Ubuntu
linux package

  1. Bug #780625
  2. Comment #4

Comment 4 for bug 780625

Revision history for this message
Marco Lackovic (marco-lackovic) wrote :

I had this problem on my HP Folio 13 both on the old Ubuntu 12.10 and the new Ubuntu 13.04.

I have fixed it by editing /etc/default/grub and changing:

GRUB_CMDLINE_LINUX=""

into:

GRUB_CMDLINE_LINUX="acpi_backlight=vendor"

And eventually by running:

sudo update-grub
sudo reboot

During this entire operation the screen was completely dark. In order to see anything I had to put a very bright lamp against the screen.

I don't see how this bug should be a duplicate of bug #568611. This bug is about the screen back-light not working. Bug #568611 is about the screen controls for increasing and reducing brightness not working.