On Thu, 27 Oct 2016, Ville Syrjälä wrote: > On Tue, Aug 09, 2016 at 08:20:57PM +0300, Ville Syrjälä wrote: > > On Thu, Jul 14, 2016 at 04:29:42PM +0800, Feng Tang wrote: > > > if you only want it to work, you can try an old patch > > > https://bugzilla.kernel.org/attachment.cgi?id=76071 from a similar bug > > > https://bugzilla.kernel.org/show_bug.cgi?id=41932 > > > > > > Alistair Buxton confirmed it work for 3.18 at least > > > https://bugzilla.kernel.org/show_bug.cgi?id=107151#c16 > > > > That patch is a bit too ripe by now. Would need a fresh squeezed one. > > Since no one else bothered to refresh the patch I did it myself: > > diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c > index f6aae7977824..d73d094a8972 100644 > --- a/kernel/time/tick-broadcast.c > +++ b/kernel/time/tick-broadcast.c > @@ -657,8 +657,16 @@ static void tick_handle_oneshot_broadcast(struct clock_event_device *dev) > * - There are pending events on sleeping CPUs which were not > * in the event mask > */ > - if (next_event.tv64 != KTIME_MAX) > + if (next_event.tv64 != KTIME_MAX) { > + s64 delta = next_event.tv64 - now.tv64; > + > + if (delta >= 10000000000) { > + printk(KERN_CRIT "%s(): The delta is big: %lld\n", __func__, delta); > + next_event.tv64 = now.tv64 + 3000000000; > + } > + > tick_broadcast_set_event(dev, next_cpu, next_event); > + } > > raw_spin_unlock(&tick_broadcast_lock); > > Unfortunately it doesn't do anything for me. And I'm not surprised, because the original patch forced a 5 seconds event in the broadcast device on resume, aside of limiting the reprogramming. What that old patch did, was: 1) Make sure that the broadcast device is actually armed at resume. That might cause the HPET to resume proper. 2) Force a max. 3 seconds rearm when the targeted expiry time is > than 10 seconds That might make sure that lower C-States are never entered. > The fortunate thing is that acpi-idle has magically been fixed in the > meantime, so I can at least go back to using that one and have working > S3. What's the lowest C-State with acpi-idle and what's the lowest one with intel_idle? Thanks, tglx
