Created attachment 140906 [details] Xorg.0.log I just upgraded to Ubuntu 18.04.1. Logging in causes a segmentation fault that eventually logs me back out. This only seems to happen when I connect to my laptop dock that has 2 monitors connected to it. This same exact hardware previously worked on Ubuntu 16.04. Relevant section from /var/log/syslog is below. I've also attached the Xorg.0.log file referenced Jul 30 09:06:49 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (II) modeset(0): EDID vendor "AUO", prod id 4589 Jul 30 09:06:49 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (II) modeset(0): Printing DDC gathered Modelines: Jul 30 09:06:49 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (II) modeset(0): Modeline "1920x1080"x0.0 141.00 1920 1936 1952 2104 1080 1083 1097 1116 +hsync -vsync (67.0 kHz eP) Jul 30 09:06:49 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (II) modeset(0): Modeline "1920x1080"x0.0 112.80 1920 1936 1952 2104 1080 1083 1097 1116 +hsync -vsync (53.6 kHz e) Jul 30 09:06:49 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (II) modeset(0): EDID vendor "AUO", prod id 4589 Jul 30 09:06:49 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (II) modeset(0): Printing DDC gathered Modelines: Jul 30 09:06:49 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (II) modeset(0): Modeline "1920x1080"x0.0 141.00 1920 1936 1952 2104 1080 1083 1097 1116 +hsync -vsync (67.0 kHz eP) Jul 30 09:06:49 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (II) modeset(0): Modeline "1920x1080"x0.0 112.80 1920 1936 1952 2104 1080 1083 1097 1116 +hsync -vsync (53.6 kHz e) Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (II) modeset(0): Allocate new frame buffer 7040x1440 stride Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: randr: falling back to unsynchronized pixmap sharing Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) Backtrace: Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4d) [0x5580649748ad] Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) 1: /usr/lib/xorg/Xorg (0x5580647bc000+0x1bc649) [0x558064978649] Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f3798b21000+0x12890) [0x7f3798b33890] Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) Segmentation fault at address 0x0 Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: Fatal server error: Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) Caught signal 11 (Segmentation fault). Server aborting Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: Please consult the The X.Org Foundation support Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: #011 at http://wiki.x.org Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: for help. Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) Please also check the log file at "/home/ach-user/.local/share/xorg/Xorg.0.log" for additional information. Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (II) AIGLX: Suspending AIGLX clients for VT switch Jul 30 09:06:50 ach-ubuntu /usr/lib/gdm3/gdm-x-session[5487]: (EE) Server terminated with error (1). Closing log file.
*** This bug has been marked as a duplicate of bug 101998 ***
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