Suspend to RAM leaves backlight on

On Wed, 14 Jan 2009 15:16:12 +0100
Hans Ekbrand <hans.ekbrand.DeleteThis@sociology.gu.se> wrote:

> On Wed, Jan 14, 2009 at 01:59:27PM +0100, Vincent Lefevre wrote:
> > On 2009-01-13 20:20:05 -0800, Amit Uttamchandani wrote:
> > > I am using powerbook 3,2 with ATI Rage Mobility M3 AGP 2X. Suspend to
> > > RAM works sporadically. The disk spins down but the machine locks up
> > > and leaves the display on. This did not happen in Etch.
> >
> > Probably the same problem as me (I also have a PowerBook3,2).
> > FYI, I reported the following bug a couple of weeks ago:
> >
> > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=510108
>
> Freezing user space processes ... (elapsed 0.00 seconds) done.
> Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
> Suspending console(s)
>
> This is exacly what I see too, when suspend failed. I don't have
> access to that box right now (it belongs to a friend of mine), but
> when I get access, I can share with you the script, and perhaps we
> help each other to narrow down the problem.

I tried with kernel 2.6.25 as mentioned in the other post and I'm not
having any problems. Could be a kernel issue I guess.


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On Wed, 14 Jan 2009 13:59:27 +0100
Vincent Lefevre <vincent.RemoveThis@vinc17.org> wrote:

> On 2009-01-13 20:20:05 -0800, Amit Uttamchandani wrote:
> > I am using powerbook 3,2 with ATI Rage Mobility M3 AGP 2X. Suspend to
> > RAM works sporadically. The disk spins down but the machine locks up
> > and leaves the display on. This did not happen in Etch.
>
> Probably the same problem as me (I also have a PowerBook3,2).
> FYI, I reported the following bug a couple of weeks ago:
>
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=510108
>

Thanks for the link.

I never had a problem with this is Etch. In fact, I just tried this, it
works fine with kernel 2.6.25 in lenny as well. If you can try using
kernel 2.6.25 and confirm that it works for you then we can isolate the
issue to kernel 2.6.26 in lenny.

Amit


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On Thu, 15 Jan 2009 00:14:28 +0100
Hans Ekbrand <hans.TakeThisOut@sociologi.cjb.net> wrote:

> On Wed, Jan 14, 2009 at 08:30:41AM -0800, Amit Uttamchandani wrote:
> > On Wed, 14 Jan 2009 15:16:12 +0100
> > Hans Ekbrand <hans.ekbrand.TakeThisOut@sociology.gu.se> wrote:
> >
> > > On Wed, Jan 14, 2009 at 01:59:27PM +0100, Vincent Lefevre wrote:
> > > > On 2009-01-13 20:20:05 -0800, Amit Uttamchandani wrote:
> > > > > I am using powerbook 3,2 with ATI Rage Mobility M3 AGP 2X. Suspend to
> > > > > RAM works sporadically. The disk spins down but the machine locks up
> > > > > and leaves the display on. This did not happen in Etch.
> > > >
> > > > Probably the same problem as me (I also have a PowerBook3,2).
> > > > FYI, I reported the following bug a couple of weeks ago:
> > > >
> > > > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=510108
> > >
> > > Freezing user space processes ... (elapsed 0.00 seconds) done.
> > > Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
> > > Suspending console(s)
> > >
> > > This is exacly what I see too, when suspend failed. I don't have
> > > access to that box right now (it belongs to a friend of mine), but
> > > when I get access, I can share with you the script, and perhaps we
> > > help each other to narrow down the problem.
> >
> > I tried with kernel 2.6.25 as mentioned in the other post and I'm not
> > having any problems. Could be a kernel issue I guess.
>
> I am almost certain that it is a kernel issue, since the first part of
> suspending process is successful.
>
> Trying with 2.6.25 might be a workaround, but 2.6.25 is not available
> in lenny so from where should I install it?
>

I guess it has been removed. But 2.6.25 was in lenny for sometime. I am
not sure if there is some other way to get the package..


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On 2009-01-14 08:29:03 -0800, Amit Uttamchandani wrote:
> I never had a problem with this is Etch. In fact, I just tried this, it
> works fine with kernel 2.6.25 in lenny as well. If you can try using
> kernel 2.6.25 and confirm that it works for you then we can isolate the
> issue to kernel 2.6.26 in lenny.

I didn't have any problem with 2.6.25-2-powerpc in July (when I also
used suspend).

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On Thu, 15 Jan 2009 04:15:55 +0100
Vincent Lefevre <vincent.DeleteThis@vinc17.org> wrote:

> On 2009-01-14 08:29:03 -0800, Amit Uttamchandani wrote:
> > I never had a problem with this is Etch. In fact, I just tried this, it
> > works fine with kernel 2.6.25 in lenny as well. If you can try using
> > kernel 2.6.25 and confirm that it works for you then we can isolate the
> > issue to kernel 2.6.26 in lenny.
>
> I didn't have any problem with 2.6.25-2-powerpc in July (when I also
> used suspend).
>

Ok so it's definitely a kernel issue. The way I see it is I don't think
we will see a new kernel in lenny. Now, we can probably further isolate
the issue by doing the following:

1. Get the debian source package and build it ourselves. See if that
prevents the issue.

2. Try out latest kernels 2.6.27 and 2.6.28 (by building from source)
and see if that prevents the issue.

What do you think?

Amit


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On 2009-01-14 21:56:24 -0800, Amit Uttamchandani wrote:
> 1. Get the debian source package and build it ourselves. See if that
> prevents the issue.
>
> 2. Try out latest kernels 2.6.27 and 2.6.28 (by building from source)
> and see if that prevents the issue.
>
> What do you think?

I'm not sure I have enough free disk space to build a kernel from
source. I can cross-compile from another Debian machine, but I don't
know how to do that.

BTW, I have performance problems with 2.6.28 (from upstream) on an
x86_64 machine: shell scripts are much slower (e.g. 3.6 times as
slow for lesspipe, compared to a 2.6.26.5 kernel under the same
conditions). So, perhaps I'll wait before trying.

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Vincent Lefèvre <vincent.RemoveThis@vinc17.org> - Web: <http://www.vinc17.org/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.org/blog/>
Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)


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