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I installed Ubuntu 13.04 on my Y580, and I added the acpi_backlight=vendor option to the bootloader. The OS boots without the black screen now, but I can't adjust the brightness with Fn+Up/Down keys. Is there any solution for this?

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Reset to default
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Alright solved this on my own.

  1. Open file /etc/default/grub.
  2. Find a line GRUB_CMDLINE_LINUX="" (there might be something between the quotes).
  3. Add acpi_osi=Linux between the quotes, so the result might be something like GRUB_CMDLINE_LINUX="acpi_osi=Linux"
  4. Run sudo update-grub
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