Description:

can't start x using nvidia driver & nvidia-libgl

Additional info:
* package version(s)
376.27-1

* config and/or log files etc.
[ 72.944] (--) Log file renamed from "/var/log/Xorg.pid-15113.log" to "/var/log/Xorg.0.log"
[ 72.944]
X.Org X Server 1.18.3
Release Date: 2016-04-04
[ 72.944] X Protocol Version 11, Revision 0
[ 72.944] Build Operating System: Linux 4.5.1-1-ARCH x86_64
[ 72.944] Current Operating System: Linux aj 4.6.3-1-ARCH #1 SMP PREEMPT Fri Jun 24 21:19:13 CEST 2016 x86_64
[ 72.944] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-linux root=UUID=9c9222ae-7104-42e4-86ed-93d464b98da5 rw quiet rcutree.rcu_idle_gp_delay=1
[ 72.944] Build Date: 03 June 2016 07:28:24AM
[ 72.944]
[ 72.944] Current version of pixman: 0.34.0
[ 72.944] Before reporting problems, check [url]http://wiki.x.org[/url]
to make sure that you have the latest version.
[ 72.944] Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 72.944] (==) Log file: "/var/log/Xorg.0.log", Time: Fri Jul 1 03:12:45 2016
[ 72.944] (==) Using config file: "/etc/X11/xorg.conf"
[ 72.944] (==) Using config directory: "/etc/X11/xorg.conf.d"
[ 72.944] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 72.945] (==) No Layout section. Using the first Screen section.
[ 72.945] (==) No screen section available. Using defaults.
[ 72.945] (**) |-->Screen "Default Screen Section" (0)
[ 72.945] (**) | |-->Monitor "<default monitor>"
[ 72.945] (==) No device specified for screen "Default Screen Section".
Using the first device section listed.
[ 72.945] (**) | |-->Device "nvidia"
[ 72.945] (==) No monitor specified for screen "Default Screen Section".
Using a default monitor configuration.
[ 72.945] (==) Automatically adding devices
[ 72.945] (==) Automatically enabling devices
[ 72.945] (==) Automatically adding GPU devices
[ 72.945] (==) Max clients allowed: 256, resource mask: 0x1fffff
[ 72.945] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/100dpi/".
[ 72.945] Entry deleted from font path.
[ 72.945] (Run 'mkfontdir' on "/usr/share/fonts/100dpi/").
[ 72.945] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/75dpi/".
[ 72.945] Entry deleted from font path.
[ 72.945] (Run 'mkfontdir' on "/usr/share/fonts/75dpi/").
[ 72.945] (==) FontPath set to:
/usr/share/fonts/misc/,
/usr/share/fonts/TTF/,
/usr/share/fonts/OTF/,
/usr/share/fonts/Type1/
[ 72.945] (==) ModulePath set to "/usr/lib/xorg/modules"
[ 72.945] (II) The server relies on udev to provide the list of input devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.
[ 72.945] (II) Loader magic: 0x821d20
[ 72.945] (II) Module ABI versions:
[ 72.945] X.Org ANSI C Emulation: 0.4
[ 72.945] X.Org Video Driver: 20.0
[ 72.945] X.Org XInput driver : 22.1
[ 72.945] X.Org Server Extension : 9.0
[ 72.945] (++) using VT number 1

[ 72.946] (II) systemd-logind: took control of session /org/freedesktop/login1/session/c504
[ 72.947] (II) xfree86: Adding drm device (/dev/dri/card0)
[ 72.947] (II) systemd-logind: got fd for /dev/dri/card0 226:0 fd 9 paused 0
[ 72.947] (II) xfree86: Adding drm device (/dev/dri/card1)
[ 72.947] (II) systemd-logind: got fd for /dev/dri/card1 226:1 fd 10 paused 0
[ 72.948] (--) PCI:*(0:0:2:0) 8086:1916:1043:1b1d rev 7, Mem @ 0xdd000000/16777216, 0xb0000000/268435456, I/O @ 0x0000f000/64, BIOS @ 0x????????/131072
[ 72.948] (--) PCI: (0:1:0:0) 10de:1347:1043:1b1d rev 162, Mem @ 0xde000000/16777216, 0xc0000000/268435456, 0xd0000000/33554432, I/O @ 0x0000e000/128, BIOS @ 0x????????/524288
[ 72.949] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
[ 72.949] (II) "glx" will be loaded by default.
[ 72.949] (II) LoadModule: "modesetting"
[ 72.949] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[ 72.949] (II) Module modesetting: vendor="X.Org Foundation"
[ 72.949] compiled for 1.18.3, module version = 1.18.3
[ 72.949] Module class: X.Org Video Driver
[ 72.949] ABI class: X.Org Video Driver, version 20.0
[ 72.949] (II) LoadModule: "glx"
[ 72.949] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 72.952] (II) Module glx: vendor="NVIDIA Corporation"
[ 72.952] compiled for 4.0.2, module version = 1.0.0
[ 72.952] Module class: X.Org Server Extension
[ 72.952] (II) NVIDIA GLX Module 367.27 Thu Jun 9 18:19:55 PDT 2016
[ 72.952] (II) LoadModule: "nvidia"
[ 72.952] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
[ 72.952] (II) Module nvidia: vendor="NVIDIA Corporation"
[ 72.952] compiled for 4.0.2, module version = 1.0.0
[ 72.952] Module class: X.Org Video Driver
[ 72.952] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 72.952] (II) NVIDIA dlloader X Driver 367.27 Thu Jun 9 17:57:30 PDT 2016
[ 72.952] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[ 72.952] (II) modeset(G0): using drv /dev/dri/card0
[ 72.952] (II) systemd-logind: releasing fd for 226:1
[ 72.952] (EE) No devices detected.
[ 72.952] (EE)
Fatal server error:
[ 72.952] (EE) no screens found(EE)
[ 72.952] (EE)
Please consult the The X.Org Foundation support
at [url]http://wiki.x.org[/url]
for help.
[ 72.952] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 72.952] (EE)

Steps to reproduce:
install nvidia driver on 940m