Comment 9 for bug 1691991

The below is testing after remove of "xserver-xorg-video-fbdev package"

ubuntu@ubuntu:/usr/lib/xorg/modules/drivers$ sudo /usr/lib/xorg/Xorg

X.Org X Server 1.18.4
Release Date: 2016-07-19
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.4.0-45-generic aarch64 Ubuntu
Current Operating System: Linux ubuntu 4.10.0-20.22-generic #22+pearl.2-Ubuntu SMP Thu Apr 27 20:23:08 UTC 2017 aarch64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.10.0-20.22-generic root=UUID=eee681c5-04ce-4cd0-a004-cae6717961ce ro debug earlycon=pl011,mmio,0x602B0000 console=tty0
Build Date: 02 November 2016 10:05:28PM
xorg-server 2:1.18.4-0ubuntu0.2 (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: Tue May 30 17:45:40 2017
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(EE)
Fatal server error:
(EE) no screens found(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)
(EE) Server terminated with error (1). Closing log file.
ubuntu@ubuntu:/usr/lib/xorg/modules/drivers$

ubuntu@ubuntu:/usr/lib/xorg/modules/drivers$ less /var/log/Xorg.0.log
[1029553.709]
X.Org X Server 1.18.4
Release Date: 2016-07-19
[1029553.709] X Protocol Version 11, Revision 0
[1029553.709] Build Operating System: Linux 4.4.0-45-generic aarch64 Ubuntu
[1029553.709] Current Operating System: Linux ubuntu 4.10.0-20.22-generic #22+pearl.2-Ubuntu SMP Thu Apr 27 20:23:08 UTC 2017 aarch64
[1029553.709] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.10.0-20.22-generic root=UUID=eee681c5-04ce-4cd0-a004-cae6717961ce ro debug earlycon=pl011,mmio,0x602B0000 console=tty0
[1029553.709] Build Date: 02 November 2016 10:05:28PM
[1029553.709] xorg-server 2:1.18.4-0ubuntu0.2 (For technical support please see http://www.ubuntu.com/support)
[1029553.709] Current version of pixman: 0.33.6
[1029553.709] Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[1029553.709] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[1029553.709] (==) Log file: "/var/log/Xorg.0.log", Time: Tue May 30 17:45:40 2017
[1029553.709] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[1029553.710] (==) No Layout section. Using the first Screen section.
[1029553.710] (==) No screen section available. Using defaults.
[1029553.710] (**) |-->Screen "Default Screen Section" (0)
[1029553.710] (**) | |-->Monitor "<default monitor>"
[1029553.710] (==) No monitor specified for screen "Default Screen Section".
        Using a default monitor configuration.
[1029553.710] (==) Automatically adding devices
[1029553.710] (==) Automatically enabling devices
[1029553.710] (==) Automatically adding GPU devices
[1029553.710] (==) Max clients allowed: 256, resource mask: 0x1fffff
[1029553.710] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[1029553.710] Entry deleted from font path.
[1029553.710] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[1029553.710] Entry deleted from font path.
[1029553.710] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[1029553.710] Entry deleted from font path.
[1029553.710] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[1029553.710] Entry deleted from font path.
[1029553.710] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[1029553.710] Entry deleted from font path.
[1029553.710] (==) FontPath set to:
        /usr/share/fonts/X11/misc,
        /usr/share/fonts/X11/Type1,
        built-ins
les,/usr/lib/xorg/extra-modules,/usr/lib/xorg/modules"
s.
es.
[1029553.710] (II) Loader magic: 0xaaaab1d99d80
[1029553.710] (II) Module ABI versions:
[1029553.710] X.Org ANSI C Emulation: 0.4
[1029553.710] X.Org Video Driver: 20.0
[1029553.710] X.Org XInput driver : 22.1
[1029553.710] X.Org Server Extension : 9.0
[1029553.711] (--) using VT number 3

ptty was not provided, disabling logind integration
[1029553.712] (II) xfree86: Adding drm device (/dev/dri/card0)
/33554432, 0x8ab000000/2097152
[1029553.713] (II) LoadModule: "glx"
[1029553.713] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[1029553.714] (II) Module glx: vendor="X.Org Foundation"
[1029553.714] compiled for 1.18.4, module version = 1.0.0
[1029553.714] ABI class: X.Org Server Extension, version 9.0
[1029553.714] (==) AIGLX enabled
[1029553.714] (==) Matched modesetting as autoconfigured driver 0
[1029553.714] (==) Matched fbdev as autoconfigured driver 1
[1029553.714] (==) Assigned the driver to the xf86ConfigLayout
[1029553.714] (II) LoadModule: "modesetting"
[1029553.715] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[1029553.715] (II) Module modesetting: vendor="X.Org Foundation"
[1029553.715] compiled for 1.18.4, module version = 1.18.4
[1029553.715] Module class: X.Org Video Driver
[1029553.715] ABI class: X.Org Video Driver, version 20.0
[1029553.715] (II) LoadModule: "fbdev"
[1029553.715] (WW) Warning, couldn't open module fbdev
[1029553.715] (II) UnloadModule: "fbdev"
[1029553.715] (II) Unloading fbdev
[1029553.715] (EE) Failed to load module "fbdev" (module does not exist, 0)
[1029553.715] (==) Matched modesetting as autoconfigured driver 0
[1029553.715] (==) Matched fbdev as autoconfigured driver 1
[1029553.715] (==) Assigned the driver to the xf86ConfigLayout
[1029553.715] (II) LoadModule: "modesetting"
[1029553.715] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[1029553.715] (II) Module modesetting: vendor="X.Org Foundation"
[1029553.715] compiled for 1.18.4, module version = 1.18.4
[1029553.715] Module class: X.Org Video Driver
[1029553.715] ABI class: X.Org Video Driver, version 20.0
[1029553.715] (II) UnloadModule: "modesetting"
[1029553.715] (II) Unloading modesetting
[1029553.715] (II) Failed to load module "modesetting" (already loaded, 0)
[1029553.715] (II) LoadModule: "fbdev"
[1029553.716] (WW) Warning, couldn't open module fbdev
[1029553.716] (II) UnloadModule: "fbdev"
[1029553.716] (II) Unloading fbdev
[1029553.716] (EE) Failed to load module "fbdev" (module does not exist, 0)
[1029553.716] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[1029553.716] (II) modeset(G0): using drv /dev/dri/card0
[1029553.716] (EE) No devices detected.
[1029553.716] (EE)
Fatal server error:
[1029553.716] (EE) no screens found(EE)
[1029553.716] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[1029553.716] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[1029553.716] (EE)
ubuntu@ubuntu:/usr/lib/xorg/modules/drivers$