Linux

  1. Bug #765438
  2. Comment #112

Comment 112 for bug 765438

Revision history for this message
sma (m-0622) wrote : Re: On startup, the backlight is off on laptop

Notebook Acer TravelMate 5735Z-452G32MNSS

1) Ubuntu 12.10 (Quantal Queezal):
The parameter i915.invert_brightness=1 fixes the bug! :-)

Step-by-step - beginning from installation:
- Boot with the Ubuntu Live-CD or Live-USB-Stick.
- When the display becomes purple press CursorLeft or CursorRight. You see the menu.
- Choose your language and press F6, then press Esc.
- Put the cursor to the end of the line (after --) and enter: i915.invert_brightness=1
- Start the installation. At the end of the installation restart.
- When the Notebook starts to boot again press Shift and hold the key unless the menu of GRUB appears.
- Press the key e (e for edit).
- Put the cursor after 'quiet splash', and enter after a blank: i915.invert_brightness=1 (Note: looks like: .... quiet splash i915.invert_brightness=1). Note: On my Laptop at this time the keyboard has the US-layout, not my common layout!
- Press F10 to boot.
- Open a terminal and enter: gksu gedit /etc/default/grub
- Replace the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash“ by this line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor i915.invert_brightness=1"
- Save the file.
- In the terminal enter: sudo update-grub
- After restarting my Acer TravelMate 5735Z works perfekt. It boots into a bright display. Also after waking up from hibernate and standby the display is bright. :-))

2) Ubuntu 12.04 LTS (Precise Pangolin):
The parameter i915.invert_brightness=1 doesn't work. But a workaround exists, that has the same result! :-)

Step-by-step - beginning from installation:
- Boot with the Ubuntu Live-CD or Live-USB-Stick.
- When the display becomes purple press CursorLeft or CursorRight. You see the menu.
- Choose your language and press F6, then press Esc.
- Put the cursor to the end of the line (after --) and enter: acpi_osi=Linux acpi_backlight=vendor (Note: this is necessary to turn on brightness after booting by using the keys FN+CursorRight or Fn+CursorLeft).
- Start booting (Option 'Testing Ubuntu without installation'). You will boot into a black screen. Press FN+CursorRight or Fn+CursorLeft to turn on brightness. Start the installation of Ubuntu using the icon on the desktop. At the end of the installation restart.
- When the Notebook starts to boot again press Shift and hold the key unless the menu of GRUB appears.
- Press the key e (e for edit).
- Put the cursor after 'quiet splash', and enter after a blank: acpi_osi=Linux acpi_backlight=vendor (Note: looks like: .... quiet splash acpi_osi=Linux acpi_backlight=vendor). Note: On my Laptop at this time the keyboard has the US-layout, not my common layout!
- Press F10 to boot.
- Open a terminal and enter: gksu gedit /etc/default/grub
- Replace the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash“ by this line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
- Save the file.
- In the terminal enter: sudo update-grub
- In the terminal enter: gksu gedit /etc/rc.local
- Above the line exit 0 enter: echo "1" > /sys/class/backlight/intel_backlight/brightness
- Save the file.
- After restarting my Acer TravelMate 5735Z works perfekt. It boots into a bright display. Also after waking up from hibernate and standby the display is bright. :-))
- Only one minor problem exits: In the case I use FN+CursorRight or Fn+CursorLeft to adjust the brightness, after waking up from hibernate or standby the notebook shows a black screen. So I have to press FN+CursorRight or Fn+CursorLeft once again to turn on brightness. After restart, everything works fine again.

Good luck !! :-)