Intel sent in as the sole patch for this week's Linux power management subsystem updates is an important fix for Intel Core hybrid systems with buggy firmware. The Intel P-State driver fix can address as much as a 50% performance hit seen with existing Linux kernel versions on affected Intel hybrid platforms.
A Kubuntu Focus developer last week reported a power management issue that breaks scheduling on heterogeneous core Intel systems with buggy firmware. It turns out systems failing to report ACPI CPPC v2 capabilities could lead to very poor performance going all the way back to Linux 5.19. On systems like with an Intel Core i5 13500H and using the EEVDF scheduler, as much as a 50% performance hit could be observed with Geekbench. There have also been other similar bug reports in recent times.