Depuis plusieurs semaines, mon serveur X refuse de se lancer. Mon installation était vieille et je voulais agencer mes partitions différemment, alors j'ai formaté en utilisant le dernier ISO en date, espérant par la même occasion que le problème serait fixé. Et là surprise, exactement la même chose : X refuse de se lancer, écran noir, ctrl+alt+backspace inefficace... Même pas le temps de voir le logo!
Le problème est apparu pour la première fois lorsque j'ai installé un gros paquet de mises à jour début aout, puis j'ai rebooté, puis écran noir

J'ai essayé plusieurs xorg.conf, ça ne change rien. Actuellement, ma carte graphique (une FX 570M) utilise les drivers nvidia 185.18.31-1.
Serait-ce du au driver nvidia qui marcherait visiblement mal dans sa dernière version? (et donc, lors de ma MàJ de début aout, j'aurais installé la dernière version, ce qui aurait provoqué le bug?)
J'ai aussi tenté de faire un "startx & sleep 10; killall X", rien à faire l'écran reste noir

Si ça peut aider, voici les derniers logs de X (qui ne comporte pourtant aucun EE...) :
X.Org X Server 1.6.3
Release Date: 2009-7-31
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.30-ARCH x86_64
Current Operating System: Linux Nyx 2.6.30-ARCH #1 SMP PREEMPT Mon Aug 17 16:06:45 CEST 2009 x86_64
Build Date: 14 August 2009 11:20:44AM
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: Sat Aug 22 17:48:19 2009
(++) Using config file: "/etc/X11/xorg.conf"
(==) No Layout section. Using the first Screen section.
(**) |-->Screen "Screen0" (0)
(**) | |-->Monitor "<default monitor>"
(==) No device specified for screen "Screen0".
Using the first device section listed.
(**) | |-->Device "Device0"
(==) No monitor specified for screen "Screen0".
Using a default monitor configuration.
(==) Automatically adding devices
(==) Automatically enabling devices
(WW) The directory "/usr/share/fonts/TTF" does not exist.
Entry deleted from font path.
(WW) The directory "/usr/share/fonts/Type1" does not exist.
Entry deleted from font path.
(==) FontPath set to:
/usr/share/fonts/misc,
/usr/share/fonts/100dpi:unscaled,
/usr/share/fonts/75dpi:unscaled,
built-ins
(==) ModulePath set to "/usr/lib/xorg/modules"
(II) Cannot locate a core pointer device.
(II) Cannot locate a core keyboard device.
(II) The server relies on HAL to provide the list of input devices.
If no devices become available, reconfigure HAL or disable AllowEmptyInput.
(II) Loader magic: 0x74c0
(II) Module ABI versions:
X.Org ANSI C Emulation: 0.4
X.Org Video Driver: 5.0
X.Org XInput driver : 4.0
X.Org Server Extension : 2.0
(II) Loader running on linux
(--) using VT number 7
(--) PCI:*(0:1:0:0) 10de:040c:17aa:20d9 nVidia Corporation Quadro FX 570M rev 161, Mem @ 0xd2000000/16777216, 0xe0000000/268435456, 0xd0000000/33554432, I/O @ 0x00002000/128
(WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
(II) No APM support in BIOS or kernel
(II) System resource ranges:
[0] -1 0 0xffffffff - 0xffffffff (0x1) MX
[1] -1 0 0x000f0000 - 0x000fffff (0x10000) MX
[2] -1 0 0x000c0000 - 0x000effff (0x30000) MX
[3] -1 0 0x00000000 - 0x0009ffff (0xa0000) MX
[4] -1 0 0x0000ffff - 0x0000ffff (0x1) IX
[5] -1 0 0x00000000 - 0x00000000 (0x1) IX
(II) LoadModule: "extmod"
(II) Loading /usr/lib/xorg/modules/extensions//libextmod.so
(II) Module extmod: vendor="X.Org Foundation"
compiled for 1.6.3, module version = 1.0.0
