15" T61 lid sensor

[Ashe Too]

I have a T61 with the 15" screen. When I put the machine in the dock, which is connected to two identical monitors. I have the graphics set up to extend the desktop to the second monitor, and it works fine...except that when I first dock the notebook and boot up, it usually does not put images on both screens. Sometimes, it treats the second screen as the second screen and extends the desktop, but does not put any image on the primary screen. After experimenting quite a bit, I've noticed that if I press on the lid, it will either give output to both screens, go into sleep mode, flicker the second screen, etc. I.e., whatever mechanism tells the computer that the lid is closed seems not to be functioning correctly. So, does anyone know how the T61 senses that the lid is closed?

[SHoTTa35]

It should be a magnet by the "Lenovo T61" area or somewhere along the bottom there. That trips the ACPI power management in the OS and it puts it to sleep.