Comment 33 for bug 1179282

I found some great workaround on my system so I'm sharing them here, the following info can also be useful to fix the issue in i8kutils.

I'm on ubuntu 14.10 using last i8kutils version version `i8kutils-1.42-45`.

The lag issue is triggered *only* when the system read the fan speed ( i8kutils read the speed also when you set it, that is way is lagging )

Here some workaround:

- Set the fan speed using sysfs avoid the lag:
`watch echo 255 > /sys/class/hwmon/hwmon2/pwm2`

- Fix lag in sensors and psensor:
add this file `/etc/sensors.d/dell.conf` with the following content:
############
# Disable the fan speed sensor read
chip "i8k-virtual-0"
 ignore fan2
############

How to reproduce the lag:
`watch cat /sys/class/hwmon/hwmon2/fan_input2`

Suggested fix for the i8kutils:
So If it was possible to avoid the read speed while you set it in i8kutil, I think this will make the trick

I hope it helps ;)