[Bug 717454] New: Power consumption of 3.0.4 kernel is 10-20W higher than 2.6.37 on new i7 based SandyBridge processors
https://bugzilla.novell.com/show_bug.cgi?id=717454 https://bugzilla.novell.com/show_bug.cgi?id=717454#c0 Summary: Power consumption of 3.0.4 kernel is 10-20W higher than 2.6.37 on new i7 based SandyBridge processors Classification: openSUSE Product: openSUSE 11.4 Version: Final Platform: Other OS/Version: Other Status: NEW Severity: Major Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: awafaa@opensuse.org QAContact: qa@suse.de Found By: --- Blocker: --- Created an attachment (id=450402) --> (http://bugzilla.novell.com/attachment.cgi?id=450402) hwinfo for X220 User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.220 Safari/535.1 Running on Intel® Core™ i7-2620M power usage is through the roof when using the 3.0.4 kernel. On average it is 10-20W higher than the 2.6.37 kernel. My 9 cell battery lasts ~4hrs instead of ~9hrs. hwinfo attached. Reproducible: Always Steps to Reproduce: 1. Boot up 2. Watch battery drain Expected Results: Battery should last ~9hrs+ using ~11W -- 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.
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Andrew Wafaa
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--- Comment #1 from Richard Brown
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Richard Brown
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Greg Kroah-Hartman
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--- Comment #4 from Richard Brown
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--- Comment #5 from Greg Kroah-Hartman
Is there a good simple way of monitoring power consumption in desktops/servers? Powertop does not show consumption unless a battery is discharging but I am interested in seeing if this bug occurs in non-laptop hardware
I use a "Save-a-watt" device that plugs in between the power code and the power plug and it shows the power being used by the system. But it's pretty "crude". In order to do real power testing, you need a fancy scope and a bunch of wires on the battery of a laptop to really determine exactly how much power is being drawn by the system as powertop lies a lot when you are trying to tune things down to the sub-watt level. -- 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.
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--- Comment #6 from Richard Brown
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--- Comment #7 from Richard Brown
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Joey Lee
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Richard Brown
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--- Comment #10 from Richard Brown
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--- Comment #11 from Richard Brown
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--- Comment #12 from Andrew Wafaa
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--- Comment #13 from Joey Lee
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--- Comment #14 from Joey Lee
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--- Comment #15 from Joey Lee
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--- Comment #16 from Joey Lee
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Jon Nelson
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Greg Kroah-Hartman
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Bruno Friedmann
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Richard Brown
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Greg Kroah-Hartman
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--- Comment #22 from Andrew Wafaa
Thanks, yes, that answers my question.
So, with those options enabled, we are back to the old power consumption levels, right?
So there's nothing else we can do here. We can't enable those options "by default", otherwise the kernel would have done so, as some hardware can't handle them, while others, like yours, needs them due to various integration issues (BIOS/motherboard/etc.)
I still would like to have Andrew try this out on his platform, for verification that this does resolve the issue he sees.
I'll verify this shortly, hopefully by tomorrow. -- 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.
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Andrew Wafaa
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Greg Kroah-Hartman
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Andrew Wafaa
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--- Comment #26 from Greg Kroah-Hartman
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Greg Kroah-Hartman
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