linux-kernel - Re: [Bug #12401] 2.6.28 regression: xbacklight broken on ThinkPad X61s

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Date:	Mon, 16 Feb 2009 13:37:40 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Len Brown <len.brown@...el.com>,
	Thomas Renninger <trenn@...e.de>,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: [Bug #12401] 2.6.28 regression: xbacklight broken on ThinkPad
	X61s


* Matthew Garrett <mjg59@...f.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
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