[ltp] T420 /proc/acpi/ibm/video not working

David Woodfall linux-thinkpad@linux-thinkpad.org
Sat, 7 Feb 2015 11:59:21 +0000


When I cat /proc/acpi/ibm/video it shows every monitor disabled, even when
int and ext are on.

Echoing anything there has no effect at all. It all worked fine in my
T42. What I would like to do is just use the video_switch command.

Is this a known problem, and is there a workaround?