From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 62851] New: Sometimes cpu frequency is stuck at low levels on
Dell Lattitude E6320 (Sandybridge i7-2640M)
Date: Fri, 11 Oct 2013 21:54:05 +0000
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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@vger.kernel.org
Reporter: linuxhippy@gmail.com
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.
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