Phenom II 975 BE shows 0 celsius
avg at FreeBSD.org
Mon Aug 1 14:25:57 UTC 2011
on 01/08/2011 03:28 Mario Lobo said the following:
> Hi to all
> In my desktop machine, I had an AM2+ ASROCK mobo with Phenom II 955 BE that
> showed each core temperature perfectly under FBSD 8-STABLE, via
> dev.cpu.x.temp. amdtemp.ko loaded.
> Unfortunately this Mobo died and only found AM3 boards for which my phenom 955
> doesn't fit. So I got an ASUS M4A88T-V EVO with a Phenom II 975 BE.
> Funny thing. An AM3 phenom II fits on an AM2 board but an AM3 board doesn't
> accept an AM2/AM2+ phenom II :(.
> Anyway, now, under the very same system, it shows 0 degrees on dev.cpu.x.temp
> for all cores.
Sorry, I've got lost in all the config changes. So what system do you have now?
Can please also provide CPU-related information from dmesg?
> I've been looking through k8temp and amdtemp src code. I am definitely not
> sure of this but I believe something might have happened to those:
> From k8temp.h
> K10_THERM_REG 0xa4
> K10_THERMTRIP_REG 0xe4
> K10_CURTMP(val) (((val) >> 21) & 0xfff)
> K10_THERMTRIP(val) ((val >> 1) & 1)
> From amdtemp.c
> * Register control (K8 family)
> #define AMDTEMP_REG0F 0xe4
> #define AMDTEMP_REG_SELSENSOR 0x40
> #define AMDTEMP_REG_SELCORE 0x04
> * Register control (K10 & K11) family
> #define AMDTEMP_REG 0xa4
> Output of k8temp -dn:
> CPUID: Vendor: AuthenticAMD, 0x100f43: Model=04 Family=f+1 Stepping=3
> Advanced Power Management=0x1f9
> Temperature sensor: Yes
> Frequency ID control: No
> Voltage ID control: No
> THERMTRIP support: Yes
> HW Thermal control: Yes
> SW Thermal control: Yes
> 100MHz multipliers: Yes
> HW P-State control: Yes
> TSC Invariant: Yes
> I keep a small win7 partition to test little things like this and see if the
> same thing happens there, and it doesn't, so I concluded that the sensors are
> there and are working.
> One thing is worth noting though. I have used a free gadget that shows
> activity/temp for each core. It worked fine with the previous MB/CPU.That ALSO
> stopped working with this new MB. Like FBSD, it shows 0 degrees for any core
> too, although it correctly displays each core load.
Most likely that gadget just re-uses OS-provided information.
> The only windows tool that correctly shows the temperature are the ASUS tools
> that came with the mobo.
> Other than that, everything is working fine! The only thing I had to fix was
> the fstab ada location.
> I know this is not a big thing but I got accustomed to keeping an eye on those
> I have googled for a few days now searching for Thermal register address or
> offsets for the Phenom II 975 BE, or anything related to this problem and
> found nothing. Every search on AMD site was fruitless. I could not find a
> single bit of tech info on this processor there, or any other tech info for
> that matter.
> Would any one have any pointers/clues/suggestions on this?
I would try to add some printfs (or used dtrace - whichever is easier for you) to
see what's going on. Or you can even use pciconf to directly sneak a peek at
what's reported by the hardware, e.g.:
# pciconf -r pci0:0:24:3 0xa4
You can read the BKDG to see how to interpret the value - search for F3xA4. See
F3xE4 for offset calculation.
Hopefully you should be able to see if hardware reports sane value and how the
amdtemp ends up reporting 0°C.
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