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I recently attempted to dualboot Ubuntu 13.04 with Windows 8 in EFI mode on a Lenovo Ideapad U510. The installation went unhitched, but after restarting, I ran into a couple of problems.

1) The laptop screen will not display anything upon bootup, including the dualboot screen, BIOS, etc. As of this moment, I can boot into Ubuntu just by hitting enter blindly, but I have not been able to boot into Windows 8.

2) The laptop screen remains blank when Ubuntu has fully loaded. Interestingly, it will display everything expected on a second, much larger, external monitor. This essentially renders the portability of a laptop moot.

3) The laptop has an inability to connect to some secured Wi-Fi networks, despite authentication being correct. Attempts to connect are met with the authentication window popping up in regular intervals.

At the moment, I would appreciate it if people could help me fix my problem of not seeing anything upon powering up and entering the invisible boot screen. I would like to keep the dualboot, as I like Ubuntu for its ease of use for developing, but would also like tips as to how to uninstall this dualboot and return to Windows 8, worst comes to worst.

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The second problem might just be screen brightness. I have the same device. On startup it shows the ubuntu boot screen for a moment and then suddenly goes black. But its just the brightness which is somehow initialized to its lowest level, and lowest level means black on this device.

I put the following line in \etc\rc.local, right before exit 0.

cat /sys/class/backlight/acpi_video0/max_brightness > /sys/class/backlight/acpi_video0/brightness

Now the lights go off and immediately on again.

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