On Wed, 2007-12-12 at 13:45 +1100, Benjamin Herrenschmidt wrote: > I only just noticed a huge regression that was introduced when we moved > PowerPC to the generic APM emulation code instead of our own. I'm in > large part to blame since I acked the patch... > > Basically, what we lost is the mechanism for notifying user applications > and waiting for their ACK before proceeding to system suspend. The new > generic code will still do that ... only when the actual suspend request > initiates from an APM suspend ioctl.
Indeed. > For any other suspend (via our private PMU ioctl or via the sysfs > interface), userspace will -not- be notified. Right. > That basically means X will break. That's why X broke on the latest > ubuntu until I whacked some new scripts in them to force console > switching, among other things. Possibly other apps that relied > on /dev/apm_bios to be notified of system suspend/resume broke as well. Ah. I guess I never noticed because I had the scripts to do console switching all along. > Now the question is that is it still work trying to fix it ? That would > probably require APM emulation hooking at a fairly high level into the > generic PM code to trigger the signaling & waiting of processes before > freeze & device suspend among others... Yeah, bit icky... but doable. Rafael, any ideas? johannes
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