On Sun, 2010-01-31 at 14:11 +0000, Alan Jenkins wrote: > On 1/30/10, Rafael J. Wysocki <rjw@xxxxxxx> wrote: > > Hi, > > > > While Maxim is testing if the patch below helps with > > http://bugzilla.kernel.org/show_bug.cgi?id=14668 > > I think it's necessary anyway. > > > > The problem is that currently there's nothing to prevent us from suspending > > in > > the middle of an EC transaction in progress, at least as far as I can see. > > As a result, we can suspend with the ACPI global lock held or something like > > this, which leads to problems especially for hibernation (if the resume > > kernel > > passes control to the image kernel in the middle of an EC transaction, > > things > > aren't nice). For this reason I think we should wait until there are no EC > > transactions in progress before we suspend and we should prevent any new > > EC transactions from starting after that point. The patch below does that. Unfortunately, this patch even causes regressions on my notebook (it survive 63 hibernate cycles), but now I battery driver reports 'battery absent', backlight driver reports 0 brightness, but reload helped. I think that not only _PTS ans _WAK are problematic. What about other ACPI drivers that start accessing the EC before it is resumed? I think that these cause the problems I observe. Still, at least it does resume. Best regards, Maxim Levitsky _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
