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

From: Antonino A. Daplas
Date: Mon Apr 16 2007 - 02:54:37 EST


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@xxxxxxxxxx>
> > > > Jeremy Fitzhardinge <jeremy@xxxxxxxx>
> > > > Caused-By : PCI merge
> > > > commit 78149df6d565c36675463352d0bfe0000b02b7a7
> > > > Handled-By : Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
> > > > Rafael J. Wysocki <rjw@xxxxxxx>
> > > > 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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