter and checked the BIOS / EFI for the CPU management settings. After I disabled Intel Speed Stepping in the Bios, everything was working as expected in Linux. intel_pstate is still availible for the Kernel and the Management of Govenors and Frequencies is just working fine. After a bit of reading up un intel_pstate i think I found another possible Solution or the core reason for This Problem. I did not try it since my problem was solved via the Bios Setting, but it reads promissing: https://www.kernel.org/doc/html/v5.3/admin-guide/pm/intel_pstate.html --- snip If the processor supports the HWP feature, it will be enabled during the processor initialization and cannot be disabled after that. It is possible to avoid enabling it by passing the intel_pstate=no_hwp argument to the kernel in the command line. If the HWP feature has been enabled, intel_pstate relies on the processor to select P-states by itself, but still it can give hints to the processor's internal P-state selection logic. What those hints are depends on which P-state selection algorithm has been applied to the given policy (or to the CPU it corresponds to). ---snap -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1838141 Title: intel_pstate not working. CPU frequency fixed at 800MHz. No cpu frequency scaling. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1838141/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
