linux-kernel - Re: [Linux-fbdev-devel] no backlight on radeon after recent kernel "upgrade"s

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Message-ID: <Pine.LNX.4.64.0702221549530.29542@pentafluge.infradead.org>
Date:	Thu, 22 Feb 2007 15:55:24 +0000 (GMT)
From:	James Simmons <jsimmons@...radead.org>
To:	Joel Becker <Joel.Becker@...cle.com>
cc:	Yaroslav Halchenko <lists@...russian.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [Linux-fbdev-devel] no backlight on radeon after recent kernel
 "upgrade"s


> On Thu, Feb 22, 2007 at 01:11:18AM +0000, James Simmons wrote:
> > > *$> grep BACKLIGH /boot/config-2.6.20 
> > > # CONFIG_FB_BACKLIGHT is not set
> > > CONFIG_BACKLIGHT_LCD_SUPPORT=y
> > > CONFIG_BACKLIGHT_CLASS_DEVICE=m
> > > CONFIG_BACKLIGHT_DEVICE=y
> > 
> > You need to explictly enable the backlight for your fbdev driver. It 
> > doesn't do the selecting magically for you.
> > Jus do a make "favorite"config and go to the fbdev menu and select the 
> > backlight option for your fbdev driver.
> 
> 	I would think that we'd always want to enable the backlight.
> How are people supposed to Just Know that the kernel defaults to a black
> LCD?

I just tested various confirations of backlight support. Backlight is 
ALWAYS selected by default when you select a particular fbdev driver that 
has backlight support. You just have the option to turn it off if you 
want. These problems are showing up because of stale .config files.

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