linux-kernel - Re: [PATCH] backlight: do not power off backlight when unregistering

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Date:	Mon, 20 Nov 2006 19:31:36 +0000 (GMT)
From:	James Simmons <jsimmons@...radead.org>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
cc:	Richard Purdie <rpurdie@...ys.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	paulus@...ba.org, Lennart Poettering <mzxreary@...inter.de>,
	Andriy Skulysh <askulysh@...ge.kiev.ua>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org, Antonino Daplas <adaplas@....net>,
	Holger Macht <hmacht@...e.de>,
	Linux Fbdev development list 
	<linux-fbdev-devel@...ts.sourceforge.net>
Subject: Re: [PATCH] backlight: do not power off backlight when unregistering


> The following in-tree (latest linux-2.6 git tree) drivers are desktop/laptop
> devices and likely do not want the "dim and power off backlight on
> backlight_device_unregister" behavior:
> 
> drivers/video/aty/*
> drivers/video/riva/fbdev.c
> drivers/video/nvidia/nv_backlight.c
> drivers/misc/msi-laptop.c

...
 
> I have CC'ed the relevant people (please forgive me any ommissions) for the
> drivers listed above, so they can chime in if their driver should retain the
> "dim and power off backlight on backlight_device_unregister" behaviour.

Hm. In the case of some drivers the hardware state on x86 is set back to 
text mode in some cases. So do we in that case dim the backlight?

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