On Wednesday, 28 March 2007 17:52, Stefan Seyfried wrote:
> On Wed, Mar 28, 2007 at 03:22:51PM +0200, Cédric Boutillier wrote:
> > Hi !
> >
> > Here are some news. Thanks to Tim's patch, I got to the next step :
> >
> > I got a screen, saying that tasks are being stopped, and memory is
> > being written to disk. Everything seems to go fine, but then, the
> > system does not suspend ! Instead, the screen becomes white/red, and
> > gets darker and darker. The system is still responsive : if network is
> > up, I can still ssh to the system.
>
> It did not suspend/power off, but wake up immediately, but somehow
> the graphics card got fscked up in that process.
>
> looking at the kernel code in user.c:
> ------------------------------------------------------
> case SNAPSHOT_PMOPS:
> error = -EINVAL;
>
> switch (arg) {
>
> case PMOPS_PREPARE:
> if (pm_ops && pm_ops->enter) {
> data->platform_suspend = 1;
> error = 0;
> } else {
> error = -ENOSYS;
> }
> break;
>
> case PMOPS_ENTER:
> if (data->platform_suspend) {
> disable_nonboot_cpus();
> kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
> error = pm_ops->enter(PM_SUSPEND_DISK);
> enable_nonboot_cpus();
> }
> break;
>
> case PMOPS_FINISH:
> if (data->platform_suspend)
> error = 0;
>
> break;
>
> default:
> printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument
> %ld\n", arg);
>
> }
> break;
> ------------------------------------------------------
>
> I _think_ that (pm_ops && pm_ops->enter) is just not true on ppc, and
> so data->platform_suspend is also not true.
> So the PMOPS_ENTER case just returns.
I think it doesn't immediately return, but goes through the BIOS (or what it is
called on PPC) without actually suspending and _then_ returns.
It should be easy to verify by checking if the swap header is restored.
Greetings,
Rafael
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