[SOLVED] Module it87.ko Won't Load

bilbod · 06-18-2017, 09:07 PM

Slackware64 14.2.

My CPU needs the kernel module it87.ko to read the CPU temp correctly.

Code:

grep SENSORS_IT87 /usr/src/linux/.config 
CONFIG_SENSORS_IT87=m

locate it87.ko
/lib/modules/4.4.38/kernel/drivers/hwmon/it87.ko

modprobe it87
modprobe: ERROR: could not insert 'it87': Device or resource busy

it87 is compiled into the kernel as a module, the module is where it should be but I cannot load it.

Anybody know a solution?

55020 · 06-18-2017, 10:26 PM

Maybe you need to add 'acpi_enforce_resources=lax' to your kernel command line in lilo.conf or grub.

But some people warn against that, for example http://hansdegoede.livejournal.com/7932.html

1337_powerslacker · 06-18-2017, 10:30 PM

Quote:

Originally Posted by bilbod

Slackware64 14.2.

My CPU needs the kernel module it87.ko to read the CPU temp correctly.

Code:

grep SENSORS_IT87 /usr/src/linux/.config 
CONFIG_SENSORS_IT87=m

locate it87.ko
/lib/modules/4.4.38/kernel/drivers/hwmon/it87.ko

modprobe it87
modprobe: ERROR: could not insert 'it87': Device or resource busy

it87 is compiled into the kernel as a module, the module is where it should be but I cannot load it.

Anybody know a solution?

I Googled your error message and got the following: https://bbs.archlinux.org/viewtopic.php?id=81925

Hope this helps. Happy Slacking!

EDIT: 55020 beat me to it.

bilbod · 06-19-2017, 11:21 AM

Quote:

Originally Posted by 55020

Maybe you need to add 'acpi_enforce_resources=lax' to your kernel command line in lilo.conf or grub.

But some people warn against that, for example http://hansdegoede.livejournal.com/7932.html

I already Googled this extensively. All the info related to it is old (6-8 years) and related to 2.6 kernel.

I felt uncomfortable using acpi_enforce_resources=lax because of the potential hardware damage it might cause. I did try it for a short time and it87 loaded and sensors gave me 2 additional temp readings 25°C and 31°C. It is not clear what they are the temperature of?

I also tried disabling acpi in the kernel (acpi=off in lilo append). The system booted but the X server did not work.

Hardware:

BIOSTAR TA970XE mobo
AMD FX(tm)-4100 Quad-Core CPU

BIOS Temp readings:
CPU 41°C
SYS 31°C

This is a quote from from an article on Tom's Hardware:

"...the CPU temps shown in the BIOS are high because the CPU in the BIOS runs at its full clock speed

On my PC, I'm seeing ~50 degrees celsius in the BIOS / UEFI, and just 25 degrees celsius while idling on Windows as shown by Real Temp.

Here is why: In the BIOS, the CPU is running at its full clock speed [so ~4GHz on my i7 6700K]. When idling on Windows however, the CPU clock goes all the way down to just 800MHz. At this reduced frequency, the CPU consumes much less power, and also generates much less heat.

Then, running a CPU stress test automatically gets the CPU to increase its clock back to the ~4GHz, and I'm then getting temperatures of about 50 to 55 degrees celsius at 100% load.

So, don't panic because you're seeing high temps in the BIOS."

ACPI temp shows 27°C on taskbar monitor.
Note: Started at 31°C but in a few seconds dropped to 28°C

Code:

acpi -t
Thermal 0: ok, 27.0 degrees C

cat /sys/class/thermal/thermal_zone0/temp
28000

Code:

sensors:
k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +13.9°C  (high = +70.0°C)
                       (crit = +90.0°C, hyst = +87.0°C)

cat /sys/class/hwmon/hwmon0/temp1_input
14000

Code:

sensors:
nouveau-pci-0100
Adapter: PCI adapter
temp1:        +45.0°C  (high = +95.0°C, hyst =  +3.0°C)
                       (crit = +105.0°C, hyst =  +5.0°C)
                       (emerg = +135.0°C, hyst =  +5.0°C)

cat /sys/class/hwmon/hwmon2/temp1_input 
44000

According to the AMD docs, the k10temp is a relative temperature. It is the difference between the CPU temp and the temp at which the CPU turns the cooler fan on.

I grouped the sensor temps with the /sys/class temps they seem to be associated with.

Note: The acpi program has not been updated for 4 years. The homepage no longer exists and the project might be orphaned.

upnort · 06-19-2017, 11:41 AM

To offer some nominal consolation, I have been using the acpi_enforce_resources=lax boot parameter for years. The motherboard is an Asus M3N78-EM with a dual core AMD Athlon 5050e and 8GB RAM. I currently run 14.2 64-bit and started using the boot parameter when first introduced with the 2.6 kernel. To my observation and knowledge, I have suffered no consquences from using the boot parameter. The standard disclaimer applies: YMMV.