Re: [PATCH] platform/x86: thinkpad-acpi: Add X1 Fold keyboard attachment detection

[Pit Henrich]

On Mon, 16 Mar 2026 at 14:24, Hans de Goede <hansg@xxxxxxxxxx> wrote:
> Looking at pictures of the Fold 16 gen 1, I assume this sysfs attr will return 1 when the keyboard
> is clicked on one half of the foldable screen, covering that half so that the laptop resembles
> a classic clamshell design in this mode. Since this is actually covering half the screen I think
> that keyboard_attached_on_screen actually is a good name :)

Yes, exactly right :)

The keyboard can also be used when it is not attached, via Bluetooth.
And there is actually another way that Lenovo intended the keyboard
to be attached, but that way is not detectable (and wouldn't affect
any functional behavior anyway).

The intended userspace use case for this sysfs attr is to detect when
the keyboard is attached on the lower half of the display, so that UI
elements can be moved up and only the top half of the screen is used.
It's a very unique use case for sure.

Greetings
Pit