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Message-ID: <20090216123740.GB7047@elte.hu>
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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