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 !! :-) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/765438 Title: On startup, the backlight is off on laptop To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/765438/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
