Phenom II 975 BE shows 0 celsius
lobo at bsd.com.br
Mon Aug 1 00:28:39 UTC 2011
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.
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:
K10_CURTMP(val) (((val) >> 21) & 0xfff)
K10_THERMTRIP(val) ((val >> 1) & 1)
* 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.
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
Would any one have any pointers/clues/suggestions on this?
FreeBSD since 2.2.8 [not Pro-Audio.... YET!!] (99% winblows FREE)
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