Hi Jean: You asked about this on IRC last Sunday, and unfortunately I gave you some bad information. Turns out it is trivial after all. I completely forgot about libsensors error.h. Index: lib/access.c =================================================================== --- lib/access.c (revision 4253) +++ lib/access.c (working copy) @@ -460,6 +460,8 @@ continue; } if ((res = sensors_set_feature(name, feature_nr, value))) { + sensors_parse_error("Can't set feature.", + chip->sets[i].lineno); err = res; continue; } Regards, -- Mark M. Hoffman mhoffman at lightlink.com