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

[Jagged O'Neill]

On Sun, Feb 08, 2015 at 04:46:15PM +0000, Timothy Murphy wrote:
> On Saturday 07 February 2015 12:14:45 David Woodfall wrote:
> 
> > commands:       lcd_enable, lcd_disable
> > commands:       crt_enable, crt_disable
> > commands:       dvi_enable, dvi_disable
> > commands:       auto_enable, auto_disable
> > commands:       video_switch, expand_toggle
> 
> I get the same output on my T520 under Fedora-21/KDE
> in /proc/acpi/ibm/video.
> But I have no idea what it means.
> How does one give the command lcd_enable, for example,
> and what effect does it have?

You echo those commands into the very same file. See
  https://www.kernel.org/doc/Documentation/laptops/thinkpad-acpi.txt
(some lines above the middle of the document).

Don't know if it's worth it, however. When I use an external display
with my TP, I prefer to let xrandr manage them.

Regards,
Jagged

-- 
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