Kernel Summit 2006: Software suspend

Posted Jul 18, 2006 10:27 UTC (Tue) by bojan (subscriber, #14302)
In reply to: Kernel Summit 2006: Software suspend by maks
Parent article: Kernel Summit 2006: Software suspend

> It's a pain that you like your out of tree playfield instead of fixing the in tree solution.

I think that's not fair. The in-tree solution doesn't offer many capabilities Suspend2 does. And every time some new feature is proposed, it's always "let's do the basics first" or "kernel is the wrong place to do it". Well, basics are mostly fine (there are bugs, sure, but which subsystem in the kernel doesn't have them?). And whether kernel is the right place to do it or not, only time will tell. How are other OSes that don't have suspend/resume problem (e.g. Windows, OSX) doing this, anyway?

What's missing from the in-tree solution is speed, versitility and user friendliness. And that's what Suspend2 is mostly about. Actually, that's what uswsusp is about too, minus the "no setup" bit.

Driver support is a problem shared between all suspend solutions. It was actually Nigel that fixed many driver issues during the course of supporting Suspend2 users.

to post comments

Kernel Summit 2006: Software suspend

Posted Jul 18, 2006 10:54 UTC (Tue) by maks (guest, #32426) [Link] (6 responses)

> I think that's not fair. The in-tree solution doesn't offer many capabilities Suspend2 does.

not unfair - mismanagment needs to be pointed out. It is the workflow of the Linux kernel. Prepare incremental patches that add/fix current implementation.

> What's missing from the in-tree solution is speed, versitility and user friendliness. And that's what Suspend2 is mostly about. Actually, that's what uswsusp is about too, minus the "no setup" bit.

latest gnome has an nice powermanagment frontend for swsusp and no the suspend2 struggles are mostly unrelated to the frontend it uses (unrevied code mass).
swsusp is fast enough for me and works on smp. afaik suspend2 routinely fails on dualcore laptops. swsusp is good, improve it.
nobody needs again 2 in kernel solutions.

Kernel Summit 2006: Software suspend

Posted Jul 18, 2006 11:40 UTC (Tue) by bojan (subscriber, #14302) [Link] (2 responses)

> <snipp unrelated talk about other os>

Always good to keep head in the sand ;-)

> afaik suspend2 routinely fails on dualcore laptops

So does swsusp - it's mostly a driver issue. As I can verify on my dual core laptop.

Kernel Summit 2006: Software suspend

Posted Jul 18, 2006 11:47 UTC (Tue) by maks (guest, #32426) [Link] (1 responses)

> So does swsusp - it's mostly a driver issue. As I can verify on my dual core laptop.

swsusp works fine here (mem, disk) on x60 once you set an bios sata option to compatible.

The driver issues are the real, good to see work on bluetooth, firewire and so on..

Kernel Summit 2006: Software suspend

Posted Jul 18, 2006 20:14 UTC (Tue) by bojan (subscriber, #14302) [Link]

> swsusp works fine here (mem, disk) on x60 once you set an bios sata option to compatible.

Apparently, this is the case with Suspend2 as well on this hardware:

http://www.gnugrass.com/personal/x60.html

On my dual core hardware, I can get both working, but only "sort of" for now. Both still have problems with (surprise) various drivers.

Sure, sometimes one solution will work on some hardware and won't on another. But generally speaking, as of recent, both have similar success rates. Which, of course, is no accident - they rely on similar stuff in the kernel to do things.

Kernel Summit 2006: Software suspend

Posted Jul 18, 2006 21:53 UTC (Tue) by NCunningham (guest, #6457) [Link]

AFAIK, Suspend2 works on any machine swsusp works on - it now uses the
same lowlevel code, and they both use cpu hotplugging, so if one is
broken, the other should be too.

Kernel Summit 2006: Software suspend

Posted Jul 19, 2006 1:12 UTC (Wed) by lamikr (guest, #2289) [Link]

How about adding suspend2 to kernel now as it is the best thing
currently available. And if there really makes sense to move some
parts of it to userspace, start the progress from there a little by little instead of waiting until swusp gets those features in some years from this day...

Kernel Summit 2006: Software suspend

Posted Jul 27, 2006 14:19 UTC (Thu) by rvfh (guest, #31018) [Link]

> nobody needs again 2 in kernel solutions.

swsusp and uswsusp? Isn't that TWO broken in-kernel solutions?

I don't care that swsusp and suspend2 SHOULD fail on the same machines: they don't. Suspend2 is successful where swsusp is NOT. Example: my wife's laptop. And that's pure FACT, no opinion.

And I also don't care that uswsusp COULD do the same as Suspend2, because for now it does not. Suspend2 is FASTER then Windows and just as good.

As a last note, I remark than Andrew Morton himself does not like the idea of user-land suspend. So what are they waiting for? A few changes to the patches? Let them come along, and let's have Suspend2 in the kernel. QUICK! We're six YEARS late!