WGX-550e: mbmon stops reporting temperatures.

[sthames42]

Having a problem with both mbmon and WGXepc reporting temp of 255.
Running mbmon returns reasonable temps for a while and suddenly starts reporting this:

Temp.= 255.0,  0.0,  0.0; Rot.=    0,    0,    0
Vcore = 4.08, 4.08; Volt. = 4.08, 6.85, 15.50,  6.07,  5.11

When I cancel mbmon and run it again, I get:

ioctl(smb0:open): No such file or directory
No Hardware Monitor found!!
InitMBInfo: Bad file descriptor

WGXepc -t reports good temps and then nothing but 255.
Only way to fix this is to reboot.
I'm assuming the SuperIO chip got itself hosed somehow. Is there any way to reset or reboot the chip?

This is on two X-Core 550e boxes and the default SL6N7 Banias chips have been replaced with SL7EP Dothan chips according to https://doc.pfsense.org/index.php/PfSense_on_Watchguard_Firebox#Further_Enhancements_3.
All dip switches set correctly. No other changes (powerd/speedstep) were made.

[stephenw10]

I'll reply in other thread where this post is duped. It's best to try and keep all info in one place, or at least as few places as possible.  ;)

Steve