Module class: X.Org Server Extension
ABI class: X.Org Server Extension, version 2.0
(II) Loading extension MIT-SCREEN-SAVER
(II) Loading extension XFree86-VidModeExtension
(II) Loading extension XFree86-DGA
(II) Loading extension DPMS
(II) Loading extension XVideo
(II) Loading extension XVideo-MotionCompensation
(II) Loading extension X-Resource
(II) LoadModule: "dbe"
(II) Loading /usr/lib/xorg/modules/extensions//libdbe.so
(II) Module dbe: vendor="X.Org Foundation"
compiled for 1.6.3, module version = 1.0.0
Module class: X.Org Server Extension
ABI class: X.Org Server Extension, version 2.0
(II) Loading extension DOUBLE-BUFFER
(II) LoadModule: "glx"
(II) Loading /usr/lib/xorg/modules/extensions//libglx.so
(II) Module glx: vendor="NVIDIA Corporation"
compiled for 4.0.2, module version = 1.0.0
Module class: X.Org Server Extension
(II) NVIDIA GLX Module 185.18.31 Tue Jul 28 19:34:01 PDT 2009
(II) Loading extension GLX
(II) LoadModule: "record"
(II) Loading /usr/lib/xorg/modules/extensions//librecord.so
(II) Module record: vendor="X.Org Foundation"
compiled for 1.6.3, module version = 1.13.0
Module class: X.Org Server Extension
ABI class: X.Org Server Extension, version 2.0
(II) Loading extension RECORD
(II) LoadModule: "dri"
(II) Loading /usr/lib/xorg/modules/extensions//libdri.so
(II) Module dri: vendor="X.Org Foundation"
compiled for 1.6.3, module version = 1.0.0
ABI class: X.Org Server Extension, version 2.0
(II) Loading extension XFree86-DRI
(II) LoadModule: "dri2"
(II) Loading /usr/lib/xorg/modules/extensions//libdri2.so
(II) Module dri2: vendor="X.Org Foundation"
compiled for 1.6.3, module version = 1.1.0
ABI class: X.Org Server Extension, version 2.0
(II) Loading extension DRI2
(II) LoadModule: "nvidia"
(II) Loading /usr/lib/xorg/modules/drivers//nvidia_drv.so
(II) Module nvidia: vendor="NVIDIA Corporation"
compiled for 4.0.2, module version = 1.0.0
Module class: X.Org Video Driver
(II) NVIDIA dlloader X Driver 185.18.31 Tue Jul 28 18:13:23 PDT 2009
(II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
(II) Primary Device is: PCI 01@00:00:0
(II) Loading sub module "fb"
(II) LoadModule: "fb"
(II) Loading /usr/lib/xorg/modules//libfb.so
(II) Module fb: vendor="X.Org Foundation"
compiled for 1.6.3, module version = 1.0.0
ABI class: X.Org ANSI C Emulation, version 0.4
(II) Loading sub module "wfb"
(II) LoadModule: "wfb"
(II) Loading /usr/lib/xorg/modules//libwfb.so
(II) Module wfb: vendor="X.Org Foundation"
compiled for 1.6.3, module version = 1.0.0
ABI class: X.Org ANSI C Emulation, version 0.4
(II) Loading sub module "ramdac"
(II) LoadModule: "ramdac"
(II) Module "ramdac" already built-in
(II) resource ranges after probing:
[0] -1 0 0xffffffff - 0xffffffff (0x1) MX
[1] -1 0 0x000f0000 - 0x000fffff (0x10000) MX
[2] -1 0 0x000c0000 - 0x000effff (0x30000) MX
[3] -1 0 0x00000000 - 0x0009ffff (0xa0000) MX
[4] -1 0 0x0000ffff - 0x0000ffff (0x1) IX[B]
[5] -1 0 0x00000000 - 0x00000000 (0x1) IX[B]
(II) NVIDIA(0): Creating default Display subsection in Screen section
"Screen0" for depth/fbbpp 24/32
(==) NVIDIA(0): Depth 24, (==) framebuffer bpp 32
(==) NVIDIA(0): RGB weight 888
(==) NVIDIA(0): Default visual is TrueColor
(==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
(**) NVIDIA(0): Enabling RENDER acceleration
(II) NVIDIA(0): Support for GLX with the Damage and Composite X extensions is
(II) NVIDIA(0): enabled.
