On Sat, Aug 30, 2014 at 04:10:45PM +0200, Ulrik De Bie wrote:

The detection of crc_enabled is known to fail for Fujitsu H730. A DMI
blacklist is added for that, but it can be expected that other laptops
will pop up with this.

Here a sysfs knob is provided to alter the behaviour of crc_enabled.
Writing 0 or 1 to it sets the variable to 0 or 1.
Writing 2 to it will perform the detection and set the variable to 0
or 1 according to the result of the detection.
Reading it will show the crc_enabled variable (0 or 1).

This is over-complicated, please make it straight bool (0/1). If one
wants to redetect it can be done by unbinding and rebinding driver
through sysfs (either at driver level or serio - drvctl attribute -
level).

Thanks.

-- 
Dmitry