Laptop Backlight not coming on

aovenden · 06-22-2010, 03:45 AM

Hello, I have been given the task of installing CentOS 5.5 on some new Fujitsu Siemens S710 laptops and have the following problem. The OS seems to install without any issues but when it starts up you can see the login prompt just as the backlight is off on the laptop screen. If you were to plug in an external monitor it will work fine and the screen is perfect. The only thing I can think of is if the video drivers need to be updated but I can't seem to fine any Linux ones. It seems to use the Intel mobile HD graphics chipset.

Any one Have any ideas.

Cheers,
Alan.

yooy · 06-22-2010, 05:14 AM

Does backlight work when bios is booting? try with live cd of different distro?

aovenden · 06-22-2010, 05:21 AM

The backlight is on for the post and the start of the boot process. Then it goes off. This is what leads me to believe it is a driver loading.

Unfortunately, I'm stuck with the distro as it is our site standard one,

H_TeXMeX_H · 06-22-2010, 05:28 AM

I think you might need the 'fujitsu-laptop' module, try running 'modprobe fujitsu-laptop', if it doesn't work check the kernel config for:

Code:

  ┌───────────────────────── Fujitsu Laptop Extras ─────────────────────────┐
  │ CONFIG_FUJITSU_LAPTOP:                                                  │  
  │                                                                         │  
  │ This is a driver for laptops built by Fujitsu:                          │  
  │                                                                         │  
  │   * P2xxx/P5xxx/S6xxx/S7xxx series Lifebooks                            │  
  │   * Possibly other Fujitsu laptop models                                │  
  │   * Tested with S6410 and S7020                                         │  
  │                                                                         │  
  │ It adds support for LCD brightness control and some hotkeys.            │  
  │                                                                         │  
  │ If you have a Fujitsu laptop, say Y or M here.                          │  
  │                                                                         │  
  │ Symbol: FUJITSU_LAPTOP [=n]                                             │  
  │ Prompt: Fujitsu Laptop Extras                                           │  
  │   Defined at drivers/platform/x86/Kconfig:70                            │  
  │   Depends on: X86 && X86_PLATFORM_DEVICES && ACPI && INPUT && BACKLIGHT │  
  │   Location:                                                             │  
  │     -> Device Drivers                                                   │  
  │       -> X86 Platform Specific Device Drivers (X86_PLATFORM_DEVICES [=y │