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Date: Wed, 06 Apr 2011 16:41:07 -0700
From: Darren Hart <dvhart@...ux.intel.com>
To: "lkml, " <linux-kernel@...r.kernel.org>
CC: Jean Delvare <khali@...ux-fr.org>, Wei Song <Wsong@...oton.com>
Subject: w83795 fan control not working
I haven't been able to control the fan speed using the w83795 driver.
The BIOS "Quiet" setting appears to be braindead as it runs quietly for
a while and then switches to near full throttle for a minute or so and
then returns to the previous state (this is with the system basically
idle). The temperatures (from w83795adg-i2c-0-2f) never reach anything
approaching critical:
Quiet State:
temp1: +83.5°C (high = +127.0°C, hyst = +127.0°C)
(crit = +127.0°C, hyst = +127.0°C) sensor = thermal diode
temp5: +40.0°C (high = +127.0°C, hyst = +127.0°C)
(crit = +75.0°C, hyst = +70.0°C) sensor = thermistor
temp7: +29.5°C (high = +95.0°C, hyst = +92.0°C)
(crit = +95.0°C, hyst = +92.0°C) sensor = Intel PECI
temp8: +25.5°C (high = +95.0°C, hyst = +92.0°C)
(crit = +95.0°C, hyst = +92.0°C) sensor = Intel PECI
Loud State:
...
OK, waited 10 minutes and it didn't want to scream at me. But if memory
serves, there is only a variance of a few degrees before the fans kick
in.
I'm hoping to use pwmconfig/fancontrol with the w83795 driver to restore
some sanity to the fan usage. I tried with V 0.7 on the Ubuntu 10.10
server kernel (vmlinuz-2.6.35-22-server) as well as with the current
version in the linux-2.6.git tree (2.6.39-rc1+). I'm running on the
following hardware with a pair of Intel Xeon X5680 CPUs.
SUPERMICRO MBD-X8DTL-iF-O Motherboard
http://www.supermicro.com/products/motherboard/QPI/5500/X8DTL-iF.cfm
On the following kernel:
linux-2.6.39-rc1+: 99759619b27662d1290901228d77a293e6e83200
With the experimental fan control enabled for the w83795:
$ grep 83795 .config
CONFIG_SENSORS_W83795=m
CONFIG_SENSORS_W83795_FANCTRL=y
The module is loaded:
$ lsmod | grep 83795
w83795 43879 0
pwmconfig reports the following:
---------------------------
Found the following devices:
hwmon0/device is max1617
hwmon1/device is w83627dhg
hwmon2/device is w83795adg <--- So it found the device
Found the following PWM controls:
hwmon1/device/pwm1
hwmon1/device/pwm2
hwmon1/device/pwm3
hwmon2/device/pwm1
hwmon2/device/pwm1 stuck to 125 <--- This doesn't look good.
Manual control mode not supported, skipping hwmon2/device/pwm1.
hwmon2/device/pwm2 <--- Which fans does it control?
Giving the fans some time to reach full speed...
Found the following fan sensors:
hwmon1/device/fan1_input current speed: 0 ... skipping!
hwmon1/device/fan2_input current speed: 0 ... skipping!
hwmon1/device/fan3_input current speed: 0 ... skipping!
hwmon1/device/fan5_input current speed: 0 ... skipping!
hwmon2/device/fan1_input current speed: 0 ... skipping!
hwmon2/device/fan2_input current speed: 1931 RPM <-- cpu fan
Note, the CPUs are very close together and to the rear chassis fan, this
prevents me from installing both CPU fans. I opted to keep the larger
(quieter) chassis fan adjacent to the second CPU over the second smaller
CPU fan.
hwmon2/device/fan3_input current speed: 0 ... skipping!
hwmon2/device/fan4_input current speed: 2652 RPM <-- small chassis fan
hwmon2/device/fan5_input current speed: 1814 RPM <-- large chassis fan
hwmon2/device/fan6_input current speed: 0 ... skipping!
---------------------------
The fans didn't change speed during the pwmconfig run. I did allow it to
switch all the pwm controls to manual mode.
