The solution (for me, inspiron 9400) is on https://github.com/vitorafsr/i8kutils
Add "dell-smm-hwmon" to /etc/modules and verify you have "options dell-smm-hwmon restricted=0" in /etc/modprobe.d/dell-smm-hwmon.conf
The solution (for me, inspiron 9400) is on https:/ /github. com/vitorafsr/ i8kutils
Add "dell-smm-hwmon" to /etc/modules d/dell- smm-hwmon. conf
and verify you have "options dell-smm-hwmon restricted=0" in /etc/modprobe.