Re: permissions with udev-177, systemd38

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On Mon, Jan 16, 2012 at 10:47 AM, Allin Cottrell <cottrell@xxxxxxx> wrote:
> After updating to udev-177 + systemd38 I'm hitting a permissions problem
> with running the thinkfan program. From syslog:
> <hostname> thinkfan: thinkfan 0.7.3 starting...
> <hostname> thinkfan: \
> /sys/class/hwmon/hwmon2/device/pwm1_enable: \
> Operation not permitted

A little more information on this: to control the Thinkpad fan
speed, the thinkpad_acpi module must be loaded with the
option fan_control=1. I have a line that arranges that in
/etc/modprobe.d/modprobe.conf. Apparently this is not
respected by kmod. I tried the experiment of

modprobe -r thinkpad_acpi
modprobe thinkpad_acpi

(using module-init-tools, that is) and now thinkfan works again.
So my next question is, how to ensure that kmod picks up on
the option. I guess I ought to be able to find that myself.

Allin Cottrell
Department of Economics
Wake Forest University
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