On Mon, 2007-04-16 at 23:34 -0400, Dave Jones wrote:
> On Mon, Apr 16, 2007 at 10:26:43AM +0100, Richard Purdie wrote:
>
> > > > > > CONFIG_FB_BACKLIGHT=y
> > > > > > CONFIG_ACPI_VIDEO=n
> > > > >
> > > > > That also gets me a dead display. Backlight doesn't turn back on.
> > > >
> > > > Anything under /sys/class/backlight?
> > >
> > > Entries from ibm_acpi. I rmmod'd that, leaving the dir empty,
> > > and it still fails.
> >
> > What happens if you never load ibm-acpi?
>
> Same thing. No backlight on resume.
> I rm'd the .ko, so there's no chance it got loaded.
>
> > I'm a bit puzzled as CONFIG_FB_BACKLIGHT doesn't do anything with the
> > intelfb driver. One thing it does do is set
> > CONFIG_BACKLIGHT_CLASS_DEVICE. When you disabled FB_BACKLIGHT and got a
> > working display on resume, was that set and was (or had) ibm-acpi been
> > loaded?
> >
> > A variety of other options such as ACPI_IBM also set
> > CONFIG_BACKLIGHT_CLASS_DEVICE although without a backlight driver it
> > will do nothing hence the suspicion is on ibm-acpi, perhaps interacting
> > with the backlight class badly.
> >
> > Does echoing numbers to /sys/class/backlight/ibm_acpi/brightness change
> > the backlight brightness as expected?
>
> /sys/class/backlight/ibm/brightness takes a value from 0 to 7.
> Starts off with a default of 0. I tried all values in there, and
> it made no visible difference. But as the no-backlight thing happens
> without this even loaded, I think this is a separate problem.
>
> > If you can ssh into the machine
> > after its resumed with the display problem, it would be interesting to
> > know what the brightness was and if changing it helped too...
>
> When the backlight doesn't come on, for some reason, nothing else
> runs. Capslock works, so it's at least partially alive, but even
> doing..
>
> echo mem > /sys/power/state ; echo foo >/bar ; sync
>
> results in no /bar being created.
> Ethernet remains down when its in this state too.
Have you tried these boot options?
acpi_sleep=s3_mode; or
acpi_sleep=s3_bios,s3_mode
Tony
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