On Sun, 2010-06-13 at 10:27 +0800, Wan, Huaxu wrote: > >On Wed, 2010-06-02 at 23:10 +0300, Maxim Levitsky wrote: > >> On Wed, 2010-06-02 at 19:34 +0300, Maxim Levitsky wrote: > >> > On Mon, 2010-05-31 at 09:39 +0800, Huaxu Wan wrote: > >> > > On 08:39 Sat 29 May, Maxim Levitsky wrote: > >> > > > On Fri, 2010-05-07 at 17:59 +0800, Huaxu Wan wrote: > >> > > > > The MSR IA32_TEMPERATURE_TARGET contains the TjMax > >value in the newer > >> > > > > processers. > >> > > > > >> > > > I know that TjMax on my system is 85, and now coretemp > >reports wrong > >> > > > temperatures. > >> > > > First of all BIOS using stupid tricks actualy reports > >CPU temperature > >> > > > through ACPI, and assuming it was correct TjMax is 85. > >> > > > It also shuts down the system if I 'lie' to it that > >cpu temperature is > >> > > > 85C. > >> > > > >> > > From the list at [1], the TjMax(Tjunction) of T5450 is > >100C. Does anyone > >> > > here can make a double check? > >> > > > >> > > [1] > >http://ark.intel.com/Product.aspx?id=30787&processor=T5450&spec > >-codes=SLA4F > >> > > >> > This is very interesting. > >> > > >> > With TjMax 85C, the CPUs idle temperature is reported at > >around 45~50C > >> > GPU temperature that is around 50C > >> > > >> > BIOS also reports 45~50C. > >> > > >> > BIOS hooks an SMI to CPU thermal report, and stores the > >temperature it > >> > read in ram, then ACPI code reads it, reports and passes to the EC > >> > (embedded controller). > >> > > >> > If I write myself 85 to embedded controller, systems shuts down. > >> > (values less that 85, eg 84 don't shut system). > >> > >> > >> Another clue is that right after resume from ram, after long delay > >> (~hour) the displayed temperature with TjMax 85 is 33C. Since room > >> temperature here is around 27C, this seems more plausible that > >> 33 + 15 = 48C > > > > > >Any update? > > I'm occupied by other things, sorry for slow response. But, as said in a > spec, I can't remember which one now, there are too many, the relative > value read from DTS is accurate approaching to TjMax. The accuracy > deteriorates to +-10C at 50C. Any DTS reading below 50C should be > considered to indicate only a temperature below 50C and not a specific > temperature. > > So, the value around 50C can't be taken as real chip temperature. I > would like this issue could be confirmed by more users to avoid it as a > particular case. At the meantime, I still looking for a laptop with T5450, > this may take some time. > > Thanks > Huaxu Any update? Best regards, Maxim Levitsky _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
