[ltp] How is the t440p reconizing, whether the case is closed?

[Ivo Ugrina]

On 02/23/2014 10:42 AM, Marius Gedminas wrote:
> On Sun, Feb 23, 2014 at 09:58:34AM +0100, Frank Lanitz wrote:
>> I've recognized an issue where from time to time the thinkpad is
>> going to standby (-> config on my Xfce when closing the case).
>> This is happen, when I'm moving the book a little. It's quiet
>> annoying when sitting in the train. Anybody able to tell me, how
>> the case-closed event is getting triggerd?
> 
> I had the opposite problem on my T61: the lid sensor would
> spontaneously trigger waking up my laptop while it was in my
> backpack.
> 
> I found that I could disable the lid as a wakeup source by doing
> 
> echo LID > /proc/acpi/wakeup
> 
> in /etc/rc.local
> 
> 
> Disabling suspend on lid closure is something that can be done in
> the desktop environment.  I use GNOME, not Xfce, so I cannot tell
> you the exact location of that option, but I'm sure there must be
> one somewhere.
> 
> Marius Gedminas
> 

Linux recieves an ACPI event as Marius said. On Debian ACPI events are
handled with acpi-support so appropriate adjustment of
/etc/acpi/events/lidbtn
/etc/acpi/lid.sh
will enable you to use lid only on closing/opening or both.

For example, to test if lid is closed:
$ grep -q closed /proc/acpi/button/lid/*/state