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SubjectRe: [3/3] 2.6.21-rc7: known regressions (v2)
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On Wed, 2007-04-25 at 09:01 -0400, Dave Jones wrote:
> On Wed, Apr 25, 2007 at 01:31:02PM +0200, Adrian Bunk wrote:
> > On Wed, Apr 25, 2007 at 04:06:05AM -0700, Andrew Morton wrote:
> > > On Mon, 23 Apr 2007 23:49:09 +0200 Adrian Bunk <bunk@stusta.de> wrote:
> > >...
> > > > Subject : ThinkPad X60: resume no longer works (PCI related?)
> > > > workaround: CONFIG_FB_BACKLIGHT=n
> > > > References : http://lkml.org/lkml/2007/3/13/3
> > > > Submitter : Dave Jones <davej@redhat.com>
> > > > Caused-By : PCI merge
> > > > commit 78149df6d565c36675463352d0bfe0000b02b7a7
> > > > Handled-By : Eric W. Biederman <ebiederm@xmission.com>
> > > > Rafael J. Wysocki <rjw@sisk.pl>
> > > > Antonino A. Daplas <adaplas@gmail.com>
> > > > Status : unknown
> > >
> > > Is this related to the problems Jeremy has been looking at?
> > >...
> >
> > Dave and Jeremy hran into similar looking but most likely different
> > problems.
> >
> > For Jeremy -rc7 is working fine, but for Dave it doesn't.
>
> I think this was due to Jeremy not having CONFIG_FB_BACKLIGHT=y in his config.

This is really weird, as CONFIG_FB_BACKLIGHT just selects
BACKLIGHT_CLASS and LCD_CLASS, and adds an entry (bl_curve)
under /sys/class/backlight/*/. ACPI_IBM which is set (presumably) in
Dave's kconfig, also selects the BACKLIGHT_CLASS. And the only possible
framebuffer drivers in the thinkpad are vesafb and intelfb, none of
which has a backlight driver.

I'm still at a loss how this happens. Dave, can you post your config?
And have you tried the following settings:

FB_BACKLIGHT=y
ACPI_IBM=n
ACPI_VIDEO=n

I'm also adding Richard Purdie to the CC list.

Tony

PS: I also get a blank display on resume with a Toshiba laptop. But
cycling through the Fn keys brings it back. I don't know if this is a
regression, I will have to try older kernels.


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