(II) NVIDIA(0): NVIDIA GPU Quadro FX 570M (G84GL) at PCI:1:0:0 (GPU-0)
(--) NVIDIA(0): Memory: 524288 kBytes
(--) NVIDIA(0): VideoBIOS: 60.84.51.00.00
(II) NVIDIA(0): Detected PCI Express Link width: 16X
(--) NVIDIA(0): Interlaced video modes are supported on this GPU
(--) NVIDIA(0): Connected display device(s) on Quadro FX 570M at PCI:1:0:0:
(--) NVIDIA(0): LEN (DFP-0)
(--) NVIDIA(0): LEN (DFP-0): 330.0 MHz maximum pixel clock
(--) NVIDIA(0): LEN (DFP-0): Internal Dual Link LVDS
(WW) NVIDIA(0): The EDID for LEN (DFP-0) contradicts itself: mode "1920x1200"
(WW) NVIDIA(0): is specified in the EDID; however, the EDID's valid
(WW) NVIDIA(0): HorizSync range (60.815-72.961 kHz) would exclude this
(WW) NVIDIA(0): mode's HorizSync (48.6 kHz); ignoring HorizSync check for
(WW) NVIDIA(0): mode "1920x1200".
(WW) NVIDIA(0): The EDID for LEN (DFP-0) contradicts itself: mode "1920x1200"
(WW) NVIDIA(0): is specified in the EDID; however, the EDID's valid
(WW) NVIDIA(0): HorizSync range (60.815-72.961 kHz) would exclude this
(WW) NVIDIA(0): mode's HorizSync (48.6 kHz); ignoring HorizSync check for
(WW) NVIDIA(0): mode "1920x1200".
(II) NVIDIA(0): Assigned Display Device: DFP-0
(==) NVIDIA(0):
(==) NVIDIA(0): No modes were requested; the default mode "nvidia-auto-select"
(==) NVIDIA(0): will be used as the requested mode.
(==) NVIDIA(0):
(II) NVIDIA(0): Validated modes:
(II) NVIDIA(0): "nvidia-auto-select"
(II) NVIDIA(0): Virtual screen size determined to be 1920 x 1200
(--) NVIDIA(0): DPI set to (147, 145); computed from "UseEdidDpi" X config
(--) NVIDIA(0): option
(WW) NVIDIA(0): UBB is incompatible with the Composite extension. Disabling
(WW) NVIDIA(0): UBB.
(==) NVIDIA(0): Enabling 32-bit ARGB GLX visuals.
(--) Depth 24 pixmap format is 32 bpp
(II) do I need RAC? No, I don't.
(II) resource ranges after preInit:
[0] -1 0 0xffffffff - 0xffffffff (0x1) MX[B]
[1] -1 0 0x000f0000 - 0x000fffff (0x10000) MX[B]
[2] -1 0 0x000c0000 - 0x000effff (0x30000) MX[B]
[3] -1 0 0x00000000 - 0x0009ffff (0xa0000) MX[B]
[4] -1 0 0x0000ffff - 0x0000ffff (0x1) IX[B]
[5] -1 0 0x00000000 - 0x00000000 (0x1) IX[B]
(II) NVIDIA(0): Initialized GPU GART.
(II) NVIDIA(0): ACPI: failed to connect to the ACPI event daemon; the daemon
(II) NVIDIA(0): may not be running or the "AcpidSocketPath" X
(II) NVIDIA(0): configuration option may not be set correctly. When the
(II) NVIDIA(0): ACPI event daemon is available, the NVIDIA X driver will
(II) NVIDIA(0): try to use it to receive ACPI event notifications. For
(II) NVIDIA(0): details, please see the "ConnectToAcpid" and
(II) NVIDIA(0): "AcpidSocketPath" X configuration options in Appendix B: X
(II) NVIDIA(0): Config Options in the README.
(II) NVIDIA(0): ACPI display change hotkey events enabled: the X server is new
(II) NVIDIA(0): enough to receive ACPI display change hotkey events.
Merci d'avance pour votre aide!