Fans 2, 4, and 5 below should be connected via the w83795 driver as far as I can tell:
$ rage-ipmi.sh sensor
FAN 1 | na | RPM | na | na | na | na | na | na | na
FAN 2 | 1936.000 | RPM | ok | 400.000 | 576.000 | 784.000 | 33856.000 | 34225.000 | 34596.000
FAN 3 | na | RPM | na | na | na | na | na | na | na
FAN 4 | 2704.000 | RPM | ok | 400.000 | 576.000 | 784.000 | 33856.000 | 34225.000 | 34596.000
FAN 5 | 1764.000 | RPM | ok | 400.000 | 576.000 | 784.000 | 33856.000 | 34225.000 | 34596.000
FAN 6 | na | RPM | na | na | na | na | na | na | na
CPU1 Vcore | 0.952 | Volts | ok | 0.776 | 0.800 | 0.824 | 1.352 | 1.376 | 1.400
CPU2 Vcore | 0.952 | Volts | ok | 0.776 | 0.800 | 0.824 | 1.352 | 1.376 | 1.400
CPU1 DIMM | 1.520 | Volts | ok | 1.288 | 1.312 | 1.336 | 1.656 | 1.680 | 1.704
CPU2 DIMM | 1.520 | Volts | ok | 1.288 | 1.312 | 1.336 | 1.656 | 1.680 | 1.704
+1.5 V | na | Volts | na | na | na | na | na | na | na
+5 V | 5.056 | Volts | ok | 4.416 | 4.448 | 4.480 | 5.536 | 5.568 | 5.600
+5VSB | 5.056 | Volts | ok | 4.416 | 4.448 | 4.480 | 5.536 | 5.568 | 5.600
+12 V | 12.137 | Volts | ok | 10.600 | 10.653 | 10.706 | 13.250 | 13.303 | 13.356
-12 V | -11.904 | Volts | ok | -13.650 | -13.456 | -13.262 | -10.546 | -10.352 | -10.158
VTT | 1.112 | Volts | ok | 0.808 | 0.816 | 0.824 | 1.320 | 1.336 | 1.352
+3.3VCC | 3.264 | Volts | ok | 2.880 | 2.904 | 2.928 | 3.648 | 3.672 | 3.696
+3.3VSB | 3.264 | Volts | ok | 2.880 | 2.904 | 2.928 | 3.648 | 3.672 | 3.696
VBAT | 3.096 | Volts | ok | 2.880 | 2.904 | 2.928 | 3.648 | 3.672 | 3.696
CPU1 Temp | 0x1 | discrete | 0x0000| na | na | na | na | na | na
CPU2 Temp | 0x1 | discrete | 0x0000| na | na | na | na | na | na
System Temp | 40.000 | degrees C | ok | -9.000 | -7.000 | -5.000 | 75.000 | 77.000 | 79.000
P1-DIMM1A | 37.000 | degrees C | ok | -9.000 | -7.000 | -5.000 | 65.000 | 70.000 | 75.000
P1-DIMM2A | na | degrees C | na | na | na | na | na | na | na
P1-DIMM3A | na | degrees C | na | na | na | na | na | na | na
P2-DIMM1A | 37.000 | degrees C | ok | -9.000 | -7.000 | -5.000 | 65.000 | 70.000 | 75.000
P2-DIMM2A | na | degrees C | na | na | na | na | na | na | na
P2-DIMM3A | na | degrees C | na | na | na | na | na | na | na
Chassis Intru | 0x0 | discrete | 0x0000| na | na | na | na | na | na
PS Status | 0x1 | discrete | 0x01ff| na | na | na | na | na | na
dmesg reports:
$ dmesg | grep 83795
[ 12.643929] i2c i2c-0: Found w83795adg rev. B at 0x2f
[ 12.883789] w83795 0-002f: PECI agent 1 Tbase temperature: 100
[ 12.903779] w83795 0-002f: PECI agent 2 Tbase temperature: 100
[ 2288.932629] w83795 0-002f: Failed to read from register 0x030, err -6
[ 2613.292773] w83795 0-002f: Failed to write to register 0x040, err -6
[ 2693.333461] w83795 0-002f: Failed to read from register 0x01e, err -11
Am I doing something wrong? Can I provide any additional information to
help narrow down what might be wrong?
Thanks!
--
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel
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