bon j’ai trouve une piste assez sérieuse :
# ps aux |grep tty
root 3434 0.0 0.0 2628 1200 tty1 Ss 16:03 0:00 /bin/login --
root 3436 0.0 0.0 1764 508 tty2 Ss+ 16:03 0:00 /sbin/getty 38400 tty2
root 3437 0.0 0.0 1764 504 tty3 Ss+ 16:03 0:00 /sbin/getty 38400 tty3
root 3438 0.0 0.0 1764 504 tty4 Ss+ 16:03 0:00 /sbin/getty 38400 tty4
root 3440 0.0 0.0 1764 504 tty5 Ss+ 16:03 0:00 /sbin/getty 38400 tty5
root 3441 0.0 0.0 1764 508 tty6 Ss+ 16:03 0:00 /sbin/getty 38400 tty6
taz 3455 0.0 0.0 6248 3524 tty1 S 16:03 0:00 -bash
taz 3471 0.0 0.0 4384 1512 tty1 S+ 16:04 0:00 /bin/bash /usr/bin/startx -- :0
taz 3489 0.0 0.0 2864 804 tty1 S+ 16:04 0:00 xinit /home/taz/.xinitrc -- /usr/bin/X :0 -auth /tmp/serverauth.uioZxtzSgC
root 3490 2.8 0.9 47504 40620 tty7 RLs+ 16:04 0:32 /usr/bin/X :0 -auth /tmp/serverauth.uioZxtzSgC
taz 3507 0.1 0.1 11572 6044 tty1 S 16:04 0:01 /usr/bin/fluxbox
root 7136 0.0 0.0 3148 788 pts/0 S+ 16:23 0:00 grep tty
plus de tty1
il y a une commande pour le faire revenir ?
mai si je fait un ctrl +alt F2 sa me plante quand même un écran noire 
meme un reset fait rien 
spci
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
00:01.0 PCI bridge: Intel Corporation Mobile 4 Series Chipset PCI Express Graphics Port (rev 07)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03)
00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03)
00:1c.3 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4 (rev 03)
00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
[b]01:00.0 VGA compatible controller: nVidia Corporation G98 [GeForce 9300M GS] (rev a1)[/b]
06:00.0 System peripheral: JMicron Technology Corp. SD/MMC Host Controller
06:00.2 SD Host controller: JMicron Technology Corp. Standard SD Host Controller
06:00.3 System peripheral: JMicron Technology Corp. MS Host Controller
06:00.4 System peripheral: JMicron Technology Corp. xD Host Controller
07:00.0 Network controller: Intel Corporation Wireless WiFi Link 5100
09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5764M Gigabit Ethernet PCIe (rev 10)
0a:04.0 CardBus bridge: O2 Micro, Inc. OZ601/6912/711E0 CardBus/SmartCardBus Controller (rev 40)
sinon j’ai un truc aux demarrage qui ce voit avec un dmesg
[ 1.164031] PCI: Using ACPI for IRQ routing
[ 1.164031] PCI: Cannot allocate resource region 7 of bridge 0000:00:1c.0
[ 1.164031] PCI: Cannot allocate resource region 8 of bridge 0000:00:1c.0
[ 1.164031] PCI: Cannot allocate resource region 9 of bridge 0000:00:1c.0
[ 1.164031] PCI: Cannot allocate resource region 7 of bridge 0000:00:1c.2
[ 1.164031] PCI: Cannot allocate resource region 8 of bridge 0000:00:1c.2
[ 1.164031] PCI: Cannot allocate resource region 9 of bridge 0000:00:1c.2
[ 1.164031] PCI: Cannot allocate resource region 7 of bridge 0000:00:1c.3
[ 1.164031] PCI: Cannot allocate resource region 8 of bridge 0000:00:1c.3
[ 1.164031] PCI: Cannot allocate resource region 9 of bridge 0000:00:1c.3
[ 1.164031] PCI: Cannot allocate resource region 7 of bridge 0000:00:1c.5
[ 1.164031] PCI: Cannot allocate resource region 8 of bridge 0000:00:1c.5
[ 1.164031] PCI: Cannot allocate resource region 9 of bridge 0000:00:1c.5
[ 1.164031] PCI: Cannot allocate resource region 0 of device 0000:06:00.2
[ 1.164031] PCI: Cannot allocate resource region 0 of device 0000:06:00.3
[ 1.164031] PCI: Cannot allocate resource region 0 of device 0000:06:00.4
je voit pas pourquoi sa M… 
Merci d’avance