https://bugzilla.kernel.org/show_bug.cgi?id=58801 Summary: intel_pstate/powersave - cpu frequency remains at high level if if system is idle Product: Power Management Version: 2.5 Kernel Version: 3.9.3 and 3.9.4 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: cpufreq AssignedTo: cpufreq@xxxxxxxxxxxxxxx ReportedBy: c.h.l@xxxxxx Regression: Yes I have a Lenovo T520 with a Intel(R) Core(TM) i5-2450M CPU and a Sandy Bridge chipset. Starting from kernel version 3.9.1 I switched the CPU frequency scaling driver from acpi-cpufreq to intel_pstate. In combination with the powersave governor it worked like a charm. I had higher frequencies due to the turbo boost (3.1 GHz instead of 2.5 GHz) and when the system was idle the frequency was switched to the lowest values (around 800 MHz). With the kernel versions 3.9.3 and now even 3.9.4 the frequency remains at a quite high frequency (3.0 or 2.9 GHz) even if the the system is completely idle. As I have not changed the kernel-config when I updated to the versions 3.9.3 and 3.9.4 I assume some bug was introduced in the kernel as of 3.9.3. Please let me know if you need any further info. Christoph -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
