The screen of my Alienware M17X remains black when I power it on. When it starts, there is light from the screen but it remains black. I can not see the Alienware logo, the BIOS, or GRUB, yet it had been previously working fine. I dual boot with Windows 7 and Debian 8.
The output of
$ lspci | grep -E "VGA|3D" is:
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) 01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GTX 660M] (rev a1)
I guess it is a problem with the graphics card. I connected a screen using a VGA cable and it worked fine. The computer detected the two screens (the external one which is working and the internal one which is not).
The output of
# lspci -v -s 00:02.0 was first:
01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GTX 660M] (rev ff) (prog-if ff) !!! Unknown header type 7f
# modprobe nvidia and then I rerun the lspci command:
01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GTX 660M] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Dell Device 0551 Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at d0000000 (32-bit, non-prefetchable) [size=16M] Memory at a0000000 (64-bit, prefetchable) [size=256M] Memory at b0000000 (64-bit, prefetchable) [size=32M] I/O ports at 3000 [size=128] Expansion ROM at d1000000 [disabled] [size=512K] Capabilities:  Power Management version 3 Capabilities:  MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities:  Express Endpoint, MSI 00 Capabilities: [b4] Vendor Specific Information: Len=14 <?> Capabilities:  Virtual Channel Capabilities:  Power Budgeting <?> Capabilities:  Vendor Specific Information: ID=0001 Rev=1 Len=024 <?> Capabilities:  #19 Kernel driver in use: nvidia
Before I modprobe nvidia,
sudo lshw -c video detected the intel chipset only. Now, it detects both:
*-display description: VGA compatible controller produit: GK107M [GeForce GTX 660M] fabriquant: NVIDIA Corporation identifiant matériel: 0 information bus: pci@0000:01:00.0 version: a1 bits: 64 bits horloge: 33MHz fonctionnalités: pm msi pciexpress vga_controller bus_master cap_list rom configuration: driver=nvidia latency=0 ressources: irq:16 mémoire:d0000000-d0ffffff mémoire:a0000000-afffffff mémoire:b0000000-b1ffffff portE/S:3000(taille=128) mémoire:d1000000-d107ffff *-display description: VGA compatible controller produit: 3rd Gen Core processor Graphics Controller fabriquant: Intel Corporation identifiant matériel: 2 information bus: pci@0000:00:02.0 version: 09 bits: 64 bits horloge: 33MHz fonctionnalités: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 ressources: irq:30 mémoire:d2000000-d23fffff mémoire:c0000000-cfffffff portE/S:4000(taille=64)
However, the screen remains black. I have an issue of modprobe bad line since a while but it was not causing any issue with the screen before. I tried the built-in Self-test (BIST) and all the colors are displayed. After the first time, I could successfully boot but it crashed while I was using it. Then the screen displayed no video like before. The computer is four years old. I don't know if it is the LCD screen or the graphics card which is a problem.