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Thread: black laptop screen on restart after kernel update

  1. #1
    Join Date
    Mar 2013
    Beans
    2

    black laptop screen on restart after kernel update

    I am running 12.04 LTS as a dual boot with Windows 7 on a Toshiba Satellite laptop

    As part of the regular package update that I ran last night the kernel was updated to 3.2.0-39-generic and I was asked to reboot. On doing this I was presented with a black screen, i.e. no Toshiba splash, no GRUB menu, although it sounded as though boot up was happening as I heard the Ubuntu sound.


    At first I thought the laptop screen was just totally black, but on close inspection there is a very very low brightness - but too low to be functional. I plugged in an external monitor and the display on the external monitor works perfectly.

    This is what I have tried so far to get the laptop screen working:

    Changing the screen brightness settings. This doesn't do anything to change the virtually black laptop screen.

    Following advice from http://askubuntu.com/questions/16819...ng-qx412-s01au I changed the GRUB config file from:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

    to:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

    and then to:
    GRUB_CMDLINE_LINUX_DEFAULT="quite splash acpi_osi="

    After each of these changes I did sudo update-grub and rebooted. No change.

    I installed xbacklight and set backlight brightness to 100 but with no affect on laptop screen.

    Booting up from GRUB into Windows 7 and previous kernels has no effect. It has crossed my mind that this could be a hardware problem but seems unlikely given that it occured initially after a package/kernel upgrade and reboot.

    Any ideas?

  2. #2
    Join Date
    May 2008
    Location
    UK
    Beans
    15
    Distro
    Ubuntu 11.04 Natty Narwhal

    Re: black laptop screen on restart after kernel update

    Hi

    You might like to try http://sourceforge.net/p/boot-repair/home/Home/ , this solved issues with a black screen whenever i have upgraded Ubuntu.

    Burn image to disk , reboot into boot-repair , choose 32bits session or 64 whichever the case may be , choose recommended repair and then click on advanced options and tick ''uncomment GRUB_GFXMODE(solves out of range error)

    Hope this helps

  3. #3
    Join Date
    Mar 2013
    Beans
    2

    Re: black laptop screen on restart after kernel update

    Thanks Intensetux. I tried using the boot-repair as you suggest but there is no change to the problem of the brightness of the laptop screen. Any other suggestions? I am at my wits end.

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