Turn off laptop screen when using external HDMI monitor

Libretro Lakka
#1

I installed Lakka (nightly 21205) on an old Dell e1505 laptop (64-bit 2-core Intel T7400 cpu, 2GB ram, ATI X1400 gpu). I use an external VGA->HDMI adapter to connect the system to a television. (I mention the particular adapter in another thread, in case anyone finds this thread while looking for such a device in the future.)

The laptop stays powered-on when the lid is closed, which is good.

However, the laptop screen stays on.

How do I configure Lakka (or retroarch) to disable the laptop’s built-in screen? I’d be satisfied with disabling it either permanently (via config settings) or conditionally (as in only when the external HDMI adapter is connected)

#2

courtesy of “duduke” in another thread:

You can add this parameter video=LVDS-1:d to the kernel boot command

I hadn’t thought of that, and it works!

In addition to the kernel boot params supported by OpenELEC, is there a list of Lakka-supported kernel boot parameters?

#3

Dell and Apple monitors have similar pipeline architecture except for the display panel which is better in Apple monitors. And you can ask for the correct HDMI cables from apple customer service and then purchase it.