linux-kernel - Re: 2.6.21-rc2 radeon backlight

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Message-Id: <20070302122920.a2967ebf.akpm@linux-foundation.org>
Date:	Fri, 2 Mar 2007 12:29:20 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alex Romosan <romosan@...orax.lbl.gov>
Cc:	linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net,
	Richard Purdie <rpurdie@...ys.net>
Subject: Re: 2.6.21-rc2 radeon backlight

On Fri, 02 Mar 2007 09:24:03 -0800
Alex Romosan <romosan@...orax.lbl.gov> wrote:

> Andrew Morton <akpm@...ux-foundation.org> writes:
> 
> > On Wed, 28 Feb 2007 08:32:43 -0800
> > Alex Romosan <romosan@...orax.lbl.gov> wrote:
> >
> >> the backlight on my thinkpad still (2.6.20 worked fine) doesn't come
> >> on if i have the radeon backlight enabled. without it, i guess it's
> >> the ibm acpi modules that controls the backlight and it seems to work
> >> fine.
> >> 
> >
> > Unclear. Are you saying that the backlight comes on OK if you use
> > the IBM acpi module?
> 
> yes, if i disable the radeon backlight and use the ibm acpi module,
> than the backlight works. if i enable the radeon backlight, the screen
> stays dark and i can't turn it on (i tried using radeontool to control
> it but nothing happened).

Richard, is this actually a bug, or is it a config error or something like that?

And should we track it as a post-2.6.20 regression?
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