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Date: Mon, 16 Feb 2009 13:37:40 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
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       Andi Kleen <ak@linux.intel.com>, Len Brown <len.brown@intel.com>,
       Thomas Renninger <trenn@suse.de>, Zhang Rui <rui.zhang@intel.com>
Subject: Re: [Bug #12401] 2.6.28 regression: xbacklight broken on ThinkPad
	X61s
Message-ID: <20090216123740.GB7047@elte.hu>
References: <sTyoMUwdm9B.A.QCH.U40lJB@chimera> <ROx6X68CGJG.A.FEB.M50lJB@chimera> <20090215134409.GC21670@srcf.ucam.org> <200902151538.29766.rjw@sisk.pl> <20090215221647.GA15392@dose.home.local> <20090216011600.GA28929@srcf.ucam.org>
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* Matthew Garrett <mjg59@srcf.ucam.org> wrote:

> On Sun, Feb 15, 2009 at 11:16:47PM +0100, Tino Keitel wrote:
> 
> > I think if it works without DRI in 2.6.27 and doesn't work in 2.6.28,
> > it isn't a configuration error, but a real regression.
> 
> It only worked by accident without DRM support, since you were using the 
> ATI codepath in the firmware rather than the Intel one. That bug's been 
> fixed, [...]

Which precise commit ID is that?

> [...] so now you're following the Intel codepath - unfortunately 
> there's no way to do that without kernel-level graphics support, which 
> means DRM.

Tino, does it all work fine if CONFIG_DRM is enabled?

	Ingo