(EE) BUG: triggered 'if (priv->num_active_touches == 0)'
(EE) BUG: ../../src/synaptics.c:2966 in UpdateTouchState()
(EE) 
(EE) Backtrace:
(EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4e) [0x5645dd81e4de]
(EE) 1: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f6ff3192000+0x5b9c) [0x7f6ff3197b9c]
(EE) 2: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f6ff3192000+0x7682) [0x7f6ff3199682]
(EE) 3: /usr/lib/xorg/Xorg (0x5645dd668000+0x94188) [0x5645dd6fc188]
(EE) 4: /usr/lib/xorg/Xorg (0x5645dd668000+0xbd882) [0x5645dd725882]
(EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (0x7f6ffabc3000+0x352b0) [0x7f6ffabf82b0]
(EE) 6: /lib/x86_64-linux-gnu/libc.so.6 (ioctl+0x7) [0x7f6ffacc01c7]
(EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f6ff6d97000+0x234bc) [0x7f6ff6dba4bc]
(EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f6ff6d97000+0x2b757) [0x7f6ff6dc2757]
(EE) 9: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f6ff6d97000+0x4a756) [0x7f6ff6de1756]
(EE) 10: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f6ff6d97000+0x4ae54) [0x7f6ff6de1e54]
(EE) 11: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f6ff6d97000+0x5978f) [0x7f6ff6df078f]
(EE) 12: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f6ff6d97000+0x59aba) [0x7f6ff6df0aba]
(EE) 13: /usr/lib/xorg/Xorg (0x5645dd668000+0x141223) [0x5645dd7a9223]
(EE) 14: /usr/lib/xorg/Xorg (0x5645dd668000+0xf4148) [0x5645dd75c148]
(EE) 15: /usr/lib/xorg/Xorg (0x5645dd668000+0xf5585) [0x5645dd75d585]
(EE) 16: /usr/lib/xorg/Xorg (0x5645dd668000+0x53b7f) [0x5645dd6bbb7f]
(EE) 17: /usr/lib/xorg/Xorg (0x5645dd668000+0x57c03) [0x5645dd6bfc03]
(EE) 18: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7f6ffabe3a00]
(EE) 19: /usr/lib/xorg/Xorg (_start+0x29) [0x5645dd6a9f29]
(EE) 
(II) AIGLX: Suspending AIGLX clients for VT switch
(EE) 
Fatal server error:
(EE) EnterVT failed for gpu screen 0
(EE) 
(EE) 
Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
(EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
(EE) 
(II) AIGLX: Suspending AIGLX clients for VT switch
(EE) Server terminated with error (1). Closing log file.

X.Org X Server 1.18.1
Release Date: 2016-02-08
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.13.0-79-generic x86_64 Ubuntu
Current Operating System: Linux eris 4.4.0-12-generic #28-Ubuntu SMP Wed Mar 9 00:33:55 UTC 2016 x86_64
Kernel command line: BOOT_IMAGE=/vmlinuz-4.4.0-12-generic root=/dev/mapper/ubuntu-root ro pcie_aspm=force drm.vblankoffdelay=1 i915.semaphores=1 nmi_watchdog=0 "acpi_osi=!Windows 2012"
Build Date: 11 March 2016  07:43:21AM
xorg-server 2:1.18.1-1ubuntu4 (For technical support please see http://www.ubuntu.com/support) 
Current version of pixman: 0.33.6
	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Mon Mar 14 23:46:00 2016
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
gbm: failed to open any driver (search paths /usr/lib/x86_64-linux-gnu/dri:${ORIGIN}/dri:/usr/lib/dri)
gbm: Last dlopen error: /usr/lib/dri/evdi_dri.so: cannot open shared object file: No such file or directory
failed to load driver: evdi
EGL_MESA_drm_image required.