X crashes and suspend fails upon suspend-by-closing-the-lid after 20+ hours of X uptime

[Athlion]

Hello all!

After using my laptop reaches more than about 20 hours of uptime (and I have a
couple of suspend/resume cycles in between by closing the lid) the next suspend
fails like this:

The system never sleeps, instead the kernel dmesg stops at:
> PM: Syncing filesystems ... done.
> PM: Preparing system for mem sleep

and never makes it to
> Freezing user space processes ... (elapsed 0.01 seconds) done.
> Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
> PM: Entering mem sleep
> ...

Furthermore, if I open the lid I find that X has crashed, my whole session is
lost and I am back at the display manager to login.

The only fix I have found to this problem is either
-> Never suspend by closing the lid, or
-> Always kill the X server every about 10-12 hours

I am using a Lenovo T420 with HD3000 onboard and no nvidia present. There is an
active thread here https://bbs.archlinux.org/viewtopic.php?id=144381, ignore
the title saying about linux 3.4, it happens with kernels back to 3.0
(and probably older)

It happens with
-> xorg-server-1.12.3
-> xorg-server-1.12.3.901
-> xorg-server-1.12.4

after the failed suspend, the end of /var/log/Xorg.0.log is this
[  7078.130] (II) AIGLX: Suspending AIGLX clients for VT switch
[  7081.997] (II) AIGLX: Resuming AIGLX clients after VT switch
[  7082.050] (II) intel(0): EDID vendor "LGD", prod id 738
[  7082.050] (II) intel(0): Printing DDC gathered Modelines:
[  7082.050] (II) intel(0): Modeline "1600x900"x0.0   96.00  1600 1648 1680
1728  900 903 908 926 -hsync -vsync (55.6 kHz eP)
[  7085.063] (--) synaptics: SynPS/2 Synaptics TouchPad: touchpad found
[  8611.400]
[  8611.400] Backtrace:
[  8611.404] 0: /usr/bin/X (xorg_backtrace+0x36) [0x560306]
[  8611.404] 1: /usr/bin/X (0x400000+0x164039) [0x564039]
[  8611.404] 2: /usr/lib/libpthread.so.0 (0x7fe2ecf1c000+0xf170)
[0x7fe2ecf2b170]
[  8611.404] 3: /usr/bin/X (XIChangeDeviceProperty+0x1b8) [0x502d58]
[  8611.404] 4: /usr/bin/X (DisableDevice+0x20f) [0x42d8ff]
[  8611.404] 5: /usr/bin/X (xf86Wakeup+0x494) [0x46fa44]
[  8611.404] 6: /usr/bin/X (WakeupHandler+0x6b) [0x43848b]
[  8611.404] 7: /usr/bin/X (WaitForSomething+0x1a4) [0x55d744]
[  8611.404] 8: /usr/bin/X (0x400000+0x34281) [0x434281]
[  8611.404] 9: /usr/bin/X (0x400000+0x23615) [0x423615]
[  8611.404] 10: /usr/lib/libc.so.6 (__libc_start_main+0xf5) [0x7fe2ebdcb725]
[  8611.404] 11: /usr/bin/X (0x400000+0x238ed) [0x4238ed]
[  8611.404]
[  8611.405] Segmentation fault at address 0x11
[  8611.405]
Fatal server error:
[  8611.405] Caught signal 11 (Segmentation fault). Server aborting
[  8611.405]
[  8611.405]
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[  8611.405] Please also check the log file at "/var/log/Xorg.0.log" for
additional information.
[  8611.405]
[  8611.720] (II) evdev: ThinkPad Extra Buttons: Close
[  8611.720] (II) UnloadModule: "evdev"
[  8612.040] (II) evdev: TPPS/2 IBM TrackPoint: Close
[  8612.040] (II) UnloadModule: "evdev"

Kernel-side (I don't know if this is relevant, but anyway), execution stops at:

> drivers/tty/vt/vt_ioctl.c:133: wait_event_interruptible
> drivers/tty/vt/vt_ioctl.c:1426: vt_waitactive
> kernel/power/console.c:19: vt_move_to_console
> kernel/power/suspend.c:98: pm_prepare_console
> suspend_prepare() called

To make things a bit more weird, if I choose to shutdown or reboot
after a failed suspend, sometime before the end the kernel 'wakes up'
and actually suspends my laptop. On resume, the reboot/shutdown
continues.

If you need more info, please request it, I will make it available.

Thanks and sorry for the long post.