Date: Wed, 23 May 2007 07:09:23 -0500 From: Eric Anderson <anderson@freebsd.org> To: Nate Lawson <nate@root.org> Cc: freebsd-acpi@freebsd.org Subject: Re: CPU temp AC vs Battery Message-ID: <46542EF3.7030809@freebsd.org> In-Reply-To: <46379F42.3040700@freebsd.org> References: <4630BCC4.10601@freebsd.org> <4637860D.8060603@freebsd.org> <46378F75.6020007@root.org> <4637944C.5000709@freebsd.org> <46379F42.3040700@freebsd.org>
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On 05/01/07 15:12, Eric Anderson wrote: > On 05/01/07 14:26, Eric Anderson wrote: >> On 05/01/07 14:05, Nate Lawson wrote: >>> Eric Anderson wrote: >>>> On 04/26/07 09:52, Eric Anderson wrote: >>>>> Hi everyone, >>>>> >>>>> I've just noticed something very odd. On my Dell D820 laptop, when >>>>> running off AC power from boot, by idle CPU temperature sits around 58C. >>>>> >>>>> If I unplug the power, and then plug it back in again, it will drop >>>>> down to around 49-50C within a minute or two. It will stay there. >>>>> With or without powerd running. >>>> Another note: >>>> >>>> If I boot up without the AC adapter plugged in, it still runs hot. Only >>>> the transition from AC -> battery seems to make a difference. >>>> >>>> Anyone with some ideas?? >>> Does the temp change at all or is it stuck at 58C? If stuck, maybe the >>> reading is incorrect and something in the AC line transition kicks the >>> EC back into operation. >> The temp does change, about 10C. > > > Hmm.. Seems also that my performance is reduced quite a bit. Doing some > rather lame CPU benchmarks (ubench -c -s), seems that I get a score of > around 200k on AC before unplugging, and about 104k after > unplugging/plugging back in. It definitely feels slower too.. > > I don't see any speed changes or anything obvious in sysctl output. > > >>> If it changes, then perhaps something is generating a lot of interrupts >>> (perhaps SMI or SCI irqs). More debug prints from the acpi-ca Notify >>> routine caller would help zero in. >>> >> Just add some printfs in there and recompile/reboot? Turns out that adding this to my /boot/loader.conf resolves it: cpufreq_load="YES" Eric
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