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Thread: screen Brightness ste to 0% upon log in in HP G62

  1. #1
    Join Date
    Oct 2011
    Beans
    3

    Unhappy screen Brightness ste to 0% upon log in in HP G62

    hello everybody,
    i have HP G62 a20SE Notebook with double graphic cards: Intel and ATI
    the ATI does not work but this is not a big problem for me now
    the main problem is that when the Ubuntu 12.04 starts up and reaches the login screen the brightness goes off and i can feel that everything is just working and i can't see anything anymore!
    but when i login to the safe mode settings (recovery mode) it work fine and i notice that the brightness is set to 0% and although i keep changing it it still goes back every time to 0%

    could somebody please help me?

    thanks in advance

  2. #2
    Join Date
    Oct 2011
    Beans
    3

    Smile Re: screen Brightness ste to 0% upon log in in HP G62

    Solved:


    a friend has helped me to solve this

    so i want to share the solution with others that might have the same issue:

    type in the terminal:

    sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i
    then type:

    sudo update-grub

    then type:

    sudo reboot



    hopefully it will work

    best wishes

  3. #3
    Join Date
    Aug 2005
    Location
    Northern Michigan USA
    Beans
    2,108
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: screen Brightness ste to 0% upon log in in HP G62

    works on HP G72t thank you!!!Can you explain that command I wonder what it does and how
    Last edited by cmcanulty; May 6th, 2012 at 10:46 PM.

  4. #4
    Join Date
    May 2008
    Location
    Bangalore
    Beans
    12
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Smile Re: screen Brightness ste to 0% upon log in in HP G62

    Thanks a lot. It resolved the same issue with HP 630 and Ubuntu 12.04

  5. #5
    Join Date
    Feb 2007
    Location
    United Kingdom
    Beans
    15
    Distro
    Ubuntu 7.10 Gutsy Gibbon

    Re: screen Brightness ste to 0% upon log in in HP G62

    This fixed blank screen at login on my HP G6, thanks for posting back with the solution!

  6. #6
    Join Date
    Aug 2010
    Beans
    16

    Re: screen Brightness ste to 0% upon log in in HP G62

    Worked for me also.Had same problem on HP Pavilion G4. I'm also wondering what exactly that command does.

  7. #7
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 16.04 Xenial Xerus

    Re: screen Brightness ste to 0% upon log in in HP G62

    acpi_osi=Linux - sometimes a bios will disable functionality if Windows is not detected. This command forces it to use all functionality.

    acpi_backlight=vendor - tells the kernel to use a vendor specific acpi driver (e.g.. sony_acpi, thinkpad_acpi) instead of the default video module. Helps in fixing backlight issues in some cases.

  8. #8
    Join Date
    Nov 2008
    Location
    Garland, TX, USA
    Beans
    3
    Distro
    Ubuntu 8.10 Intrepid Ibex

    Re: screen Brightness ste to 0% upon log in in HP G62

    Quote Originally Posted by czeem86 View Post
    Solved:


    a friend has helped me to solve this

    so i want to share the solution with others that might have the same issue:

    type in the terminal:

    sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i
    then type:

    sudo update-grub

    then type:

    sudo reboot



    hopefully it will work

    best wishes


    Thank you. This worked for HP 630 laptop. Running Ubuntu 12.04

  9. #9
    Join Date
    Feb 2013
    Beans
    1

    Re: screen Brightness ste to 0% upon log in in HP G62

    Quote Originally Posted by czeem86 View Post
    Solved:


    a friend has helped me to solve this

    so i want to share the solution with others that might have the same issue:

    type in the terminal:

    sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i
    then type:

    sudo update-grub

    then type:

    sudo reboot



    hopefully it will work

    best wishes

    I came across this solution and it worked (kinda). But I do have a problem...

    After applying this solution my laptop now loads at what appears to be 50% screen brightness, which is much better than the default of 0% that I was experiencing before. BUT now I've lost brightness controls all together! It loads at about 50% brightness but stays there. When I go into the brightness settings and try to adjust the brightness I'm able to move the slider but the screen does not change brightness levels, but it used to before I applied the solution.

    Any ideas??

    Ps. I've spent the last couple of house digging through the web for a solution but none of them worked for me. So I'm hoping someone here can help

    Acer One 200 series, Ubuntu 12.04

  10. #10
    Join Date
    Mar 2009
    Beans
    24

    Re: screen Brightness ste to 0% upon log in in HP G62

    Quote Originally Posted by czeem86 View Post
    Solved:


    a friend has helped me to solve this

    so i want to share the solution with others that might have the same issue:

    type in the terminal:

    sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i
    then type:

    sudo update-grub

    then type:

    sudo reboot



    hopefully it will work

    best wishes
    This worked for me on HP dv6 3032tx running 12.04.2 64 bit with Kernel Linux 3.5.0-27-generic.

    Thank you.

    But now the brightness keys don't work.

    However that doesn't matter as I always use it at max brightness
    Last edited by AshNova; April 30th, 2013 at 10:58 AM. Reason: more info

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