[Gta04-owner] Replicant GTA04 : suspend bug

[Alexander Rumyantsev]

> On Sun, 27 Jan 2013 22:23:39 +0100 Paul Kocialkowski <paulk at paulk.fr> wrote:
> 
> > Le lundi 28 janvier 2013 à 07:13 +1100, NeilBrown a écrit :
> > > > Trying to investigate this problem I notice this patch
> > > > https://github.com/radekp/linux-2.6/commit/1dcf9f5f6493e5278edb5eadb453c8b9c8ee6dc2
> > > > After testing with Replicant-2.3 I found that I have not suspend/resume problem. So
> > > > 1) patch may be a temporary solution
> > > > 2) Radek or Nail - please, could you give more detail what was a reason you implement
> > > > this patch and what was next steps.
> > > 
> > > The comment at the top nearly says it all:
> > > 
> > >     Don't switch consoles or sync on suspend.
> > > 
> > >     Neither of these actions are really needed and can slow suspend
> > >     down, so disable them.
> > > 
> > > Applying the patch speed up suspend for me, and removed the switch to
> > > text-console and back which was visually disturbing.  When you use
> > > auto-suspend so that it happens quite often, this can become significant.
> > > As there were no down-sides I just left it like that.
> > > 
> > > Did you find that reverted the patch fixed a problem?  Can you provide more
> > > details of the problem.
> > > This email seems like the middle of a conversation that I haven't seen the
> > > rest of.  Did it take place on some other list that you can point me to?
> > 
> > We are still trying to find an usable Android kernel that would work
> > with DM37x, and for now, all the combinations we've tried turned out to
> > fail at some point, leaving us facing huge issues each time. We
> > definitely want to add support for the GTA04 in Replicant, but we can't
> > start any work on the userspace if we don't have a complete and usable
> > kernel first. That's why there has been no announcement regarding GTA04
> > even though we released Replicant 4.0 for other devices.
> > 
> > The context of that email was a conversation between Alexander and me
> > regarding Replicant suspend issues with GTA04.
> > 
> > We'll keep trying to end up with a stable kernel that could be used with
> > ICS, though that would be easier if there was a 3.x Android kernel for
> > OMAP DM37x devices out there. GNUtoo is working to try new combinations
> > while I gave up for now and focused on other devices.
> > 
> 
> Suppose that - hypothetically - I wanted to spend a bit of time adding
> Android bits to current mainline so that it would work on the GTA04 for
> replicant, what would I look at adding.
> 
> i.e. do you have a list of what doesn't work if you try my latest kernel?
> 
> I'm guessing that suspend-blocker is the big one.  Much of the rest is
> probably there, at least in 'staging'.
> Do you have an fs image that shows up these missing bits clear so that if I
> were - again, hypothetically - to try to enhance the kernel, I could easily
> test if it were helping at all?
> 
> Thanks,
> NeilBrown

Hello Neil

1) Thank you for quick answer and explanation a patch above. Your explanation make me sure 
in my understanding. This patch may be used as temporary solution of Replicant 2.3 suspend/resume 
problem. But real problem is some deeper, console restored incorrectly sometime if this patch 
not used.
2) My understanding a situation with Android/Replicant kernel is same as Paul has - we have not
stable kernel. It is some kernel version, which recommended to different Android version:
2.6.35 - Gingerbread, 3.0.8 - ICS . So it is not good to follow latest version kernel 
from Android point of view as you suggest. ( However Denis is going this way now ).
It is not good that in current Replicant-2.3 is used 3.2.27, it is because nothing else was found.
( I can compare situation for example with RedHat Enterprise Linux - stable kernel for version ) 
At moment I am trying to find which features from latest kernel versions is it possible to
use with current used, Paul try go get working stage for 3.0.8 version. 
My opinion that all correction concerning GTA04 should be available not only for latest kernel
version, but for some stable release. I understand that it is difficult task, but we should discuss
how to organize that.

Alexandre  

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