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?
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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)