https://bugzilla.kernel.org/show_bug.cgi?id=62851 Bug ID: 62851 Summary: Sometimes cpu frequency is stuck at low levels on Dell Lattitude E6320 (Sandybridge i7-2640M) Product: Power Management Version: 2.5 Kernel Version: 3.11.3-201.fc19.x86_64 Hardware: All OS: Linux Tree: Fedora Status: NEW Severity: normal Priority: P1 Component: cpufreq Assignee: cpufreq@xxxxxxxxxxxxxxx Reporter: linuxhippy@xxxxxxxxx Regression: No Created attachment 110741 --> https://bugzilla.kernel.org/attachment.cgi?id=110741&action=edit cpuinfo output Since updating to 3.10 or 3.11, I sometimes find my Dell Lattitude be stuck at very low CPU frequency levels despite it is not overheated and powered by the adaptor. This causes desite sluggish user experience e.g. build-scripts which usually take 1:30 to run for over 5:00 minutes. I first thought this is caused by a buggy BIOS version, so I updated to the latest available version A18 (June 2013) - which cured the poweroff-problems at reboot I was experiencing (introduced with 3.11), but didn't help the frequency scaling issues. Syslog doesn't show any indication what is going on, the only message I saw which could be somehow related is: [30440.014649] perf samples too long (2502 > 2500), lowering kernel.perf_event_max_sample_rate to 50000 I currently do not have time to bisect the issue, but keep it files in case there are others experiencing the same issues. -- 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
