Sudden logout

[Dzmitry Lazerka]

Ubuntu 12.10, default Unity, default Ambiance. Lenovo w530, external monitor Dell 2713HM (laptop is closed).
Once or twice a day Ubuntu suddenly logs out, killing all applications and loosing my data. Here's in Xorg.log:
[ 113.479] (EE) Backtrace:
[ 113.479] (EE) 0: /usr/bin/X (xorg_backtrace+0x34) [0x7f7a1890b644]
[ 113.479] (EE) 1: /usr/bin/X (0x7f7a18756000+0x7f38f) [0x7f7a187d538f]
[ 113.479] (EE) 2: /usr/bin/X (0x7f7a18756000+0x140f1b) [0x7f7a18896f1b]
[ 113.479] (EE) 3: /usr/bin/X (0x7f7a18756000+0x140875) [0x7f7a18896875]
[ 113.479] (EE) 4: /usr/bin/X (0x7f7a18756000+0x1434f3) [0x7f7a188994f3]
[ 113.479] (EE) 5: /usr/bin/X (0x7f7a18756000+0x166a7a) [0x7f7a188bca7a]
[ 113.479] (EE) 6: /usr/bin/X (mieqProcessDeviceEvent+0x204) [0x7f7a188ec224]
[ 113.479] (EE) 7: /usr/bin/X (mieqProcessInputEvents+0x84) [0x7f7a188ec2b4]
[ 113.479] (EE) 8: /usr/bin/X (ProcessInputEvents+0x9) [0x7f7a187eb159]
[ 113.479] (EE) 9: /usr/bin/X (0x7f7a18756000+0x554e3) [0x7f7a187ab4e3]
[ 113.480] (EE) 10: /usr/bin/X (0x7f7a18756000+0x4415a) [0x7f7a1879a15a]
[ 113.480] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xed) [0x7f7a1670176d]
[ 113.480] (EE) 12: /usr/bin/X (0x7f7a18756000+0x444b1) [0x7f7a1879a4b1]
[ 113.480] (EE)
[ 113.491] (EE) BUG: triggered 'if (!(event->device_event.flags & (1 << 5)))'
[ 113.491] (EE) BUG: ../../dix/touch.c:628 in TouchConvertToPointerEvent()
[ 113.491] (EE) Non-emulating touch event

and a lots of it.

