Hi Mark, sorry to butt in mid thread.  Having this same issue on a
Lenovo T61.  The directory you reference below is
/proc/acpi/button/lid/LID on this laptop with Beowulf newly updated.  I
can confirm that state does change with lid position. xfce-power-manager
debug does not notice the lid change though it does backlight changes,
and keyboard based suspends...

toggling between elogind lid switch settings seems to make no difference.

Apologies if I have breached etiquette here.

Patrick



On 2020-06-04 08:52, Mark Hindley wrote:

> Michaela,
>
> Thanks.
>
> One other thing that has occurred to me: is the kernel finding and
enabling the
> lid switch? What make of laptop is it? Does
/proc/acpi/button/lid/LID0/ exist?
>
> It could be a problem at the kernel/harware level.
>
> Mark
>