Date: Fri, 18 Jul 2003 10:48:40 -0700 From: "Kevin Oberman" <oberman@es.net> To: Tobias Roth <roth@iam.unibe.ch> Cc: mobile@freebsd.org Subject: Re: dmesg showing wrong frequency (IBM T30) Message-ID: <20030718174840.5FFEE5D07@ptavv.es.net> In-Reply-To: Message from Tobias Roth <roth@iam.unibe.ch> <20030718172420.GA469@speedy.unibe.ch>
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> Date: Fri, 18 Jul 2003 19:24:20 +0200 > From: Tobias Roth <roth@iam.unibe.ch> > Sender: owner-freebsd-mobile@freebsd.org > > On Fri, Jul 18, 2003 at 06:22:27PM +0200, Poul-Henning Kamp wrote: > > What's "wrong" here is that the BIOS/ACPI firmware in your laptop > > runs your CPU at a reduced rate in order to make the battery last > > longer. > > it should NOT do this. I set the bios to disable speedstep and to > 'max performance' while on AC. also, i run apm and not acpi. > > > It can also be that the case that the "cooling solution" (ie: fans, > > fins etc) does not work well enough and the ACPI code has slowed > > down the CPU in order to not melt anything [*]. > > that was also one of my suspicions. the fan is brand new, ibm replaced > it after i sent the unit in because of heat problems. > > could it be that the design of this laptop is bad, when it comes to > heat conduction? > > shouldn't i get the full 1.8GHz when running on AC, and be able to > do a buildworld without any sig11 on a hot summer day (~28 deg c room > temp). those sig11 are just another thing that may be connected to my > low cpu freq... I have not had any issue running a buildworld on my T30 on a hot day. (It hit 105 at my house yesterday and 103 at Lawrence Livermore about 3 miles away.) It runs at 1.8 GHz and takes under an hour to build CURRENT, about 35% longer than it took with STABLE. No 11s sighted. It does get HOT..too hot to really be a laptop unless you have well insulated pants, but within spec for temperature. (At least with ACPI running so that I can monitor the temperature.) The exhaust vent is blowing a strong stream of very warm air. I do see messages that the system is switching between performance and economy mode when I switch from AC to battery, but the CPU pays no attention and the speed stays unchanged under both APM and ACPI. :-( It sounds like something is very wrong with your T30. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634
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