"ondemand" never raises frequency on an Intel Core2 Due (T9900) in a recent Dell E6500
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https://bugzilla.kernel.org/show_bug.cgi?id=14771
vyncere <[email protected]> changed:
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--- Comment #23 from Thomas Renninger <[email protected]> 2010-06-28 15:43:23 ---
Quoted 2 lines
note that when i'm plugged in to my 90W power supply, the ondemand gov works fine.
Ah yes..., this really isn't a kernel bug. Can someone with enough privileges (the reporter?), close it. You should also modify the title, so that others get a quick idea that this is about power supply and whether their problem is related...
Quoted 1 line
I on the other hand am working with a 4-5 year old Pentium IV Prescott
I expect it doesn't support SpeedStep at all (without Enhanced you only got 2 steps), but I am not entirely sure. Theoretically you could read up the Intel docs whether it's supported at all. If, you also could try some rudimentary things in userspace, in this case it's IO and not MSR driven. But instead of wasting the time to finally find out that Pentium IV wasted power like hell and there is not much you can do about that, you better invest some bugs into a new cheap board and a new processor...
--- Comment #24 from vyncere <[email protected]> 2010-11-12 19:09:35 --- Hi all,
My personal experience may help too. I had the same problem with my Thinkpad T410 (Core i5 520 M). With kernel 2.6.36, I had to set the "Performance" Profile in my BIOS, for AC/DC power and Battery mode, instead of "Power-saving / Balanced / etc.". After that, the bios_limit managed to reach the max value, 2.40 GHz instead of 1.20GHz, and cpufreq managed to do its job.
But it's not the only thing. This observation was made with my battery plugged on my laptop, with AC/DC power. Another day, without battery, I was very surprised when I saw that the bios_limit was still stuck to 1.20GHz (!). I think it's a BIOS related problem, very similar to the previous power supply case. But fortunately, "processor.ignore_ppc=1" boot parameter does perfectly the job. (Phew !!!)
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https://bugzilla.kernel.org/show_bug.cgi?id=14771
Petr Baudis <[email protected]> changed:
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--- Comment #25 from Petr Baudis <[email protected]> 2010-11-15 12:04:18 --- BTW, for me, the problems with ondemand governor boiled down to software issues (modulo kernel upgrades throughout 2.6.32.x, this seemed to resolve some most basic issues). First, a lot of my load was niced and I was not aware of /sys/devices/system/cpu/cpu$i/cpufreq/ondemand/ignore_nice_load. Setting this resolved my problems in part. This setting is being reset time by time anyway, but that is likely to be some evil desktop thing trying to meddle with stuff.
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[Bug 14771] "ondemand" never raises frequency if smaller power supply is used (60w vs. 90w) -- Dell E6500
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=14771
Zhang Rui <[email protected]> changed:
What |Removed |Added
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Status|NEW |RESOLVED
CC| |[email protected]
Resolution| |INVALID
Summary|"ondemand" never raises |"ondemand" never raises
|frequency on an Intel Core2 |frequency if smaller power
|Due (T9900) in a recent |supply is used (60w vs.
|Dell E6500 |90w) -- Dell E6500--- Comment #26 from Zhang Rui <[email protected]> 2011-04-22 02:30:06 --- Bug closed according to comment #23.
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[Bug 14771] "ondemand" never raises frequency if smaller power supply is used (60w vs. 90w) -- Dell E6500
In reply to a message not in the archivehttps://bugzilla.kernel.org/show_bug.cgi?id=14771
Len Brown <[email protected]> changed:
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Status|RESOLVED |CLOSED
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