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Subject: Re: [2/2] 2.6.21-rc7: known regressions
From: "Antonino A. Daplas" <adaplas@gmail.com>
To: Dave Jones <davej@redhat.com>
Cc: Adrian Bunk <bunk@stusta.de>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Jeremy Fitzhardinge <jeremy@goop.org>,
       Richard Purdie <rpurdie@rpsys.net>
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Date: Mon, 16 Apr 2007 14:54:07 +0800
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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@redhat.com>
>  > >  >              Jeremy Fitzhardinge <jeremy@goop.org>
>  > >  > Caused-By  : PCI merge
>  > >  >              commit 78149df6d565c36675463352d0bfe0000b02b7a7
>  > >  > Handled-By : Eric W. Biederman <ebiederm@xmission.com>
>  > >  >              Rafael J. Wysocki <rjw@sisk.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