Mario, are you able to check if instance number passed to wmi_evaluate_method in following dell WMI drivers is correct and should be really 1? I suspect that it should be zero, as instance number is indexed from zero. There is no comment in those dell WMI drivers why it is 1, nor what 1 means. Ideally it needs to be checked in ACPI byte code, MOF file and WDG dump. On Wednesday 14 June 2017 17:46:54 Pali Rohár wrote: > Function wmi_evaluate_method: ... > alienware-wmi.c: > instance=1 /* no comment why, guid=A70591CE-A997-11DA-B012-B622A1EF5492 */ > instance=1 /* no comment why, guid=A80593CE-A997-11DA-B012-B622A1EF5492 */ > instance=1 /* no comment why, guid=A70591CE-A997-11DA-B012-B622A1EF5492 */ ... > dell-wmi-led.c: > instance=1 /* no comment why, guid=F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396 */ -- Pali Rohár pali.rohar@xxxxxxxxx