x11-fonts may not be on your system yet. adding that package may make X11 happier. At a guess I think what happened here is because X11 is missing its fonts first it generates many warnings and eventually generates a fatal error. If you use grep to search log files for fatal and error and warning you can learn lots and fix many things. dmesg|grep -i warning and dmesg|grep -i error when run through less can be informative.

On Sun, 23 Jul 2017, Long Wind wrote:

Date: Sun, 23 Jul 2017 06:17:41
From: Long Wind <longwind2...@gmail.com>
To: debian-user <debian-user@lists.debian.org>
Subject: how to let a user use X window
Resent-Date: Sun, 23 Jul 2017 10:26:35 +0000 (UTC)
Resent-From: debian-user@lists.debian.org

only root can use X window in stretch??

how to let user use it?

below is X log:

[  1548.947]
X.Org X Server 1.19.2
Release Date: 2017-03-02
[  1548.947] X Protocol Version 11, Revision 0
[  1548.947] Build Operating System: Linux 4.9.0-3-amd64 i686 Debian
[  1548.948] Current Operating System: Linux debian 4.9.0-3-686-pae #1
SMP Debian 4.9.30-2 (2017-06-12) i686
[  1548.948] Kernel command line:
BOOT_IMAGE=/boot/vmlinuz-4.9.0-3-686-pae root=/dev/sda2 ro quiet
net.ifnames=0
[  1548.948] Build Date: 07 July 2017  06:13:53AM
[  1548.948] xorg-server 2:1.19.2-1+deb9u1 (https://www.debian.org/support)
[  1548.948] Current version of pixman: 0.34.0
[  1548.948]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[  1548.948] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[  1548.949] (==) Log file: "/home/zhou/.local/share/xorg/Xorg.0.log",
Time: Sun Jul 23 06:05:18 2017
[  1548.950] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[  1548.950] (==) No Layout section.  Using the first Screen section.
[  1548.950] (==) No screen section available. Using defaults.
[  1548.950] (**) |-->Screen "Default Screen Section" (0)
[  1548.950] (**) |   |-->Monitor "<default monitor>"
[  1548.950] (==) No monitor specified for screen "Default Screen Section".
        Using a default monitor configuration.
[  1548.950] (==) Automatically adding devices
[  1548.950] (==) Automatically enabling devices
[  1548.950] (==) Automatically adding GPU devices
[  1548.950] (==) Max clients allowed: 256, resource mask: 0x1fffff
[  1548.950] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[  1548.950]    Entry deleted from font path.
[  1548.950] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[  1548.950]    Entry deleted from font path.
[  1548.950] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[  1548.950]    Entry deleted from font path.
[  1548.950] (WW) The directory "/usr/share/fonts/X11/Type1" does not exist.
[  1548.950]    Entry deleted from font path.
[  1548.951] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[  1548.951]    Entry deleted from font path.
[  1548.951] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[  1548.951]    Entry deleted from font path.
[  1548.951] (==) FontPath set to:
        /usr/share/fonts/X11/misc,
        built-ins
[  1548.951] (==) ModulePath set to "/usr/lib/xorg/modules"
[  1548.951] (II) The server relies on udev to provide the list of
input devices.
        If no devices become available, reconfigure udev or disable 
AutoAddDevices.
[  1548.951] (II) Loader magic: 0x80280720
[  1548.951] (II) Module ABI versions:
[  1548.951]    X.Org ANSI C Emulation: 0.4
[  1548.951]    X.Org Video Driver: 23.0
[  1548.951]    X.Org XInput driver : 24.1
[  1548.951]    X.Org Server Extension : 10.0
[  1548.954] (II) systemd-logind: took control of session
/org/freedesktop/login1/session/_35
[  1548.955] (II) xfree86: Adding drm device (/dev/dri/card0)
[  1548.956] (II) systemd-logind: got fd for /dev/dri/card0 226:0 fd 11 paused 0
[  1548.958] (--) PCI:*(0:0:2:0) 8086:2572:17aa:300a rev 2, Mem @
0xe8000000/134217728, 0xf0200000/524288, I/O @ 0x0000c000/8, BIOS @
0x????????/131072
[  1548.958] (--) PCI: (0:1:1:0) 109e:0350:0000:0000 rev 18, Mem @
0xf0100000/4096
[  1548.958] (II) LoadModule: "glx"
[  1548.958] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[  1548.961] (II) Module glx: vendor="X.Org Foundation"
[  1548.961]    compiled for 1.19.2, module version = 1.0.0
[  1548.961]    ABI class: X.Org Server Extension, version 10.0
[  1548.961] (==) Matched intel as autoconfigured driver 0
[  1548.961] (==) Matched intel as autoconfigured driver 1
[  1548.961] (==) Matched modesetting as autoconfigured driver 2
[  1548.961] (==) Matched fbdev as autoconfigured driver 3
[  1548.961] (==) Matched vesa as autoconfigured driver 4
[  1548.961] (==) Assigned the driver to the xf86ConfigLayout
[  1548.961] (II) LoadModule: "intel"
[  1548.961] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so
[  1548.962] (II) Module intel: vendor="X.Org Foundation"
[  1548.962]    compiled for 1.19.0, module version = 2.99.917
[  1548.962]    Module class: X.Org Video Driver
[  1548.962]    ABI class: X.Org Video Driver, version 23.0
[  1548.962] (II) LoadModule: "modesetting"
[  1548.962] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[  1548.962] (II) Module modesetting: vendor="X.Org Foundation"
[  1548.962]    compiled for 1.19.2, module version = 1.19.2
[  1548.962]    Module class: X.Org Video Driver
[  1548.962]    ABI class: X.Org Video Driver, version 23.0
[  1548.962] (II) LoadModule: "fbdev"
[  1548.962] (WW) Warning, couldn't open module fbdev
[  1548.962] (II) UnloadModule: "fbdev"
[  1548.963] (II) Unloading fbdev
[  1548.963] (EE) Failed to load module "fbdev" (module does not exist, 0)
[  1548.963] (II) LoadModule: "vesa"
[  1548.963] (WW) Warning, couldn't open module vesa
[  1548.963] (II) UnloadModule: "vesa"
[  1548.963] (II) Unloading vesa
[  1548.963] (EE) Failed to load module "vesa" (module does not exist, 0)
[  1548.963] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
        i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G,
        915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,
        Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33,
        GM45, 4 Series, G45/G43, Q45/Q43, G41, B43
[  1548.964] (II) intel: Driver for Intel(R) HD Graphics
[  1548.964] (II) intel: Driver for Intel(R) Iris(TM) Graphics
[  1548.964] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics
[  1548.964] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[  1548.964] (EE)
Fatal server error:
[  1548.964] (EE) parse_vt_settings: Cannot open /dev/tty0 (Permission denied)
[  1548.964] (EE)
[  1548.964] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
for help.
[  1548.964] (EE) Please also check the log file at
"/home/zhou/.local/share/xorg/Xorg.0.log" for additional information.
[  1548.964] (EE)
[  1548.964] (WW) xf86CloseConsole: KDSETMODE failed: Bad file descriptor
[  1548.964] (WW) xf86CloseConsole: VT_GETMODE failed: Bad file descriptor
[  1549.010] (EE) Server terminated with error (1). Closing log file.



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