Re: 2.6.25-rc2 regression - hang on suspend

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On Fri, 2008-02-22 at 00:06 +0100, Rafael J. Wysocki wrote: 
> On Thursday, 21 of February 2008, Soeren Sonnenburg wrote:
> > On Thu, 2008-02-21 at 01:31 +0100, Rafael J. Wysocki wrote:
> > > On Wednesday, 20 of February 2008, Soeren Sonnenburg wrote:
> > > > On Wed, 2008-02-20 at 00:50 +0100, Rafael J. Wysocki wrote:
[...] 
> > Using echo none >/sys/power/pm_test and then
> > echo mem >/sys/power/state I see it hang on ata1 errors again. Waiting
> > about 10-30 seconds it progresses further and finally arrives at 
> > 
> > CPU0 attaching NULL sched-domain
> > CPU1 attaching NULL sched-domain
> > 
> > then hangs.
> 
> Please see if compiling the kernel with CONFIG_SMP unset makes suspend
> work.

*Argh*, this bug is not behaving nicely :( Whatever happened,
git-current now suspends correctly with and without CONFIG_SMP  and all
may CONFIG_PREEMPT_RCU=y and CONFIG_CLASSIC_RCU=y attempts. Also no sata
errors anymore.

However it is not reliably waking up (at least when all of the above
except CLASSIC_RCU is on). Sometimes the display remains black on the
console, but X still works and sometimes it hangs completely on resume.

Also when compiling these many kernels via make -j4 I noted that I could
hardly move the mouse / use the keyboard, but saw random jumps and
key-repetitions...

Soeren
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