[Bug 767692] New: After a thermal event, the kernel remains in the lowest speed until reboot
https://bugzilla.novell.com/show_bug.cgi?id=767692 https://bugzilla.novell.com/show_bug.cgi?id=767692#c0 Summary: After a thermal event, the kernel remains in the lowest speed until reboot Classification: openSUSE Product: openSUSE 12.2 Version: Factory Platform: x86-64 OS/Version: openSUSE 12.2 Status: NEW Severity: Major Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: tittiatcoke@gmail.com QAContact: qa-bugs@suse.de Found By: --- Blocker: --- User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1178.0 Safari/537.1 SUSE/21.0.1178.0 My laptop (i5) can scale between 1.1Ghz and 2.4Ghz. During normal working the ondemand governor is active which is working fine. If I now put a high load on the system which pushes all 4 cores to 100% utilization, a thermal event will occur which throttles the system down to prevent reaching critical temperature. At this moment it seems that the maximum speed of the CPU's are set to the lowest possible frequency. Even if minutes later the thermal event is over and the pc has returned to normal temperature, the max frequency remains at the lowest one. This can be checked by checking the value in the file /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq. Only a reboot will restore the original scaling frequencies. This is with the latest kernel in Factory, which is 3.4.2. Reproducible: Always Steps to Reproduce: 1.Check the value in /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 2.Load the system so that a thermal event will occur and the system will be throttled down 3.Check the value in /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 4.Wait 5 minutes and check again the value in /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq Expected Results: The thermal event should not change the maximum scaling frequency. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=767692
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Jeff Mahoney
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Raymond Wooninck
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Raymond Wooninck
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Rafael Wysocki
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--- Comment #4 from Raymond Wooninck
https://bugzilla.novell.com/show_bug.cgi?id=767692 https://bugzilla.novell.com/show_bug.cgi?id=767692#c Bug 767692 depends on bug 773563, which changed state. Bug 773563 Summary: Kernel gets a bogus temperature reading (when under heavy load) and shuts the computer down. http://bugzilla.novell.com/show_bug.cgi?id=773563 What |Old Value |New Value ---------------------------------------------------------------------------- Status|NEW |NEEDINFO Status|NEEDINFO |NEW Status|NEW |ASSIGNED Status|ASSIGNED |NEEDINFO Status|NEEDINFO |ASSIGNED Status|ASSIGNED |NEEDINFO Status|NEEDINFO |ASSIGNED Status|ASSIGNED |NEEDINFO Status|NEEDINFO |ASSIGNED Status|ASSIGNED |NEEDINFO Status|NEEDINFO |ASSIGNED Status|ASSIGNED |RESOLVED Resolution| |INVALID -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=767692
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Raymond Wooninck
https://bugzilla.novell.com/show_bug.cgi?id=767692
https://bugzilla.novell.com/show_bug.cgi?id=767692#c6
Thomas Renninger
https://bugzilla.novell.com/show_bug.cgi?id=767692
https://bugzilla.novell.com/show_bug.cgi?id=767692#c7
--- Comment #7 from Raymond Wooninck
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