Bug#627372: Console turns black during boot.
Additional info: the screen needs to be turned on again after lid closure or screensaver timeout.
It seems to be achieved by creating a file called
/etc/acpi/local/lid.sh.post with the following contents
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#!/bin/sh
# To fix video-intel backlight off on start bug
setpci -s 00:02.0 F4.B=00
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and chmod +x /etc/acpi/local/lid.sh.post
Alan
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