linux-kernel - Re: [2/2] 2.6.21-rc7: known regressions

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Date:	Mon, 16 Apr 2007 14:54:07 +0800
From:	"Antonino A. Daplas" <adaplas@...il.com>
To:	Dave Jones <davej@...hat.com>
Cc:	Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Richard Purdie <rpurdie@...ys.net>
Subject: Re: [2/2] 2.6.21-rc7: known regressions

On Mon, 2007-04-16 at 02:29 -0400, Dave Jones wrote:
> On Mon, Apr 16, 2007 at 03:16:37AM +0200, Adrian Bunk wrote:
>  > On Sun, Apr 15, 2007 at 08:54:46PM -0400, Dave Jones wrote:
>  > > On Mon, Apr 16, 2007 at 02:37:23AM +0200, Adrian Bunk wrote:
>  > > 
>  > >  > Subject    : ThinkPad X60: resume no longer works  (PCI related?)
>  > >  >              workaround: booting with "hpet=disable"
>  > >  > References : http://lkml.org/lkml/2007/3/13/3
>  > >  > Submitter  : Dave Jones <davej@...hat.com>
>  > >  >              Jeremy Fitzhardinge <jeremy@...p.org>
>  > >  > Caused-By  : PCI merge
>  > >  >              commit 78149df6d565c36675463352d0bfe0000b02b7a7
>  > >  > Handled-By : Eric W. Biederman <ebiederm@...ssion.com>
>  > >  >              Rafael J. Wysocki <rjw@...k.pl>
>  > >  > Status     : unknown
>  > > 

<snip>

> I'll try and narrow down exactly where it's failing in the
> backlight code next, but it's getting late here, so I may
> leave this until tomorrow for further investigation.
> Some other clues for anyone playing along at home:
> This X60 has Intel graphics.  ie, I'm not using any of
> the drivers that 'select FB_BACKLIGHT',

CONFIG_ACPI_VIDEO depends on BACKLIGHT_CLASS_DEVICE, which, in turn is
enabled by FB_BACKLIGHT. So we can narrow it down further, can you try?

CONFIG_FB_BACKLIGHT=y
CONFIG_ACPI_VIDEO=n

Tony


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