Comment # 1 on bug 1181890 from Jean Delvare

We have a combination of 2 bugs here. First bug is in the amdgpu driver, which
exposes a fan1_input hwmon attribute which returns -EINVAL when read. If the
fan speed can't be read then the attribute shouldn't be exposed in the first
place.

Second bug is that the pwmconfig script doesn't cope with this error case and
continues as if everything was OK.

I can't reproduce the bug on my systems at the moment. I'll tweak the amdgpu
driver to simulate the error on my system, then I can reproduce the pwmconfig
bug and fix it.