logout at resume and swap usage (suspend to ram)

On Monday 11,January,2010 10:19 PM, bruno wrote:
> Public bug reported:
>
> Binary package hint: pm-utils
>
> I use Ubuntu 9.10 64 bits with pm-utils 1.2.5-2ubuntu7. I don't talk about hibernation here.
> I can suspend to ram and resume, but sometimes, I have to do a new login (my session is not always saved). I didn't have this problem in Hardy 64 bits.
>
> I'm not sure, but It seems to be related to swap partition. I have 2 Gb
> RAM. Initially, I had 1 Gb swap. The problem was reproducible when more
> RAM was used (say VBox+other things for about 1.5 Gb usage) but happened
> more randomly even with low ram usage. Then I had the idea to increase
> the swap to 2 Gb. Magic: the problem disappeared... until I started to
> use "fast user switch". With 2 or 3 sessions opened (even with few
> applications) I often loose one of them (mine...) after a resume. I
> tried to add another 1 Gb swap partition (3 Gb total). The problem is
> still present and I'm not sure if it's better with 3 Gb than with 2 Gb.
>
> Conclusion:
> 1) swap seems to be used with suspend to ram, which seems abnormal
Swap is never used for suspend to ram. You must have been accidentally
hibernating. Try turning all your swaps off and then suspending to ram. If you
really are, then it will still work.
> 2) logout happen sometimes at resume, at least for the admin user, even with a decent swap partition.
You're probably noticing a crash in X (the display server) upon resume, or
perhaps even X getting OOM-killed, the common factor being X dying after a
suspend/resume cycle. Please post your /var/log/Xorg.*.log.old after this
happens, and also your /var/log/kern.log

  status incomplete

--
Kind regards,
Chow Loong Jin (GPG: 0x8F02A411)
Ubuntu Contributing Developer

It happened agin this noon, so I post my Xorg.1.log.old and /var/log/kern.log as asked. Also, I must reject the "accidental hibernation" theory because I never see the BIOS and GRUB steps after a resume; I drop directly to the lock screen (if it's work as supposed) or to the login screen with my session not open (if not, but other sessions can be still opened). Thank you for your time.

Xorg.1.log.old shows a X server crash. I'm reassigning this to X.

I think I have found something.

First, I use nvidia-173 (not 180) since I have an old FX5200. Second, the problem happened frequently with a dual screen xorg.conf (separate X screen). With a standard (single screen) configuration, the problem seems to disappear (10 resumes in a row...).

I will investigate soon with twinview to see if I can have a correct dual screen setup without the logout on resume bug. I don't understand why it was related to memory and swap usage, from my observations.

This bug report was filed against an old version of Ubuntu.
Can you confirm whether this is still an issue in natty?

If you don't mind, it would be very helpful if you could update the bug
report in launchpad to 'Fix Released' if it is no longer an issue for
you, or if it is still occurring under natty, please tag the bug 'natty'
so it's easier for us to track.

I have upgraded my system, so I don't know if it's still an issue. As I said in post #6 a possible workaround at that time was to disable the dual-screen (separate X at least). So I will change the status to "fix released" as you suggest.