Hello ;) i installed arch on my second pc and Xorg seem to fail somewhere else :
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(EE) [mi] EQ overflowing. Additional events will be discarded until existing events are processed.
(EE)
(EE) Backtrace:
(EE) 0: /usr/bin/Xorg (xorg_backtrace+0x3d) [0x57f71d]
(EE) 1: /usr/bin/Xorg (mieqEnqueue+0x22b) [0x5615cb]
(EE) 2: /usr/bin/Xorg (QueuePointerEvents+0x52) [0x44da92]
(EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (0x7ff6a169a000+0x57ed) [0x7ff6a169f7ed]
(EE) 4: /usr/bin/Xorg (0x400000+0x73b08) [0x473b08]
(EE) 5: /usr/bin/Xorg (0x400000+0x9c030) [0x49c030]
(EE) 6: /usr/lib/libpthread.so.0 (0x7ff6a6ffb000+0xf830) [0x7ff6a700a830]
(EE) 7: /usr/bin/Xorg (0x400000+0x1838e0) [0x5838e0]
(EE) 8: /usr/lib/libpthread.so.0 (0x7ff6a6ffb000+0xf830) [0x7ff6a700a830]
(EE) 9: /usr/lib/libc.so.6 (ioctl+0x7) [0x7ff6a613b507]
(EE) 10: /usr/lib/libdrm.so.2 (drmIoctl+0x16) [0x7ff6a7ca9586]
(EE) 11: /usr/lib/libdrm.so.2 (drmModeGetConnector+0x101) [0x7ff6a7cae4c1]
(EE) 12: /usr/lib/xorg/modules/drivers/nouveau_drv.so (0x7ff6a4ccc000+0x254f1) [0x7ff6a4cf14f1]
(EE) 13: /usr/bin/Xorg (xf86ProbeOutputModes+0xfb) [0x4a9f9b]
(EE) 14: /usr/bin/Xorg (0x400000+0xb353c) [0x4b353c]
(EE) 15: /usr/bin/Xorg (RRGetInfo+0x88) [0x4f0178]
(EE) 16: /usr/bin/Xorg (0x400000+0xf6e39) [0x4f6e39]
(EE) 17: /usr/bin/Xorg (0x400000+0x3728e) [0x43728e]
(EE) 18: /usr/bin/Xorg (0x400000+0x268b5) [0x4268b5]
(EE) 19: /usr/lib/libc.so.6 (__libc_start_main+0xf5) [0x7ff6a607fbc5]
(EE) 20: /usr/bin/Xorg (0x400000+0x26bfd) [0x426bfd]
(EE)
(EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
(EE) [mi] mieq is *NOT* the cause. It is a victim.
[ 26.537] [mi] Increasing EQ size to 512 to prevent dropped events.
[ 26.537] [mi] EQ processing has resumed after 25 dropped events.
[ 26.537] [mi] This may be caused my a misbehaving driver monopolizing the server's resources.
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my spec info :

00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b5)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b5)
00:1c.4 PCI bridge: Intel Corporation 82801 PCI Bridge (rev b5)
00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 (rev b5)
00:1c.6 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 7 (rev b5)
00:1c.7 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 8 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation H67 Express Chipset Family LPC Controller (rev 05)
00:1f.2 IDE interface: Intel Corporation 6 Series/C200 Series Chipset Family 4 port SATA IDE Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
00:1f.5 IDE interface: Intel Corporation 6 Series/C200 Series Chipset Family 2 port SATA IDE Controller (rev 05)
01:00.0 VGA compatible controller: NVIDIA Corporation GF110 [GeForce GTX 570 Rev. 2] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GF110 High Definition Audio Controller (rev a1)
05:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge (rev 01)
07:00.0 IDE interface: VIA Technologies, Inc. VT6415 PATA IDE Host Controller
08:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168 PCI Express Gigabit Ethernet controller (rev 06)
09:00.0 USB controller: ASMedia Technology Inc. ASM1042 SuperSpeed USB Host Controller