Also, maybe related, after logout mouse can be moved behind the left edge of the screen, and login form disappears, exactly like if it went to other monitor, although my laptop is closed. After logging in mouse is drawn several hundred pixels to the left of where mouseclick happens. Moving mouse to the left redraws mouse in correct place. There's also in Xorg.log:
[ 1120.818] (II) NVIDIA(GPU-0): Display (Lenovo Group Limited (DFP-0)) does not support NVIDIA
[ 1120.818] (II) NVIDIA(GPU-0): 3D Vision stereo.
[ 1120.818] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
[ 1120.818] (**) NVIDIA(0): device Lenovo Group Limited (DFP-0) (Using EDID
[ 1120.818] (**) NVIDIA(0): frequencies has been enabled on all display devices.)
[ 1120.819] (II) NVIDIA(GPU-0): Display (DELL U2713H (DFP-5)) does not support NVIDIA 3D
[ 1120.819] (II) NVIDIA(GPU-0): Vision stereo.
[ 1120.819] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display
[ 1120.819] (**) NVIDIA(0): device DELL U2713H (DFP-5) (Using EDID frequencies has
[ 1120.819] (**) NVIDIA(0): been enabled on all display devices.)
[ 1120.820] (WW) NVIDIA(GPU-0): The EDID for DELL U2713H (DFP-5) contradicts itself: mode
[ 1120.820] (WW) NVIDIA(GPU-0): "720x480" is specified in the EDID; however, the EDID's
[ 1120.820] (WW) NVIDIA(GPU-0): valid HorizSync range (29.000-113.000 kHz) would exclude
[ 1120.820] (WW) NVIDIA(GPU-0): this mode's HorizSync (15.7 kHz); ignoring HorizSync check
[ 1120.820] (WW) NVIDIA(GPU-0): for mode "720x480".
[ 1120.820] (WW) NVIDIA(GPU-0): The EDID for DELL U2713H (DFP-5) contradicts itself: mode
[ 1120.820] (WW) NVIDIA(GPU-0): "720x576" is specified in the EDID; however, the EDID's
[ 1120.820] (WW) NVIDIA(GPU-0): valid HorizSync range (29.000-113.000 kHz) would exclude
[ 1120.820] (WW) NVIDIA(GPU-0): this mode's HorizSync (15.6 kHz); ignoring HorizSync check
[ 1120.820] (WW) NVIDIA(GPU-0): for mode "720x576".
[ 1120.821] (WW) NVIDIA(GPU-0): The EDID for DELL U2713H (DFP-5) contradicts itself: mode
[ 1120.821] (WW) NVIDIA(GPU-0): "720x480" is specified in the EDID; however, the EDID's
[ 1120.821] (WW) NVIDIA(GPU-0): valid HorizSync range (29.000-113.000 kHz) would exclude
[ 1120.821] (WW) NVIDIA(GPU-0): this mode's HorizSync (15.7 kHz); ignoring HorizSync check
[ 1120.821] (WW) NVIDIA(GPU-0): for mode "720x480".
[ 1120.821] (WW) NVIDIA(GPU-0): The EDID for DELL U2713H (DFP-5) contradicts itself: mode
[ 1120.821] (WW) NVIDIA(GPU-0): "720x576" is specified in the EDID; however, the EDID's
[ 1120.821] (WW) NVIDIA(GPU-0): valid HorizSync range (29.000-113.000 kHz) would exclude
[ 1120.821] (WW) NVIDIA(GPU-0): this mode's HorizSync (15.6 kHz); ignoring HorizSync check
[ 1120.821] (WW) NVIDIA(GPU-0): for mode "720x576".
[ 1120.821] (WW) NVIDIA(GPU-0): The EDID for DELL U2713H (DFP-5) contradicts itself: mode
[ 1120.821] (WW) NVIDIA(GPU-0): "1920x1080" is specified in the EDID; however, the EDID's
[ 1120.821] (WW) NVIDIA(GPU-0): valid HorizSync range (29.000-113.000 kHz) would exclude
[ 1120.821] (WW) NVIDIA(GPU-0): this mode's HorizSync (28.1 kHz); ignoring HorizSync check
[ 1120.821] (WW) NVIDIA(GPU-0): for mode "1920x1080".
[ 1120.822] (WW) NVIDIA(GPU-0): The EDID for DELL U2713H (DFP-5) contradicts itself: mode
[ 1120.822] (WW) NVIDIA(GPU-0): "1920x1080" is specified in the EDID; however, the EDID's
[ 1120.822] (WW) NVIDIA(GPU-0): valid HorizSync range (29.000-113.000 kHz) would exclude
[ 1120.822] (WW) NVIDIA(GPU-0): this mode's HorizSync (27.0 kHz); ignoring HorizSync check
[ 1120.822] (WW) NVIDIA(GPU-0): for mode "1920x1080".
[ 1120.822] (WW) NVIDIA(GPU-0): The EDID for DELL U2713H (DFP-5) contradicts itself: mode
[ 1120.822] (WW) NVIDIA(GPU-0): "1920x1080" is specified in the EDID; however, the EDID's
[ 1120.822] (WW) NVIDIA(GPU-0): valid VertRefresh range (49.000-86.000 Hz) would exclude
[ 1120.822] (WW) NVIDIA(GPU-0): this mode's VertRefresh (24.0 Hz); ignoring VertRefresh
[ 1120.822] (WW) NVIDIA(GPU-0): check for mode "1920x1080".