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Date: Wed, 11 Oct 2006 08:04:12 +0100 From: Matthew Garrett <mjg59@...f.ucam.org> To: Arjan van de Ven <arjan@...radead.org> Cc: Yu Luming <luming.yu@...il.com>, Matt Domsch <Matt_Domsch@...l.com>, Pavel Machek <pavel@....cz>, Andrew Morton <akpm@...l.org>, Alessandro Guido <alessandro.guido@...il.com>, linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org, len.brown@...el.com, jengelh@...ux01.gwdg.de, gelma@...ma.net, ismail@...dus.org.tr Subject: Re: [PATCH 2.6.18-mm2] acpi: add backlight support to the sony_acpi driver On Wed, Oct 11, 2006 at 08:59:04AM +0200, Arjan van de Ven wrote: > it'd also be nice if the linux-ready firmware developer kit had a test > for this, so that we can offer 1) a way to test this to the bios guys > and 2) encourage adding/note the lack easily Sure. Reading /proc/acpi/video/*/*/info should tell you whether a device is an LCD or not. The brightness file should then contain a list of available brightnesses, and writing one into there should change the screen value. There's a patch somewhere that ports this to the /sys/class/backlight infrastructure, but I don't think it's applied yet. I'd write a test up for you, but I don't actually seem to have any hardware that implements this properly. Tch. -- Matthew Garrett | mjg59@...f.ucam.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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