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So im dual booting windows 7 and ubuntu 11.10 using wubi, and when i turn on my computer it takes me to the boot manager screen and i pick ubuntu. After that it takes me to purple screen and askes me which version i want to boot (normal or safe mode) i pick normal. After i pick normal i get another purple screen and then my screen turns off and i cant see anything. Is there a code or command i can out in to keep my screen on/

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What video card is it ? – bodhi.zazen Jan 20 '12 at 22:01
im actually not sure. Its brand new, like new new. Acer Aspire – Jade Jan 21 '12 at 0:51

I encountered this bug several times with different Acer models (mostly Travelmate).

The information here has some good information how to fix this (if it is really this bug):

It deals with editing /etc/default/grub and /etc/rc.local but you should follow these steps after you have installed Ubuntu.

For the installation I found the following workarounds (only one or a combination of both is perhaps needed):

  • When the BIOS messages are displayed, just press the key combination FN + Brightness_Key to turn your screen a little bit darker or brighter. After that the install GUI should show up as expected.
  • Add acpi_osi=Linux acpi_backlight=vendor to the the kernel command line when booting the installer.
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