Ben Hutchings writes ("Re: Bug#867776: linux-image-4.9.0-3-amd64: spurious ACPI 
lid open event on wakeup"):
> Control: tag -1 upstream
...
> The change can be reverted with a module parameter:
> 
>     options button lid_init_state=method

You are a fount of knowledge!  I will try this and report back.

> As I understand it, neither approach works in all cases due to firmware
> bugs, but the current default works in more cases.
> 
> Related: https://bugzilla.kernel.org/show_bug.cgi?id=195455

Thanks for the link, which I will read.

Ian.

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