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I have a Dell XPS 12 with Intel Graphics. After update to 13.04 my screen stays dark after boot. When I attach an external monitor it works. But it takes several tries to swicht on the internal display of the notebook.

Can anybody help?

  • By tries do you mean you reboots? This might help, although I don't think it answers your question directly. – duxk.gh Apr 27 '13 at 21:50
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Try brighten up the display with Fn+F5. It seems that the backlight is set to 0 during boot.

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  • What if I don't have a Fn key on keyboard? – Radu Rădeanu May 1 '13 at 8:28
  • full solutions is to edit /etc/default/grub and add "acpi_osi=linux acpi_backlight=vendor" so it looks like this: – Uwe K. May 1 '13 at 10:17
  • sorry, pressing Enter sent the comment – Uwe K. May 1 '13 at 10:17
  • ... so it looks like this: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=linux acpi_backlight=vendor" save file and update grub.conf with: sudo update-grub reboot - should work now – Uwe K. May 1 '13 at 10:18
  • Uwe, when I try your boot params my boot fails. Other suggestions? Note the Fn+F5 works. – Ray Jun 2 '13 at 0:47
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Thanks to this cool answer, I found another way to automatically set the screen brightness to a decent level at startup:

In /etc/rc.local, before "exit 0", write the following line:

echo 50 > /sys/class/backlight/acpi_video0/brightness

50 was my personal preference, you can set it to any value from 0 (blank) to 100 (highest)

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