Date: Sat, 03 Apr 2010 06:01:25 +0100 From: Bartosz Fabianowski <freebsd@chillt.de> To: Ian Smith <smithi@nimnet.asn.au> Cc: freebsd-acpi@freebsd.org Subject: Re: Spurious thermal shutdowns on Dell Studio 1557 Message-ID: <4BB6CBA5.6090000@chillt.de> In-Reply-To: <20100403152134.V35463@sola.nimnet.asn.au> References: <4BB69279.6060005@chillt.de> <20100403152134.V35463@sola.nimnet.asn.au>
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> You should hear the fan come on at 55C, and run faster at 71C, as > active cooling is also on. Is that happening? Temperature never drops below 55°C and so the fan is always running. As far as memory serves me, this has been the case since day one. I have not noticed any difference in fan noise at different temperature levels. Considering how hot this machine is running, I would not be surprised if the fan was always in its "high" setting. > If the fan is running properly, have you checked that the airways > aren't blocked by dust and/or fluff? The laptop has feet of ~5mm height. I have extended that to about 1cm by placing the computer on four stacks of post-it notes. This, again, has been the case since day one. I added a few more millimeters of post-it notes today and cleaned out any dust I could find. This might have improved things slightly but temperature still exceeds 85°C when compiling larger ports. > Maybe Dell don't trust non-Windows OS to take care of passive > cooling? Could be worth seeing if those values come up the same if > you spoof some type of Windows as your OS, as detailed in the ACPI > debugging section? Yes, this is definitely something I will try. I thought that all the magic would be present in the DSDT. But now that I think about it, of course the BIOS could be changing the values read from the GNVS table based on OS. I will try spoofing Vista or Windows 7 and report back my findings. - Bartosz
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