linux-kernel - Re: THINKPAD_ACPI_INPUT

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Date:	Wed, 1 Aug 2007 18:03:03 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
cc:	"Michael S. Tsirkin" <mst@....mellanox.co.il>,
	Len Brown <len.brown@...el.com>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	linux-kernel@...r.kernel.org, ibm-acpi-devel@...ts.sourceforge.net,
	Richard Hughes <hughsient@...il.com>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: THINKPAD_ACPI_INPUT_ENABLED seems regressive

On Wed, 1 Aug 2007, Henrique de Moraes Holschuh wrote:
> On Wed, 01 Aug 2007, Michael S. Tsirkin wrote:
> > Forcing the selection at compile-time isn't such a great idea IMHO.
> > Isn't there a way to support both old and new userspace?
> 
> It only afects the *defaults* of various driver knobs that can be freely
> modified at runtime:
> 
> without THINKPAD_ACPI_INPUT_ENABLED:
> 	hotkey_enable = 0
> 	hotkey_mask unchanged from whatever is already set
> 
> 	hot keys from ibm-acpi 0.14 are mapped to KEY_UNKNOWN, and thus will
> 	generate ACPI events if hotkey_enabled is set to 1.
> 
> with THINKPAD_ACPI_INPUT_ENABLED:
> 	hotkey_enable = 1
> 	hotkey_mask = hotkey_recommended_mask
> 
> 	most hot keys are mapped to something other than KEY_UNKNOWN, and
> 	thus will not generate ACPI events but rather input layer events.
> 
> You should select whichever works better with your userspace.

That reminds me of something else odd that I noticed.

While I had CONFIG_THINKPAD_ACPI_INPUT_ENABLED=y and was trying
to get Fn+F4 to give me Suspend to RAM somehow, I did try setting
/sys/blah/blah/blah/hotkey_enable to 0.

That caused the Fn+F4 key to become active, except that it wanted
to do Hibernation to Disk instead: a window popped up to tell me
(IIRC) that my kernel command line didn't have a good resume=

Hugh
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