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

Henrique de Moraes Holschuh linux-thinkpad@linux-thinkpad.org
Sun, 8 Feb 2015 19:41:21 -0200

On Sat, 07 Feb 2015, David Woodfall wrote:
> 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.

Lenovo abandoned these interfaces a long time ago.

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

None. You have to use something else to video switch :-(

  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh