Comment 26 for bug 1349176

Ok I found another workaround for the fan speed:
- watch echo 255 > /sys/class/hwmon/hwmon2/pwm2

If you set the speed directly using sysfs you don't have the lag, this point out that the lag occurs only when you read the speed of the fan, indeed if try to read the speed with sysfs you still have the lag:
- watch cat /sys/class/hwmon/hwmon2/fan_input2

So If it was possible to avoid the read speed while you set it in i8kutil ... I think this will be a great improvements.

Note:
On my system if I set the fan speed to max speed ( with sysfs or i8kutils ) I never reach the maximum speed: the bios is able to set more high speed ... I'm not sure if it is i8k driver limitation.